04 Program flow instructions

After turning ON the coil of the timer, if the timer whose coil is ON is jumped by the CJ(P) instruction, the measurement will not be performed normally.

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When the OUT instruction is jumped by the CJ(P) instruction, the scan time will be shorter.

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When the CJ(P) instruction is used to jump backward, the scan time will be longer.

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For the CJ(P) instruction, you can jump to a step smaller than the step number being executed. However, in order to avoid the time limit of the watchdog timer, a method of jumping out of the loop during this period should be considered.

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(((

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[[image:4-2.png||class="img-thumbnail"]]

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(1) While X3 is ON, the loop is executed.

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(2) When X7 is set to ON, it jumps out of the loop.

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)))

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• The device skipped by the CJ(P) instruction does not change.

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(((

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When X2 is ON, jump to the label of P19.

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Even if X2 and X4 turn ON/OFF during CJ instruction execution, Y4 and Y5 will not change.

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[[image:1652258381961-360.png||class="img-thumbnail"]]

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(1) When X2 is ON, jump to the label of P19.

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(2) Even if X2 and X4 turn ON/OFF during CJ instruction execution, Y4 and Y5 will not change.

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)))

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• The label (P□) occupies 1 step.

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[[image:4_html_624bb12f51649fa1.gif||class="img-thumbnail"]]

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The jump instruction can only specify the pointer number in the same program file.

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When jumping to the pointer number within the jump range during jump operation, the program after the jump destination pointer number is executed.

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The label procedure is shown below. When creating a loop program, move the cursor to the left of the bus bar of the Circuit program, and enter the label (P) at the beginning of the loop block.

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[[image:4_html_66293951b95227d4.png||class="img-thumbnail"]]

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It is also possible to program the label at the position where the step number is less than the CJ instruction, but if the scan time becomes more than 200ms (default setting), a watchdog timer error will occur, which requires attention.

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[[image:1652258541371-747.png||class="img-thumbnail"]]

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When the pointer number in the operand is the same and the label is one, the operation is as follows.

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(((

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[[image:1652258590342-123.png||class="img-thumbnail"]]

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(1) When X20 is ON, jump from the CJ instruction of X20 to label P9.

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(2) When X20 is OFF and X21 is ON, jump from the CJ instruction of X21 to label P9.

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If the tag number is reused, it will become an error state.

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[[image:4_html_8fb019c9369040bb.gif||class="img-thumbnail"]]

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SM100 is always ON during the operation of the CPU module, so the usage method shown below will jump unconditionally.

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[[image:4_html_595b9dbff9fae7fc.png||class="img-thumbnail"]]

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The pointer number P63 of LX3V represents the jump to the END instruction. The P63 pointer of LX5V no longer provides this function. If you need to use this function, please use the GOEND instruction.

**Error code**

No error message

**Example**

**(1) The situation to jump after OFF processing**

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After one operation cycle when X023 changes from OFF to ON, the CJ P7 instruction is valid.

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With this method, the output between CJ P7 instruction and mark P7 can be turned off before jumping.

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[[image:4_html_e09161008c47ac30.png||class="img-thumbnail"]]

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**(2) CJ instruction and action of contact coil**

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In the following program example, when X000 is ON, jump from the CJ instruction of the first loop to the mark P8. When X000 is OFF, no jump is performed, but the program is executed in order from step 1, and the CJ instruction in the 11th loop jumps to mark P9. The jumped instruction is not executed.

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(((

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[[image:4_html_e0d34198cc559166.png||class="img-thumbnail"]]

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Double-coil action of Y001 output:

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When X000=OFF, it will act through X001.

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When X000=ON, it will act through X012.

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Even if the program is distinguished by conditional jump, if the same coil (Y000) is programmed twice or more within or outside the jump, it will be treated as normal double coil processing.

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The action of the subroutine timer (T192 to T199):

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After the coil is driven, the action continues even if it jumps, and the output contact also operates.

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If using the high-speed counter (HSC0 to HSC7) operation

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After the coil is driven, the action continues even if it jumps, and the output contact also operates.

