Changes for page LX3V-4AD

Last modified by Devin Chen on 2024/11/27 15:04

From version 11.1
edited by Jim
on 2023/08/07 16:26
Change comment: There is no comment for this version
To version 5.1
edited by Jim
on 2023/01/06 15:01
Change comment: There is no comment for this version

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Details

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Content
... ... @@ -10,93 +10,17 @@
10 10  (% style="text-align:center" %)
11 11  [[image:LX3V-4AD_html_5159808b9e4fa86a.png||height="391" width="1000" class="img-thumbnail"]]
12 12  
13 -1. (((
14 -Extension cable and connector
15 -)))
16 -1. (((
17 -COM LED: Light when communicating Error LED: Channel calibration indicators
18 -)))
19 -1. (((
20 -Power LED: Light when connect to 24V
21 -)))
22 -1. (((
23 -State LED: Light when normal condition
24 -)))
25 -1. (((
26 -Link LED: Light when communicate with PLC
27 -)))
28 -1. (((
29 -Module name
30 -)))
31 -1. (((
32 -Extension module interface
33 -)))
34 -1. (((
35 -DIN rail mounting slot
36 -)))
37 -1. (((
38 -DIN rail hook
39 -)))
40 -1. (((
41 -Holes for direct installation: 2 places (Φ4.5)
42 -)))
13 +1. Extension cable and connector
14 +1. COM LED: Light when communicating
15 +1. Power LED: Light when connect to 24V
16 +1. State LED: Light when normal condition
17 +1. Module name
18 +1. Analog signal output terminal
19 +1. Extension module interface
20 +1. DIN rail mounting slot
21 +1. DIN rail hook
43 43  
44 44  (((
45 -(% style="margin-left:auto; margin-right:auto" %)
46 -|=**Name**|=**Description**|=**Light status**|=**Event status**
47 -|(% rowspan="2" %)(((
48 -COM LED
49 -
50 -
51 -)))|(% rowspan="2" %)(((
52 -Communication indicator for communication board and acquisition board
53 -
54 -
55 -)))|Flashing|Data interacting
56 -|Off|Data interaction error/stop/failure
57 -|(% rowspan="2" %)(((
58 -ERR LED
59 -
60 -
61 -)))|(% rowspan="2" %)(((
62 -Factory calibration LED
63 -
64 -
65 -)))|Off|Factory calibrated
66 -|Lighting|Factory uncalibrated
67 -|(% rowspan="2" %)(((
68 -24V LED
69 -
70 -
71 -)))|(% rowspan="2" %)(((
72 -Power indicator
73 -
74 -
75 -)))|Off|24V power is abnormal.
76 -|Lighting|24V power is normal.
77 -|(% rowspan="3" %)(((
78 -LINK LED
79 -
80 -
81 -)))|(% rowspan="3" %)(((
82 -Communication indicator for PLC and expansion module
83 -
84 -
85 -)))|Flashing|Data interacting
86 -|Off|Data interaction error/stop/failure
87 -|Lighting|Software running abnormal or hardware failure
88 -|(% rowspan="3" %)(((
89 -AD LED
90 -
91 -
92 -)))|(% rowspan="3" %)(((
93 -4 channel indicators
94 -
95 -
96 -)))|Flashing|Input voltage or current range exceed limit or channel unconnected
97 -|Off|Channel closed
98 -|Lighting|Input analog is in the normal range
99 -
100 100  Please use crimp terminals as indicated on the graph.
101 101  
102 102  The tightening torque should be applied 5 to 8 Kg.cm.
... ... @@ -117,9 +117,11 @@
117 117  1. If there is excessive electrical noise, connect the FG frame ground terminal with the grounded terminal on the LX3V-4AD.
118 118  1. Connect the ground terminal on the LX3V-4AD unit with the grounded terminal on the main unit. Use class 3 grounding on the main unit, if available.
