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Changes for page Siemens

Last modified by Joe on 2024/08/30 14:46
From version 16.1
edited by Theodore Xu
on 2023/08/25 15:46
Change comment: There is no comment for this version
To version 49.2
edited by Joe
on 2024/04/30 14:26
Change comment: There is no comment for this version

Summary

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Author
... ... @@ -1,1 +1,1 @@
1 -XWiki.AiXia
1 +XWiki.joe
Content
... ... @@ -1,41 +3,121 @@
1 -= {{id name="HSiemens"/}}**Siemens ** =
2 -
3 3  == **S7-200 Smart Serial** ==
4 4  
5 -== **S7-200 Smart Ethernet ** ==
3 +**V-BOX setting**
6 6  
7 -[[download link>>url:https://ftp.we-con.com.cn/Download/WIKI/V-BOX/Demo/%E9%80%9A%E8%AE%AF%E6%A1%88%E4%BE%8B/Communication%20with%20S7-200%20Smart.zip]]
5 +(% style="width:1323.87px" %)
6 +|**Items**|**Settings**|**Note**
7 +|Protocol|(% style="width:783px" %)Siemens S7-200 CPU22x/Smart PPI|
8 +|Connection|(% style="width:783px" %)RS485|
9 +|Baud rate|(% style="width:783px" %)9600|
10 +|Data bit|(% style="width:783px" %)8|
11 +|Parity|(% style="width:783px" %)EVEN|
12 +|Stop bit|(% style="width:783px" %)1|
13 +|PLC station No.|(% style="width:783px" %)2|
8 8  
9 -= **1）V-BOX ** =
15 +(% style="text-align:center" %)
16 +[[image:西门子200串口.png]]
10 10  
11 -|**Item**|**Settings**|**Note**
12 -|Protocol|Siemens S7-200 Smart(Ethemet)|
13 -|Connection|Ethernet|
14 -|Port No.|5002|Must be the same as the PLC setting
15 -|PLC station No.|0|
18 +**Address List **
16 16  
20 +|**Type**|**Device register**|**Format**|**Range**|**Note**
21 +|(% rowspan="9" %)Bit|I|I ddddd.o|0.0~~99999.7|
22 +|Q|Q ddddd.o|0.0~~99999.7|
23 +|V|VWbit ddddd.o|0.0~~99999.7|
24 +|V|V ddddd.o|0.0~~99999.7|
25 +|M|M ddddd.o|0.0~~99999.7|
26 +|SM|ddddd.o|0.0~~99999.7|
27 +|S|ddddd.o|0.0~~99999.7|Read only
28 +|T|ddddd|0~~99999|Timer state, read only
29 +|C|ddddd|0~~99999|Counter state, read only
30 +|(% rowspan="12" %)Word|I|IW ddddd|0~~99999|
31 +|Q|QW ddddd|0~~99999|
32 +|AI|AIW ddddd|0~~99999|
33 +|AQ|VB ddddd|0~~99999|
34 +|V|VW ddddd|0~~99998|(((
35 +VW0=VB (0~~1)
36 +
37 +VW2=VB (2~~3)
38 +
39 +Address value is a multiple of 2
40 +)))
41 +|V|VD ddddd|0~~99998|(((
42 +VD0=VB (0~~3)
43 +
44 +VD2=VB (4~~7)
45 +
46 +Address value is a multiple of 4
47 +)))
48 +|M|MB ddddd|0~~99999|
49 +|M|MW ddddd|0~~99999|(((
50 +MW0=MB(0~~1)
51 +
52 +MW2=MB(2~~3)
53 +
54 +Address value is a multiple of 2
55 +)))
56 +|M|MD ddddd|0~~99999|(((
57 +MD0=MB(0~~3)
58 +
59 +MD4=MB(4~~7)
60 +
61 +Address value is a multiple of 4
62 +)))
63 +|T|TW ddddd|0~~99999|Value of timer
64 +|C|CW ddddd|0~~99999|Value of counter
65 +|W|SW ddddd|0~~99999|
66 +
67 +**PLC setting**
68 +
17 17  (% style="text-align:center" %)
70 +[[image:西门子软件版本.png]]
71 +
72 +(% style="text-align:center" %)
73 +[[image:485通讯配置.png]]
74 +
75 +**Connect and Download**
76 +
77 +(% style="text-align:center" %)
78 +[[image:以太网 PC和PLC连接.png]]
79 +
80 +(% style="text-align:center" %)
81 +[[image:以太网下载.png]]
82 +
83 +**Cable Wiring**
84 +
85 +(% style="text-align:center" %)
86 +[[image:485接线.png]]
87 +
88 +== **S7-200 Smart Ethernet ** ==
89 +
90 +**V-BOX setting**
91 +
92 +|**Items**|**Settings**
93 +|Protocol|Siemens S7-200 Smart（Ethernet）
94 +|Connection|Ethernet
95 +|Port No.|102
96 +|PLC station No.|2
97 +
98 +(% style="text-align:center" %)
18 18  [[image:西门子200smart 以太网.png]]
19 19  
20 -**1）PLC software**
101 +**PLC setting**
21 21  
22 22  (% style="text-align:center" %)
23 23  [[image:西门子软件版本.png]]
24 24  
25 -**2）Ethernet Configuration**
26 -