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In the above program, if each input changes during the jump, the action of each coil is shown in the following table.

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(% class="table-bordered" %)

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|**Content**|**Contact state before jump**|**Coil action in jump**

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|(% rowspan="2" %)(((

Y,M,S

(Y1, M1, S1)

)))|X1, X2, X3 OFF|Y1, M1, S1 OFF

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|X1, X2, X3 ON|Y1, M1, S1 ON

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|(% rowspan="2" %)(((

168

1ms, 10ms, 100ms timer

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170

(T0)

171

)))|X4 OFF|Timer not working

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|X4 ON|Timer interrupt (continue after X0 OFF)

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|(% rowspan="2" %)(((

Program timer

(T192)

)))|X5 OFF, X6 OFF|Timer not working, but the timer is reset when X13 is ON

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|X5 OFF, X6 ON|Timing continues (contact action after X0 OFF)

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|(% rowspan="2" %)(((

Counter

(C0)

)))|X7 OFF, X10 OFF|{{id name="OLE_LINK160"/}}Counting interrupt, but it is reset when X13 is ON

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|X7 OFF, X10 ON|Count interruption (continue after X0 OFF)

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|(% rowspan="2" %)(((

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Application instructions

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(MOV)

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)))|X11 OFF|(% rowspan="2" %)(((

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Single-cycle application instructions are not executed in the jump

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Multi-cycle application instructions are partially executable (such as high-speed pulse instructions)

)))

|X11 ON

**(3) The relationship between CJ instruction and MC to MCR jump**

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The relationship between the main control instruction and the jump instruction and the action content are as follows.

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However, since the operation of ②, ④, and ⑤ will become complicated, please avoid using them.

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[[image:4_html_679b6b2848540f73.png||class="img-thumbnail"]]

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= {{id name="_Toc23403"/}}**Subroutine jump** =

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== {{id name="_Toc12697"/}}**{{id name="_Toc7169"/}}{{id name="_Toc17038"/}}{{id name="_Toc102982430"/}}CALL/Subroutine call** ==

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When the jump instruction is ON, the program with the specified pointer number in the same program file is executed.

-[CALL (P) (P)]

**Content, range and data type**

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**Device used**

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|(% rowspan="2" %)**Instruction**|(% rowspan="2" %)**Parameter**|(((

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**Offset modification**

)))|(((

**Pulse extension**

)))|**other**

|**[D]**|**XXP**|(((

**Subroutine**

**name**

)))

|CALL|Parameter 1| |●|●

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Parameter 1 can only use the subroutine name.

**Features**

When the CALL(P) instruction is executed, the subroutine of the pointer (P) will be executed. (P) can only write the name of the newly created subprogram, if the program name does not exist, the Circuit program compilation fails.

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[[image:4_html_8924f686c859efa4.png||class="img-thumbnail"]]

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[[image:4_html_60fa80c6a001beb0.gif||class="img-thumbnail"]]

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CALL(P) instructions can be nested up to 32 levels.

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[[image:4_html_29c8e378dfb34066.png||class="img-thumbnail"]]

**✎Note: **

• Multiple CALL(P) instructions can call the same subprogram, but subprograms with the same program name are not allowed.

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• Use program timers in subroutines (the same applies to interrupt programs). This timer counts when the coil instruction or the END instruction is executed. If it reaches the timer setting value, the output contact will act when the coil instruction or END instruction is executed. Generally, the timer only counts when the coil instruction is executed, so if it is used in a subroutine that executes the coil instruction under certain conditions, it will not count.

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• If the 1ms accumulative timer is used in a subroutine (the same in an interrupt program), when it reaches the set value, the output contact will act when the first coil instruction is executed (when the subroutine is executed), so be careful.

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• The devices that are turned on in the subprogram (the same in the interrupt program) will be retained after the program ends. Therefore, these devices should be reset in the main program after the end of the program.