119 119  
120 -**Note: when connect a 4-20ma sensor(need +24V working voltage), the wiring is as below:**
44 +(% style="text-align:center" %)
45 +[[image:4-20mA 2-wire.png||height="528" width="600" class="img-thumbnail"]]
121 121  
122 -[[image:企业微信截图_16771315134574.png]]
47 +(% style="text-align:center" %)
48 +[[image:4-20mA 3-wire.png||height="510" width="600" class="img-thumbnail"]]
123 123  
124 124  = **4 Installation** =
125 125  )))
... ... @@ -142,29 +142,29 @@
142 142  
143 143  **Analog Inputs**
144 144  
145 -(% style="margin-left:auto; margin-right:auto" %)
146 -|= |=**Voltage Input**|=**Current input**
147 -|=**Items**|(% colspan="2" %)Either voltage or current input can be selected with your choice of input terminal. Up to four input points can be used at one time.
148 -|=**Analog input range**|(((
71 +(% class="table-bordered" %)
72 +|=(% scope="row" style="width: 146px;" %) |=(% style="width: 455px;" %)**Voltage Input**|=(% style="width: 475px;" %)**Current input**
73 +|=(% style="width: 146px;" %)**Items**|(% colspan="2" style="width:930px" %)Either voltage or current input can be selected with your choice of input terminal. Up to four input points can be used at one time.
74 +|=(% style="width: 146px;" %)**Analog input range**|(% style="width:455px" %)(((
149 149  DC -10V to +10V (input resistance: 200kΩ).
150 150  
151 151  Warning: this unit may be damaged by input voltage in excess of ±15V
152 -)))|(((
78 +)))|(% style="width:475px" %)(((
153 153  DC -20mA to +20mA (input resistance: 250Ω).
154 154  
155 155  Warning: this unit may be damaged by input currents in excess of ±32mA.
156 156  )))
157 -|=**Digital output**|(% colspan="2" %)(((
83 +|=(% style="width: 146px;" %)**Digital output**|(% colspan="2" style="width:930px" %)(((
158 158  12-bit conversion stored in 16-bit 2’s complement form
159 159  
160 -Maximum value: +2047 Minimum value: -2048
86 +Maximum value:+2047 Minimum value:-2048
161 161  )))
162 -|=**Analog accuracy**|±1% (for the range of -10V to +10V)|±1% (for the range of -20mA to +20mA)
163 -|=(((
88 +|=(% style="width: 146px;" %)**Analog accuracy**|(% style="width:455px" %)±1% (for the range of -10V to +10V)|(% style="width:475px" %)±1% (for the range of -20mA to +20mA)
89 +|=(% style="width: 146px;" %)(((
164 164  **Conversion**
165 165  
166 -**time for each channel**
167 -)))|(% colspan="2" %)Tconv ≤10ms (High-speed), 10ms≤Tconv≤20ms (Middle speed), Tconv>20ms (Low speed)
92 +**speed**
93 +)))|(% colspan="2" style="width:930px" %)15ms/channel (Normal speed), 6ms/channel (High speed)
168 168  
169 169  **Analog Inputs continued...**
170 170  
... ... @@ -189,72 +189,57 @@
189 189  
190 190  **Allocation of buffer memories (BFM)**
191 191  
192 -(% style="margin-left:auto; margin-right:auto" %)
193 -|=**BFM**|=(% colspan="9" %)**Description**
194 -|*#0|(% colspan="9" %)Channel initialization, default=H0000
195 -|*#1|Channel 1|(% colspan="8" rowspan="4" %)(((
118 +(% class="table-bordered" %)
119 +|=(% scope="row" style="width: 122px;" %)**BFM**|=(% colspan="9" style="width: 954px;" %)**Description**
120 +|=(% style="width: 122px;" %)*#0|(% colspan="9" style="width:954px" %)Channel initialization, default=H0000
121 +|=(% style="width: 122px;" %)*#1|(% style="width:242px" %)Channel 1|(% colspan="8" rowspan="4" style="width:712px" %)(((
196 196  Contains the number of samples (1 to 4096) to be used for an averaged result.
197 197  
198 198  The default setting is 8-normal speed. High speed operation can be selected with a value of 1.
199 199  )))
200 -|*#2|Channel 2
201 -|*#3|Channel 3
202 -|*#4|Channel 4
203 -|#5|Channel 1|(% colspan="8" rowspan="4" %)These buffer memories contain the averaged input values for the number of samples entered for the channel in buffer memories #1 to #4 respectively.
204 -|#6|Channel 2
205 -|#7|Channel 3
206 -|#8|Channel 4
207 -|#9|Channel 1|(% colspan="8" rowspan="4" %)These buffer memories contain the present value currently being read by each input channel.
