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Changes for page 08 Troubleshooting

Last modified by Mora Zhou on 2023/12/22 11:04
From version 1.1
edited by Leo Wei
on 2022/06/08 12:57
Change comment: Imported from XAR
To version 5.1
edited by Leo Wei
on 2022/06/11 14:50
Change comment: There is no comment for this version

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5 5  The power board supplies power to the above CORE board and light board. When there is a problem with the power board, some signals transmitted to the above board will have problems. Common PLC power failures are as follows:
6 6  
7 7  (% class="table-bordered" %)
8 -|**Number**|**Failure**|**Troubleshooting**|**Solution**
8 +|=**Number**|=**Failure**|=**Troubleshooting**|=**Solution**
9 9  |1|The light does not light up when the power is turned on, and the PLC does not respond.|1. It is possible that the 220V connection of the host is wrong, the power supply between the motherboards is not properly connected, or the pin header is damaged and soldered.
10 10  2. Use a multimeter to measure whether there is voltage between the 24V+ of the PLC and COM, if there is no voltage, the power board is faulty;
11 11  3. Use a multimeter to measure whether there are voltages of 24V and 5V at the BD interface on the PLC. If there is voltage, the LED or core board may be damaged; if 24V is normal, but 5V is not, there may be a problem with the DC conversion circuit of the power board；|When it is suspected to be the problem of the power board, user can replace the power board for confirmation.
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21 21  The input and output of PLC is the main function of use, and I/O point problems are often caused by improper use or process\individual device problems; Including how the customer uses it, whether the mount is in compliance, etc. are all causes that lead to I/O failures .
22 22  
23 23  (% class="table-bordered" %)
24 -|**Number**|(% style="width:124px" %)**Failure**|(% style="width:747px" %)**Troubleshooting**|**Solution**
25 -|1|(% style="width:124px" %)(((
24 +|=**Number**|=**Failure**|=**Troubleshooting**|=**Solution**
25 +|1|(((
26 26  X point failure
27 -)))|(% style="width:747px" %)1. Use PLC software to detect X points that cannot be lit;
27 +)))|1. Use PLC software to detect X points that cannot be lit;
28 28  2. Connect PLC S/S to 24V, change multimeter to 20mA gear. The red test lead is on the X point of the fault, and the black test lead is on a Y point (the COMx corresponding to Y is connected to the COM terminal of the 24V voltage);
29 29  3.Use PLC software to control the on-off of the Y point(connected in step2) to check whether there is current on the multimeter. The high-speed input current is about 6.8mA, and the low-speed input current is about 4.7mA.|If no voltage is detected, the motherboard needs to be replaced for confirmation.
30 -|2|(% style="width:124px" %)Y point failure|(% style="width:747px" %)1. All COMx of PLC are connected to COM;
30 +|2|Y point failure|1. All COMx of PLC are connected to COM;
31 31  2. Power on the PLC, use the buzzer of the multimeter, pen one test lead on COM, and the other on the Y that needs to be detected, and observe whether the buzzer sounds when the lamp board Y is not lit. ;|The normal situation is that the buzzer will beep when Y is turned on, and there will be no buzzer when it is turned off, or the Y point needs to be replaced.
32 32  
33 33  = **3. Communication failure** =
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35 35  The main communication ports of PLC are two serial ports, one S terminal serial port, and one USB port. The specific troubleshooting methods for communication faults are as follows：
36 36  
37 37  (% class="table-bordered" %)
38 -|**Number**|**Failure**|**Troubleshooting**|**Solution**
38 +|=**Number**|=**Failure**|=**Troubleshooting**|=**Solution**
39 39  |1|USB not recognized|1. For PLCs used for a long time, it may be caused by the oxidation of the USB port or poor contact in other places;
40 40  2. For the new PLC, it may be a USB problem or an inconsistent software version;|If no voltage is detected, the motherboard needs to be replaced for confirmation.
41 41  |2|485 port cannot communicate|1. Power on the PLC, observe the transceiver communication lights on the side of the serial port terminal, you can preliminarily determine which serial port has the problem of receiving/transmitting;