**Error code**

(% class="table-bordered" %)

264

|**Error code**|**Content**

265

|4102H|CALL(P) instruction exceeds 32 levels of nesting structure

**Example**

**(1) New subroutine**

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Project management→Subroutine→ Scan→Right click to create

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[[image:4_html_3d0d21476f0bb476.png||class="img-thumbnail"]]

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**(2) Subroutine call**

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279

[[image:4_html_474fbc929fb22b37.png||class="img-thumbnail"]]

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In the scan program, turn on M10 to call the subroutine SUB0, execute the Circuit program in the subroutine SUB0, until the END instruction of the subroutine is executed, return to the scan program MAIN to execute LD M11.

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**(3) Subroutine nesting**

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[[image:4_html_d7bf03e5f06b73a8.png||class="img-thumbnail"]]

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In the above figure, the subroutine SUB0 is called in the scan program, and the subroutine SUB1 is called in SUB0. So when the scan program M10 is turned on, after the CALL instruction is executed, the subroutine SUB0 will be executed first.And after the CALL instruction of SUB0 is executed, SUB1 will be executed first. After executing the END instruction of SUB1, return to SUB0 for execution. After executing the END instruction of SUB0, return to the scan program MAIN. The program has only 2 levels of nesting, and the number of nesting levels cannot be greater than 32.

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= {{id name="_Toc8930"/}}**Interrupt disable, interrupt enable** =

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== {{id name="_Toc102982432"/}}**DI and EI/Interrupt prohibited and allowed** ==

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The CPU module is usually interrupt disabled. This instruction can make the CPU module into the interrupt enabled state (EI instruction), and then become disabled again (DI instruction).

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• DI: It is forbidden to interrupt program execution.

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• EI: Release the interrupt prohibition state.

-[DI (s)]

-[EI]

**Content, range and data type**

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(% class="table-bordered" %)

(% class="table-bordered" %)

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|(% rowspan="2" %)**Instruction**|(% rowspan="2" %)**Parameter**|**Offset modification**|**Pulse extension**

|**[D]**|**XXP**

|DI|Parameter 1| |●

**{{id name="OLE_LINK161"/}}Features**

* DI

• Even if the execution interrupt condition is triggered in the program, prohibit the interrupt program execution before executing the EI instruction.

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• When the PLC is powered on or after STOP, it will become the state after DI instruction is executed, and the interrupt program cannot be executed.

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• The DI instruction can choose whether to use parameters. When there is no parameter, it means that all interrupt programs are prohibited. With parameters, according to the value in parameter s1, interrupt programs with this priority and lower priority are prohibited.

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• The priority of the interrupt ranges from 0 to 2. The smaller the value, the higher the response priority of the interrupt. That is, the interrupt with priority 0 is the fastest to be responded.

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• If there is no EI instruction before the DI instruction, the DI instruction is invalid.

* EI

• Release the interrupt prohibition state when DI instruction is executed, and allow interrupt program to run.

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• When the EI and DI instructions are not enabled, they all maintain the original enabled or forbidden interrupt program execution status. The currently disabled interrupt priority can be viewed in SD151.

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(% class="table-bordered" %)

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|SD151|Currently disabled interrupt priority|(((

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According to the interrupt prohibition instruction (DI instruction), the interrupt prohibition instruction (DI instruction) below the specified priority, and the interrupt enable instruction (EI instruction), the priority of the interrupt prohibition will be stored.

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0: All priority interrupts are disabled (default);

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1: Priority 1 and 2 interrupts are prohibited;

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2: Priority 2 interrupt is prohibited;

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3: All priority interrupts are allowed

346

)))|R(read only)

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A: Sequence control program

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* DI, EI nested structure

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(((

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(1) Interrupt allowable intervals of all priority levels;

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355

(2) Interrupt forbidden zone below priority 2 (interrupt allowable zone above priority 1);

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357

(3) Interrupt forbidden interval below priority 1 (interrupt allowable interval above priority 0);

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359

(4) Interrupt prohibition zone below priority 2 (interrupt enable zone above priority 1);

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(5) Interrupt allowable intervals of all priority levels;

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(6) EI paired with [DI K1];

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365

(7) EI paired with [DI K2].

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[[image:4_html_a573e3db41c8e5e9.png||class="img-thumbnail"]]

369

)))

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• Interrupts (requests) that occur after the DI instruction are processed after the EI instruction is executed.