208 -|#10|Channel 2
209 -|#11|Channel 3
210 -|#12|Channel 4
211 -|#13-#14|(% colspan="9" %)Reserved
212 -|(% rowspan="10" %)#15|(% rowspan="10" %)(((
213 -Selection of A/D conversion speed
214 -
215 -Please refer to note 2
216 -)))|(% colspan="4" %)Set value|(% colspan="4" %)(((
217 -Conversion time
218 -
219 -(Unit: ms/channel)
220 -)))
221 -|(% colspan="4" %)0 (Default)|(% colspan="4" %)15
222 -|(% colspan="4" %)1|(% colspan="4" %)6
223 -|(% colspan="4" %)10|(% colspan="4" %)3
224 -|(% colspan="4" %)11|(% colspan="4" %)4.5
225 -|(% colspan="4" %)12|(% colspan="4" %)7
226 -|(% colspan="4" %)13|(% colspan="4" %)12.5
227 -|(% colspan="4" %)14|(% colspan="4" %)23.5
228 -|(% colspan="4" %)15|(% colspan="4" %)45.5
229 -|(% colspan="4" %)16|(% colspan="4" %)101
230 -|#16-#19|(% colspan="9" %)Reserved
231 -|*#20|(% colspan="9" %)Reset to Defaults and Preset. Default = 0
232 -|*#21|(% colspan="9" %)(((
126 +|=(% style="width: 122px;" %)*#2|(% style="width:242px" %)Channel 2
127 +|=(% style="width: 122px;" %)*#3|(% style="width:242px" %)Channel 3
128 +|=(% style="width: 122px;" %)*#4|(% style="width:242px" %)Channel 4
129 +|=(% style="width: 122px;" %)#5|(% style="width:242px" %)Channel 1|(% colspan="8" rowspan="4" style="width:712px" %)These buffer memories contain the averaged input values for the number of samples entered for the channel in buffer memories #1 to #4 respectively.
130 +|=(% style="width: 122px;" %)#6|(% style="width:242px" %)Channel 2
131 +|=(% style="width: 122px;" %)#7|(% style="width:242px" %)Channel 3
132 +|=(% style="width: 122px;" %)#8|(% style="width:242px" %)Channel 4
133 +|=(% style="width: 122px;" %)#9|(% style="width:242px" %)Channel 1|(% colspan="8" rowspan="4" style="width:712px" %)These buffer memories contain the present value currently being read by each input channel.
134 +|=(% style="width: 122px;" %)#10|(% style="width:242px" %)Channel 2
135 +|=(% style="width: 122px;" %)#11|(% style="width:242px" %)Channel 3
136 +|=(% style="width: 122px;" %)#12|(% style="width:242px" %)Channel 4
137 +|=(% style="width: 122px;" %)#13-#14|(% colspan="9" style="width:954px" %)Reserved
138 +|=(% rowspan="2" style="width: 122px;" %)#15|(% rowspan="2" style="width:242px" %)Selection of A/D conversion speed please refer to note 2|(% colspan="8" style="width:712px" %)When set to 0, a normal speed is selected of 15m/s.ch (default)
139 +|=(% colspan="8" style="width: 712px;" %)When set to 1, a high speed is selected of 6m/s.ch
140 +|=(% style="width: 122px;" %)#16-#19|(% colspan="9" style="width:954px" %)Reserved
141 +|=(% style="width: 122px;" %)*#20|(% colspan="9" style="width:954px" %)Reset to Defaults and Preset. Default = 0
142 +|=(% style="width: 122px;" %)*#21|(% colspan="9" style="width:954px" %)(((
233 233  Offset, Gain Adjust Prohibit.