27 27  (% style="text-align:center" %)
28 28  [[image:以太网通讯配置.png]]
29 29  
30 -**3）Connect PC software**
109 +**Connect and Download**
31 31  
32 32  (% style="text-align:center" %)
112 +[[image:以太网 PC和PLC连接.png]]
113 +
114 +(% style="text-align:center" %)
33 33  [[image:以太网下载.png]]
34 34  
117 +**Cable Wiring**
35 35  
36 -**5）wiring**
37 -
38 -
39 39  V-Box : RJ45 Ethernet interface
40 40  
41 41  PLC : RJ45 Ethernet interface
... ... @@ -43,13 +43,11 @@
43 43  (% style="text-align:center" %)
44 44  [[image:以太网连接.png]]
45 45  
46 -
126 +== **S7-300 Ethernet ** ==
47 47  
48 -== {{id name="HS7-300Ethernet"/}}**S7-300 Ethernet ** ==
49 -
50 50  Supported Series: Siemens S7-300 series PLC
51 51  
52 -**1）V-BOX setting**
130 +**V-BOX setting**
53 53  
54 54  |**Items**|**Settings**|**Note**
55 55  |Protocol|Simens S7-300 Ethernet|
... ... @@ -57,21 +57,21 @@
57 57  |Port No.|102|
58 58  |PLC station No.|2|Need to be same as the PLC setting
59 59  
60 -**2）Address List**
138 +**Address List**
61 61  
62 -|**Type**|**Device register**|**HMI register**|**Format**|**Range**|**Note**
63 -|(% rowspan="4" %)Bit|I|I|I ddddd.o|0.0~~99999.7|
64 -|Q|Q|Q ddddd.o|0.0~~99999.7|
65 -|M|M|M ddddd.o|0.0~~99999.7|
66 -|DB0.DB~~DB99.DB|DBxDBD|DBxDB nndddd.o|0.0~~99999999.7|(((
140 +|**Type**|**Device register**|**Format**|**Range**|**Note**
141 +|(% rowspan="4" %)Bit|I|I ddddd.o|0.0~~99999.7|
142 +|Q|Q ddddd.o|0.0~~99999.7|
143 +|M|M ddddd.o|0.0~~99999.7|
144 +|DB0.DB~~DB99.DB|DBxDB nndddd.o|0.0~~99999999.7|(((
67 67  nn: block number;
68 68  
69 69  dddd: address;
70 70  )))
71 -|(% rowspan="8" %)Word|I|IW|IW ddddd|0~~99999|
72 -|Q|QW|QW ddddd|0~~99999|
73 -|(% rowspan="3" %)M|MB|MB ddddd|0~~99999|
74 -|MW|MW ddddd|0~~99999|(((
149 +|(% rowspan="8" %)Word|I|IW ddddd|0~~99999|
150 +|Q|QW ddddd|0~~99999|
151 +|(% rowspan="3" %)M|MB ddddd|0~~99999|
152 +|MW ddddd|0~~99999|(((
75 75  MW0=MB(0~~1)
76 76  
77 77  MW2=MB(2~~3)
... ... @@ -78,7 +78,7 @@
78 78  
79 79  Address value is a multiple of 2
80 80  )))
81 -|MD|MD ddddd|0~~99999|(((
159 +|MD ddddd|0~~99999|(((
82 82  MD0=MB(0~~3)
83 83  
84 84  MD4=MB(4~~7)
... ... @@ -85,49 +85,39 @@
85 85  
86 86  Address value is a multiple of 4
87 87  )))
88 -|(% rowspan="3" %)DB0.DB~~DB99.DB|DBxDBB|DBxDBB nndddd|0~~99999999|(% rowspan="3" %)(((
166 +|(% rowspan="3" %)DB0.DB~~DB99.DB|DBxDBB nndddd|0~~99999999|(% rowspan="3" %)(((
89 89  nn: block number;
90 90  
91 91  dddd: address
92 92  )))
93 -|DBxDBW|DBxDBW nndddd|0~~99999999
94 -|DBxDBD|DBxDBD nndddd|0~~99999999
171 +|DBxDBW nndddd|0~~99999999
172 +|DBxDBD nndddd|0~~99999999
95 95  
96 -**3）Configure the communication protocol**
174 +**Configure the communication protocol**
97 97  
98 -{{id name="Iimage-20220824161345-1.png"/}}[[image:xwiki_V-BOX_V-Net_Training_1+Communication_WebHome_8e00ed9483ddb629.png||alt="image-20220824161345-1.png" height="1011" width="1920"]]
176 +[[image:xwiki_V-BOX_V-Net_Training_1+Communication_WebHome_8e00ed9483ddb629.png||alt="image-20220824161345-1.png" height="1011" width="1920"]]
99 99  
100 -**4）Cable Wiring**
178 +**Cable Wiring**
101 101  
102 -{{id name="Iimage-20220824161450-2.png"/}}[[image:xwiki_V-BOX_V-Net_Training_1+Communication_WebHome_ac8ece9a26719fda.png||alt="image-20220824161450-2.png" height="170" width="401"]]
180 +[[image:xwiki_V-BOX_V-Net_Training_1+Communication_WebHome_ac8ece9a26719fda.png||alt="image-20220824161450-2.png" height="170" width="401"]]
103 103  
104 -== {{id name="HS7-1200A0Ethernet"/}}**S7-1200 Ethernet ** ==
182 +== **S7-1200 Ethernet ** ==
105 105  