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373

• When the DI instruction is executed multiple times and the priority of the argument is specified to be higher than the priority currently being prohibited, interrupts below the priority of the argument are disabled.

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• When the DI instruction is executed multiple times and the priority of the argument is specified to be lower than the priority currently being disabled, the interrupt disable status will not be changed.

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• The nesting of DI instructions can be up to 16 levels.

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379

• The interrupt priority of the interrupt pointer can be set by the properties of the interrupt program. Refer to the description of the interrupt program for details.

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381

• The interrupt prohibition interval when DI instruction and EI instruction are executed is as follows.

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**(1) When the DI instruction is executed multiple times (when the interrupt with priority higher than the currently prohibited interrupt priority is prohibited and specified)**

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386

[[image:4_html_c7e0f7f383d45a1b.png||class="img-thumbnail"]]

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Scan execution type program

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390

1. Interrupt allowable intervals of all priority levels;

391

1. Interrupt prohibition interval below priority 2 (interrupt allowable interval above priority 1);

392

1. Interrupt prohibition section below priority 1 (interrupt enable section above priority 0).

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394

**(2) When the DI instruction is executed multiple times (when the interrupt priority is lower than the currently prohibited interrupt priority is prohibited and specified)**

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[[image:4_html_aad79b3250e8a24b.png||class="img-thumbnail"]]

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Scan execution type program

400

401

1. Interrupt allowable intervals of all priority levels;

402

1. Interrupt prohibited interval below priority 1 (interrupt allowable interval above priority 0);

403

1. The interrupts below priority 1 are already in the disabled state, so the interrupt disable priority will not be changed.

404

405

**(3) When DI instruction is executed through interrupt program**

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408

[[image:4_html_a6d7521496fdd1f8.png||class="img-thumbnail"]]

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410

A: Scan execution type program

B: interrupt program

1. Interrupt allowable intervals of all priority levels;

415

1. Interrupt prohibited interval below priority 3 (interrupt allowable interval above priority 1);

416

1. Interrupt prohibition section below priority 2 (interrupt enable section above priority 0).

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418

**(4) When only DI instructions without arguments are executed**

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421

[[image:4_html_606dbe3d93909e42.png||class="img-thumbnail"]]

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423

A: Scan execution type program

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425

1. Interrupt allowable intervals of all priority levels;

426

1. Interrupt prohibition interval below priority 1 (all interrupt prohibition intervals);

427

1. Because the DI instruction with no argument is set to interrupt prohibition, by executing the EI instruction once, all priority interrupts are set to allow.

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429

**(5) In the case of executing DI instructions with arguments and DI instructions without arguments (when executing in the order of DI instructions with arguments → DI instructions without arguments)**

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432

[[image:4_html_b9b528491258d0e4.png||class="img-thumbnail"]]

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A: Scan execution type program

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1. Interrupt allowable intervals of all priority levels;

437

1. Interrupt prohibition interval below priority 2 (interrupt allowable interval above priority 1);

438

1. Interrupt prohibition section below priority 1 (all interrupt prohibition sections).

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440

**(6) In the case of executing DI instructions with arguments and DI instructions without arguments (in the case of execution in the order of DI instructions with no arguments → DI instructions with arguments)**

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(% style="text-align:center" %)

443

[[image:4_html_622cf36b6bdc523.png||class="img-thumbnail"]]

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{{id name="_Toc11636"/}}A: Scan execution type program

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447

1. Interrupt allowable intervals of all priority levels;

448

1. Interrupt prohibition section below priority 1 (all interrupt prohibition sections).

**Error code**

(% class="table-bordered" %)

453

|**Error code**|**Content**

454

|4085H|(S) read address exceeds the device range

455

|4084H|The data set in (S) exceeds 0 to 2

456

|4185H|When the nesting of DI instructions exceeds 16 levels

**Example**

(((

(% style="text-align:center" %)

462

[[image:4_html_e068a061529263d1.png||class="img-thumbnail"]]

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464

All interrupt programs can be triggered

465

466

Can trigger interrupt programs of priority 0 and priority 1

467

468

Can trigger interrupts with priority 0

469

470

Cannot trigger any interrupts

471

472

Can trigger an interrupt program with a priority of 0

473

474

Can trigger interrupt programs with priority 0 and priority 1

475

)))

476

477

== {{id name="_Toc2335"/}}**SIMASK/Interrupt mask** ==

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479

Set interrupt pointer No. specified in (I) to the execution permission state/execution prohibition state according to the value of (s).