234 234  
235 235  Default = (0, 1) Permit
236 236  )))
237 -|*#22|Offset, Gain Adjust|G4|04|G3|03|G2|01|G1|01
238 -|*#23|(% colspan="9" %)Offset Value    Default = 0
239 -|*#24|(% colspan="9" %)Gain Value      Default = 5,000
240 -|#25-#28|(% colspan="9" %)Reserved
241 -|#29|(% colspan="9" %)Error status
242 -|#30|(% colspan="9" %)(((
147 +|=(% rowspan="2" style="width: 122px;" %)*#22|(% rowspan="2" style="width:242px" %)Offset, Gain Adjust|(% style="width:74px" %)b7|(% style="width:80px" %)b6|(% style="width:84px" %)b5|(% style="width:94px" %)b4|(% style="width:100px" %)b3|(% style="width:107px" %)b2|(% style="width:120px" %)b1|b0
148 +|=(% style="width: 74px;" %)G4|(% style="width:80px" %)O4|(% style="width:84px" %)G3|(% style="width:94px" %)O3|(% style="width:100px" %)G2|(% style="width:107px" %)O2|(% style="width:120px" %)G1|O1
149 +|=(% style="width: 122px;" %)*#23|(% colspan="9" style="width:954px" %)Offset Value Default = 0
150 +|=(% style="width: 122px;" %)*#24|(% colspan="9" style="width:954px" %)Gain Value Default = 5,000
151 +|=(% style="width: 122px;" %)#25-#28|(% colspan="9" style="width:954px" %)Reserved
152 +|=(% style="width: 122px;" %)#29|(% colspan="9" style="width:954px" %)Error status
153 +|=(% style="width: 122px;" %)#30|(% colspan="9" style="width:954px" %)(((
243 243  Identification code K2010 (12-bit resolution)
244 244  
245 245  Identification code K2011 (16-bit resolution)
246 246  )))
247 -|#31|(% colspan="9" %)Hardware version
158 +|=(% style="width: 122px;" %)#31|(% colspan="9" style="width:954px" %)Hardware version
248 248  
249 -(% class="box infomessage" %)
250 -(((
251 -**✎Note: **
252 -
253 253  * In buffer memory locations (BFM’s) marked with an “*” data can be written from the PC using the TO command.
254 254  * For buffer memories (BFM’s) without “*”mark, data can be read to the PC using the FROM command.
255 255  * Before reading from the analog special function block, ensure these settings have been sent to the analog special function block. Otherwise, the previous values held in the analog block will be used.
256 256  * Offset (intercept): The analog input value when the digital output becomes 0.
257 257  * Gain (slope): The analog input value when the digital output becomes +1000.
165 +
166 +(% class="box infomessage" %)
167 +(((
168 +**✎Note: **
258 258  )))
259 259  
260 260  **Channel Selection**
... ... @@ -279,15 +279,14 @@
279 279  
280 280  **Analog to Digital Conversion Speed Change**
281 281  
282 -By writing 0, 1 or decimal numbers between 10-16 into BFM#15 of the LX3V-4AD, the time at which A/D conversion is performed can be changed.
193 +By writing 0 or 1 into BFM #15 of the LX3V-4AD, the speed at which A/D conversion is performed can be changed.
283 283  
284 -However, the following points should be noted:
195 +However the following points should be noted: To maintain a high speed conversion rate, use the FROM/TO commands as seldom as possible.
285 285  
286 -1. To maintain a high-speed conversion, please use the FROM/TO commands as seldom as possible.
287 -1. When a conversion speed change occurs, BFM #1-#4 are set to their default values immediately after the change. Please be careful if an A/D time conversion will be part of the normal program execution.
288 -1. High-speed time conversion is usually used with BFM#1-#4.
289 -1. BFM#15 is configurated with the corresponding conversion time of 10-16, only supported by software version 20000 or above.
197 +**✎Note: **
290 290  
199 +* When a conversion speed change is made, BFM #1-#4 are set to their default values immediately after the change. This is regardless of the values they held originally. Bear this in mind if a speed change will be made as part of the normal program execution.
200 +
291 291  **Adjusting Gain and Offset values**
292 292  
293 293  **Formula for Gain/Offset: Digital output= (Analog input-Offset)*Constant/ (Gain-Offset)**
... ... @@ -295,15 +295,7 @@
295 295  * When buffer memory BFM #20 is activated by setting it to K1, all settings within the analog special function block are reset to their default settings. This is a very quick method to erase any undesired gain and offset adjustments.
296 296  * If (b1, b0) of BFM #21 is set to (1, 0), gain and offset adjustments are prohibited to prevent inadvertent changes by the operator. In order to adjust the gain and offset values, bits (b1, b0) must be set to (0, 1). The default is (0, 1).
297 297  * Gain and offset values of BFM #23 and #24 are sent to non-volatile memory gain and offset registers of the specified input channels. Input channels to be adjusted are specified by the appropriate G-O (gain-offset) bits of BFM #22.
298 -* (((
299 -Example:
300 300  
301 -If bits G1 and O1 are set to 1, input channel 1 will be adjusted when BFM #22 is written to by a TO instruction.
302 -)))
303 -* Channels can be adjusted individually or together with the same gain and offset values.
304 -* Gain and offset values in BFM #23 #24 are in units of mV or µA. Due to the resolution of the unit the actual response will be in steps of 5mV or 20µA.
305 -* When gain is less than or equal to offset, error will be adjusted. Gain and offset will not change. Error status will be given at BFM#29 b1. B4-b7 will give a specific channel offset/gain error.
306 -
307 307  Example:
308 308  
309 309  If bits G1 and O1 are set to 1, input channel 1 will be adjusted when BFM #22 is written to by a TO instruction.
... ... @@ -313,21 +313,17 @@
313 313  
314 314  **Status Information BFM #29**
315 315  
316 -(% style="margin-left:auto; margin-right:auto" %)
317 -|=**Bit devices of BFM #29**|=**ON**|=**OFF**
318 -|b0: Error|When any of b1 to b4 is ON. If any of b2 to b4 is ON, A/D conversion of all the channels is stopped|No error
319 -|b1: Offset/gain error|Offset/Gain data in EEPROM is corrupted or adjustment error.|Offset/Gain data normal
320 -|b2: Power source abnormality|24V DC power supply failure|Power supply normal
321 -|b3: Hardware error|A/D converter or other hardware failure|Hardware normal
322 -|b4: Channel 1 offset/gain error|(% rowspan="4" %)When channel offset/gain error is modified, the corresponding position is ON.|(% rowspan="4" %)Offset/Gain adjustment normal
323 -|b5: Channel 2 offset/gain error
324 -|b6: Channel 3 offset/gain error
325 -|b7: Channel 4 offset/gain error
326 -|b10: Digital range error|Digital output value is less than -2048 or more than +2047|Averaging is normal. (Between 1 and 4096)
327 -|b11: Averaging error|Number of averaging samples is 4097 or more or 0 or less (default of 8 will be used)|Averaging is normal. (Between 1 and 4096)
328 -|b12: Adjust prohibit|Prohibit-(b1, b0) of BFM #21 is set to (1, 0)|Permit-(b1, b0) of BFM #21 is set to (0,1)
218 +(% class="table-bordered" %)
219 +|=(% scope="row" style="width: 209px;" %)**Bit devices of BFM #29**|=(% style="width: 564px;" %)**ON**|=(% style="width: 303px;" %)**OFF**
220 +|=(% style="width: 209px;" %)b0: Error|(% style="width:564px" %)When any of b1 to b4 is ON. If any of b2 to b4 is ON, A/D conversion of all the channels is stopped|(% style="width:303px" %)No error
221 +|=(% style="width: 209px;" %)b1: Offset/gain error|(% style="width:564px" %)Offset/Gain data in EEPROM is corrupted or adjustment error.|(% style="width:303px" %)Offset/Gain data normal
222 +|=(% style="width: 209px;" %)b2: Power source abnormality|(% style="width:564px" %)24V DC power supply failure|(% style="width:303px" %)Power supply normal
223 +|=(% style="width: 209px;" %)b3: Hardware error|(% style="width:564px" %)A/D converter or other hardware failure|(% style="width:303px" %)Hardware normal
224 +|=(% style="width: 209px;" %)b10: Digital range error|(% style="width:564px" %)Digital output value is less than -2048 or more than +2047|(% style="width:303px" %)Averaging is normal. (between 1 and 4096)
225 +|=(% style="width: 209px;" %)b11: Averaging error|(% style="width:564px" %)Number of averaging samples is 4097 or more or 0 or less (default of 8 will be used)|(% style="width:303px" %)Averaging is normal. (between 1 and 4096)
226 +|=(% style="width: 209px;" %)b12: Adjust prohibit|(% style="width:564px" %)Prohibit-(b1, b0) of BFM #21 is set to (1, 0)|(% style="width:303px" %)Permit-(b1, b0) of BFM #21 is set to (0,1)
329 329  
330 -**✎Note: **b8, b9 and b13 to b15 are undefined.
228 +**✎Note: **b4 to b7, b9 and b13 to b15 are undefined.