-[SIMASK (I) (s)]

**Content, range and data type**

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485

(% class="table-bordered" %)

**Device used**

(% class="table-bordered" %)

493

|(% rowspan="2" %)**Instruction**|(% rowspan="2" %)**Parameter**|(% colspan="12" %)**Devices**|(((

**Offset**

**modification**

)))|(((

**Pulse**

**extension**

)))

|**KnX**|**KnY**|**KnM**|**KnS**|**T**|**C**|**D**|**R**|**SD**|**K**|**H**|**E**|**[D]**|**XXP**

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|Parameter 2|●|●|●|●|●|●|●|●|●|●|●|●|●|

**Features**

• The interrupt program of the interrupt program name specified in (I) is set to the execution permission state/execution prohibited state according to the data specified in (s).

509

510

• When (s) is 0: Interrupt program execution permission status

511

512

• When (s) is 1, the execution of the interrupt program is prohibited

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514

• Regarding the interrupt program when the power is turned on or after STOP→RUN, all interrupt programs will be executed.

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516

• After setting interrupt prohibition, the prohibition state will be saved even if the instruction is disconnected. To restore it, write 0 to (S), turn on the instruction again, or execute STOP→RUN.

517

518

• The interrupted execution permission status/execution prohibition status will be stored in SM or SD, details as following:

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520

**{{id name="_Toc10728"/}}(1) External interrupt**

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522

(((

523

(% class="table-bordered" %)

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525

|SM352|X0 rising edge interrupt|SM356|X2 rising edge interrupt|SM360|X4 rising edge interrupt|SM364|X6 rising edge interrupt

526

|SM353|X0 falling edge interrupt|SM357|X2 falling edge interrupt|SM361|X4 falling edge interrupt|SM365|X6 falling edge interrupt

527

|SM354|X1 rising edge interrupt|SM358|X3 rising edge interrupt|SM362|X5 rising edge interrupt|SM366|X7 rising edge interrupt

528

|SM355|X1 falling edge interrupt|SM359|X3 falling edge interrupt|SM363|X5 falling edge interrupt|SM367|X7 falling edge interrupt

529

)))

530

531

**(2) Timer interrupt**

532

533

(% class="table-bordered" %)

534

|**Register**|**Content**

535

|SD350 to SD356|Timer interrupt mask, each bit represents an interrupt, a total of 100

536

537

**(3) High-speed counter interrupt**

538

539

(% class="table-bordered" %)

540

|**Register**|**Content**

541

|SD382 to SD388|high-speed counter interrupt mask, each bit represents an interrupt, a total of 100

**Error code**

(% class="table-bordered" %)

546

|**Error code**|**Content**

547

|4084H|Data beyond 0 and 1 is input in the application instruction(s)

548

|4085H|(S) in the read application instruction exceeds the device range

549

|4189H|The SIMASK instruction specifies an interrupt program name that is not set

**Example**

(((

(% style="text-align:center" %)

555

[[image:4_html_fd3e8efafb82209a.png||class="img-thumbnail"]]

556

557

As shown in the figure: when M10 is turned on, the three interrupt programs of INT10, INT91 and INT70 are prohibited from running.

558

)))

559

560

= {{id name="_Toc15333"/}}**Cycle instructions** =

561

562

== {{id name="_Toc102982435"/}}**FOR to NEXT/Cycle** ==

563

564

When the processing between the FOR to NEXT instruction is executed unconditionally (n) times, the next processing of the NEXT instruction will be performed.

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566

(% style="text-align:center" %)

567

[[image:4_html_bdecdd2d7f545f5b.gif||class="img-thumbnail"]]

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569

**Content, range and data type**

570

571

(% class="table-bordered" %)

572

573

|(n)|Number of repetitions between FOR to NEXT instructions|1 to 32767|Signed BIN 16 bit|ANY16

574

575

(% class="table-bordered" %)

576

|(% rowspan="2" %)**Instruction**|(% rowspan="2" %)**Parameter**|(% colspan="12" %)**Devices**|(((

**Offset**

**modification**

)))|(((

**Pulse**

**extension**

)))

|**KnX**|**KnY**|**KnM**|**KnS**|**T**|**C**|**D**|**R**|**SD**|**K**|**H**|**E**|**[D]**|**XXP**

586

|FOR|Parameter 1|●|●|●|●|●|●|●|●|●|●|●|●|●|

**Features**

• When the processing between the FOR to NEXT instruction is executed unconditionally (n) times, the next processing of the NEXT instruction will be performed.

591

592

• (n) can be specified in the range of 1 to 32767. When specifying -32768 to 0, the same processing as (n)=1 will be performed.

593

594

• If you do not want to execute the processing between the FOR and NEXT instructions, use the CJ instruction to jump.

595

596

• The FOR instruction can be nested up to 5 levels.

**✎Note: **

• In the case of FOR to NEXT instruction programming with nesting between FOR to NEXT instructions, up to 5 levels can be achieved.

601

602

(% style="text-align:center" %)

603

[[image:4_html_df140146b29101ab.png||class="img-thumbnail"]]

604

605

• Do not use IRET, SRET, RET, FEND, END and other instructions to block between FOR to NEXT instructions.

606

607

• If the number of repetitions is too large, the cycle time (operation cycle) becomes longer and the watchdog timer error occurs, you need to change the watchdog timer time or reset the watchdog timer.

608

609

• The following program will become an error.

610

611

(% style="text-align:center" %)

612

[[image:4_html_3646fec26f307e30.gif||class="img-thumbnail"]]

613

614

• If the FOR to NEXT instruction is repeatedly executed and ends midway, use the BREAK instruction.

**Error code**

(% class="table-bordered" %)

619

|**Error code**|**Content**

620

|4085H|(s) read address exceeds the device range

621

|4100H|When the nesting of FOR to NEXT instructions exceeds 5 levels or the number of FOR to NEXT does not correspond

**Example**

(% style="text-align:center" %)

626

[[image:4_html_cf327fbe235812df.png||class="img-thumbnail"]]

627

628

The program INC D0 will be executed 10 times, and INC D1 will be executed 100 times.

629

630

After execution, D0 will be equal to 10 and D1 will be equal to 100.

631

632

== {{id name="_Toc102982436"/}}**BREAK/Break cycle** ==

633

634

When the processing between the FOR to NEXT instruction is executed unconditionally (n) times, the next processing of the NEXT instruction will be performed.

-[BREAK]

**Features**

• Forcibly end the repeated processing by FOR to NEXT instructions.

641

642

• This instruction can only be between FOR to NEXT, otherwise an operation error will be reported.

643

644

• The BREAK instruction can only jump out of the loop nesting structure where the instruction itself is located.

645

646

• When the contact is connected, the loop structure of the FOR to NEXT instruction where it is located is forced to end, as shown in the figure below.

647

648

(((

649

(% style="text-align:center" %)

650

[[image:4_html_c83826b59b86eb5a.png||class="img-thumbnail"]]

651

652

M0 turns ON, no matter how many cycles are left to execute, jump directly to step 35 to execute the program.

653

654

M4 turns ON, no matter how many loops are left to execute, jump directly to step 50 to execute the program.

)))

**Error code**

(% class="table-bordered" %)

660

|**Error code**|**Content**

661

|4186H|{{id name="OLE_LINK163"/}}BREAK instruction is not used between FOR to NEXT instructions

**Example**

(% style="text-align:center" %)

666

[[image:4_html_300cc2cbd41e93af.png||class="img-thumbnail"]]

667

668

The program INC D0 will be executed 10 times, and INC D1 will be executed 100 times.