331 331  
332 332  **Identification Code BFM #30**
333 333  
... ... @@ -362,7 +362,7 @@
362 362  
363 363  Offset and gain can be set independently or together. Reasonable offset ranges are -5 to +5V or -20mA to 20mA, and gain values 1V to 15V or 4mA to 32mA. Gain and offset can be adjusted by software in the LX3V main unit (please refer to program example 2).
364 364  
365 -* Bit device’s b1, b0 of the gain/offset BFM #21 should be set to 0, 1 to allow adjustment.
263 +* Bit device’s b1, b2 of the gain/offset BFM #21 should be set to 0, 1 to allow adjustment.
366 366  * Once adjustment is complete these bit devices should be set to 1, 0 to prohibit any further changes.
367 367  * Channel initialization (BFM #0) should be set to the nearest range, i. e. voltage/current etc.
368 368  
... ... @@ -370,19 +370,19 @@
370 370  
371 371  **Basic program**
372 372  
373 -In the following example channels CH1 and CH2 are used as voltage inputs. The LX3V-4AD block is connected at the position of special function block No.0. Averaging is set at 4 and data registers D0 and D1 of the PC receive the averaged digital data. The FROM code for the special function block at position “0" is read from BFM #30 of that block and stored at D4 in the main unit. CMP is compared to check the block is a LX3V-4AD, if OK M1 is turned ON.
271 +In the following example channels CH1 and CH2 are used as voltage inputs. The LX3V-4AD block is connected at the position of special function block No.0. Averaging is set at 4 and data registers D0 and D1 of the PC receive the averaged digital data.
374 374  
375 -[[image:LX3V-4AD_html_e3a9b9608260f138.png||height="297" style="float:left" width="600" class="img-thumbnail"]]
273 +(% style="text-align:center" %)
274 +[[image:LX3V-4AD_html_e3a9b9608260f138.png||height="297" width="600" class="img-thumbnail"]]
376 376  
377 377  **✎Note: **
378 378  
278 +1. The FROM code for the special function block at position “0" is read from BFM #30 of that block and stored at D4 in the main unit. CMP is compared to check the block is a LX3V-4AD, if OK M1 is turned ON.
379 379  1. TO code: The analog input channels (CH1, CH2) are setup by writing H3300 to BFM #0 of the LX3V-4AD
380 380  1. The number of averaged samples for CH1 and CH2 is set to 4 by writing 4 to BFM #1 and #2 respectively.
381 381  1. The operational status of the LX3V-4AD is read from BFM #29 and output as bit devices at the LX3V main unit. If there are no errors in the operation of the LX3V-4AD, then the averaged data BFM’s are read.
382 382  1. In the case of this example BFM #5 and #6 are read into the LX3V main unit and stored at D0 and D1. These devices contain the averaged data for CH1 and CH2 respectively.
383 383  
384 -
385 -
386 386  **Using gain and offset in a program**
387 387  
388 388  The gain and offset of the LX3V-4AD can be adjusted using push-button switches on the input terminal of the PC. It can also be adjusted using software settings sent from the PC.
... ... @@ -411,18 +411,8 @@
411 411  Adjustment ends.
412 412  
413 413  (K2)-> BFM#21. BFM#21 gain/offset adjust prohibit
414 -
415 -**High-speed conversion by changing A/D conversion time in a program**
416 -
417 -[[image:/bin/download/Expansions/1%20Module/Analog/LX3V-4AD/WebHome/6.3-%E5%9B%BE%E7%89%871.png?rev=1.1||alt="6.3-图片1.png"]][[image:/bin/download/Expansions/1%20Module/Analog/LX3V-4AD/WebHome/6.3-%E5%9B%BE%E7%89%871.png?rev=1.1||alt="6.3-图片1.png"]][[image:/bin/download/Expansions/1%20Module/Analog/LX3V-4AD/WebHome/6.3-%E5%9B%BE%E7%89%871.png?rev=1.1||alt="6.3-图片1.png"]]**[[image:6.3-图片1.png]]**
418 418  )))
419 419  
420 -Writing K10 to BFM#15 and set conversion time of all channels as 3ms.
421 -
422 -Writing 1 to BFM#1 and set Channel 1 sample count to 1 to Channel 1 high-speed conversion.
423 -
424 -= =
425 -
426 426  = **7 Diagnostics** =
427 427  
428 428  **Preliminary checks**
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