669

670

When M0 is OFF, D0 will be equal to 10 and D1 will be equal to 100 after execution.

671

672

When M0 is ON, the BREAK instruction is executed, and the current loop is exited. The INC D1 instruction will not be executed, and the result D1=0.

673

674

= {{id name="_Toc21268"/}}**Master Control Instructions** =

675

676

== {{id name="_Toc102982438"/}}{{id name="_Toc25408"/}}{{id name="_Toc22131"/}}{{id name="_Toc6021"/}}**MC and MCR instructions** ==

677

678

• MC: Start main control.

679

680

• MCR: End the main control.

681

682

(% style="text-align:center" %)

683

[[image:4_html_6f51bb3cb7d2ba4f.png||class="img-thumbnail"]]

684

685

**Content, range and data type**

686

687

(% class="table-bordered" %)

688

689

|(N)|Nested ID N|0 to 7|Signed BIN 16 bit|ANY16

690

|(d)|Device number that is turned ON|-|Bit|ANY_BOOL

691

692

(% class="table-bordered" %)

693

694

|**KnX**|**KnY**|**KnM**|**KnS**|**T**|**C**|**D**|**R**|**SD**|**K**|**H**|**E**|**[D]**|**XXP**

695

696

|Parameter2|●|●|●|●|●|●|●|●|●|●|●|●| |

**Features**

The main control instruction is used to create an efficient circuit program switching program by opening and closing the common bus of the circuit program.

702

703

The transition of ordinary Circuit program and master control Circuit program is as follows:

704

705

(((

706

(% style="text-align:center" %)

707

[[image:4_html_43089229889e1c0c.png||class="img-thumbnail"]]

708

)))

709

710

MC to MCR internal program, X0 must be open to execute

■MC

• When the execution instruction of the MC instruction is turned on by the start of main control, the operation result from the start of the MC instruction to the MCR instruction is the execution result of the instruction (loop). When the MC execution instruction is OFF, the calculation results from the MC instruction to the MCR instruction are as follows.

715

716

(% class="table-bordered" %)

717

|**Devices**|**Device status**

718

|Timer|The count value becomes 0, and the coil and contact are all turned off.

719

|Counter, cumulative timer|The coil turns off, but the count value and contact remain in the current state.

720

|Devices in the OUT instruction|Forced to be OFF.

721

|(((

722

Devices in SET and RST instruction

723

724

Devices in basic and application instructions

725

)))|Keep the current state

726

727

• For MC instructions, the same nesting (N) number can be used multiple times by changing the device of (d).

728

729

• When the MC instruction is ON, the coil of the device specified in (d) will turn ON. In addition, when the same device is used in an OUT instruction, etc., it becomes a double coil. Therefore, the device specified in (d) must not be used in other instructions.

**Key points:**

If there are instructions that do not require contact (such as, FOR to NEXT instructions).If the instruction after MC can not affect the main CPU module, the instruction will execute.

■MCR

• The release instruction of the main control indicates the end of the main control range.

738

739

• Do not add a contact instruction before the MCR instruction.

740

741

• When using, MC instruction and MCR instruction of the same nesting number should be used. However, when the MCR instruction has a nested structure concentrated in one position, all main controls can be terminated by the smallest number (N) number. (Refer to notes)

■Nested structure

The main control instruction can be used through a nested structure. Each main control section is distinguished by nesting (N). N0 to N7 can be used for nesting.

746

747

By using the nested structure, it is possible to create a Circuit program that sequentially restricts the execution conditions of the program. The Circuit program using the nested structure is shown below.

748

749

(Left: Display of engineering tools, Right: Actual action loop)

750

751

(% style="text-align:center" %)

752

[[image:1652259670879-365.png||class="img-thumbnail"]]

753

754

1. Execute when A is ON;

755

1. Execute when A and B are ON;

756

1. Execute when A, B, C are ON;

757

1. It has nothing to do with A, B,

**✎Note: **

• If there is no instruction (LD, LDI, etc.) connected to the bus after the MC instruction, a program structure error occurs.

762

763

• MC to MCR instructions cannot be used in FOR to NEXT, STL to RET, subroutines, events, and interrupts. In addition, there cannot be instructions such as IRET, FEND, END, RET (SRET) inside MC to MCR to block.

764

765

• There can be up to 8 nests (N0 to N7). In the case of nesting, the MC instruction is used from the small number of nesting (N), while the MCR instruction is used from the old number. If the order is reversed, it does not become a nested structure, so the CPU module cannot operate normally.

766

767

• When the MCR instruction is a nested structure concentrated in one location, all main control can be ended by the smallest number (N) number.

**Error code**

No operation error

**Example**

(1) No nested structure

776

777

(((

778

(% style="text-align:center" %)

779

[[image:4_html_4f6cacf53f330135.png||class="img-thumbnail"]]

780

781

Main control program 1

782

783

Main control program 2

784

)))

785

786

The main control program 1 and the main control program 2 do not belong to the nested structure, so you can use N0 programming. There is no limit to the number of times N0 can be used in this case.

787

788

**(2) Nested structure**

789

790

When using the MC instruction, the number of nesting level N increases sequentially.(N0→ N1→ N2→ N3→ N4→ N5→ N6→ N7). When returning, use the MCR instruction to release from the larger nesting level. (N7→ N6→ N5→ N4→ N3→ N2→ N1 → N0).

791

792

For example, when MCR N6 and MCR N7 are not programmed, if MCR N5 is programmed, the nesting level will return to 5 at once.The nesting level can be programmed up to 8 levels (N7).

793

794

(((

795

(% style="text-align:center" %)

796

[[image:1652260093074-914.png||class="img-thumbnail"]]

)))

As shown above:

87 Walk: Level N0, Y0 will follow X1 state only when X0 is ON.

802

803

95 Walk: Level N1, Y1 will follow X3 state only when X0 and X2 are both ON.

804

805

103 Walk: Level N2, Y2 will follow X5 state only when X0, X2, and X4 are ON at the same time.

806

807

109 Walk: Level N1, use MCR N2 to return to level N1. Y3 will follow the state of X6 only when X0 and X2 are both ON.

808

809

115 walk: level N0, use MCR N1 to return to level N0. Y4 will follow the state of X7 only when X0 is ON.

810

811

121 Walk: Does not belong to the main control structure, has nothing to do with X0, X2, X4, Y5 follows the state change of X10.

812

813

= {{id name="_Toc16744"/}}**Watchdog reset** =

814

815

== {{id name="_Toc15927"/}}**WDT/watchdog timer** ==

816

817

The watchdog timer is reset by the program.

-[WDT]

**Features**

• Reset the watchdog timer through the program.

824

825

• Use when the scan time exceeds the set value of the watchdog timer depending on conditions.

826

827

• For t1 from step 0 to WDT instruction, and from WDT instruction to END instruction, do not exceed the set value of the watchdog timer.

828

829

(% style="text-align:center" %)

830

[[image:4_html_3341a4693ce1250c.png||class="img-thumbnail"]]

831

832

• The WDT instruction can be used more than twice in one scan.

**✎Note: **

• The watchdog timeout time can be set in the special register SD122. The default is 200ms.

837

838

• Use the special relay SM122 to control whether to turn on the watchdog timer function. The WDT instruction will be invalid after closing.

839

840

(% style="text-align:center" %)

841

[[image:4_html_21bc20f7ff159189.png||class="img-thumbnail"]]

842

843

(1) The watchdog timer time is set to 300ms;

844

845

(2) Refresh the watchdog timer.

**Error code**

There is no operation error.

**Example**

(% style="text-align:center" %)

854

[[image:4_html_ceca3c411d993d90.png||class="img-thumbnail"]]

855

856

The FOR to NXET instruction loop takes a long scan period for many times, which may exceed the set watchdog timer 300ms, causing the PLC to report an error and cannot continue to run. After turning on M0, the WDT instruction will run, and the watchdog timer is updated every cycle , So that it will not report an error to execute the program normally.

Wiki source code of 04 Program flow instructions

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