106 106  [[download link>>url:https://ftp.we-con.com.cn/Download/WIKI/V-BOX/Demo/%E9%80%9A%E8%AE%AF%E6%A1%88%E4%BE%8B/Communicate%20with%20S7-1200%20via%20Ehernet.zip]]
107 107  
108 -== {{id name="HS7-XXXEthernetl"/}}**S7-XXX Ethernet l** ==
186 +**V-BOX Setting**
109 109  
110 -Supported Series: Siemens S7-400, S7-1200 and S7-1500
111 -
112 -**1）V-BOX setting**
113 -
114 -|=**Items**|=**Settings**|=**Note**
115 -|Protocol|Siemens S7-XXX|
188 +|**Items**|**Settings**|**Note**
189 +|Protocol|Siemens S7-1200|
116 116  |Connection|Ethernet|
117 117  |Port No.|102|
118 -|Device No.|Slot (Default 1 for S7-1500/ 2 for S7-1200/ 3 for S7-400)|
119 -|HMI No.|Rack (Default as 0)|
192 +|PLC station No.|2|
120 120  
121 -Slot from TIA Portal is equal to Device No. of V-net
194 +(% style="text-align:center" %)
195 +[[image:西门子1200协议参数.png]]
122 122  
123 -Rack from TIA Portal is equal to HMI No. of V-net
197 +**Address List**
124 124  
125 -{{id name="Iimage-20220824162459-3.png"/}}[[image:xwiki_V-BOX_V-Net_Training_1+Communication_WebHome_d78bc267e5fc6394.png||alt="image-20220824162459-3.png" height="503" width="798"]]
126 -
127 -{{id name="Iimage-20220824163305-2.png"/}}[[image:xwiki_V-BOX_V-Net_Training_1+Communication_WebHome_c9ae84ef5d418580.png||alt="image-20220824163305-2.png" height="1009" width="1920"]]
128 -
129 -**2）Address List**
130 -
131 131  |**Type**|**Device register**|**HMI register**|**Format**|**Range**|**Note**
132 132  |(% rowspan="4" %)Bit|I|I|M d.o|(((
133 133  d:0~-~-9999
... ... @@ -206,18 +206,175 @@
206 206  Address value is a multiple of 4
207 207  )))
208 208  
209 -**3）Configure the communication protocol**
277 +{{info}}
278 +✎Note:
210 210  
211 -{{id name="Iimage-20220824163448-3.png"/}}[[image:xwiki_V-BOX_V-Net_Training_1+Communication_WebHome_9e740a8bf83ea3bf.png||alt="image-20220824163448-3.png" height="557" width="974"]]
280 +* The S7-1200 supports simultaneous connection of three devices.
281 +* V-BOX access PLC, use S7 protocol, access PLC TSAP 02.01 (S7-1200 PROFINET interface only supports three connections, the default support), detailed reference to the system manual of S7-1200.
282 +* S7-1200 String type, the default first two bytes are used to store the maximum character and valid characters, so the text data will be shifted back one word address. When interacting with the data, what way this address plc is displayed with is unknown. And because of an extra word of data causes us to display the wrong. The solution is if we use String, then the actual data address we want to operate on is actually shifted back two bytes, so as long as the address on the project is shifted back 2 bits to correspond with the actual data address.
283 +{{/info}}
212 212  
285 +**PLC Settings**
286 +
287 +Add BD
288 +
289 +* Please uncheck [Symbolic access only] option;
290 +
291 +(% style="text-align:center" %)
292 +[[image:xwiki_PIStudio_12.PLC+protocols_WebHome_872ec32d12b55aa.png]]
293 +
294 +Address settings, using BD2 as example.
295 +
296 +* DB×DBB2xxxx, DB×DBW2xxxx, DB×DBD2xxxx for accessing data of DB2 in B1.
297 +* 2 represent DB block number
298 +* xxxx represent address
299 +
300 +**Such as:**
301 +
302 +* DBxDBB20000 = DB2.DBB0
303 +* DBxDBW20004 = DB2.DBW4
304 +
305 +(% style="text-align:center" %)
306 +[[image:xwiki_PIStudio_12.PLC+protocols_WebHome_8ee8d3ac3637bfc4.png]]
307 +
308 +**How to connect with S7-1200 Firmware V4.0**
309 +
310 +PLC configuration
311 +
312 +* Double click [device configuration] in Siemens via software
313 +* Double click [protection] to enter protection configuration screen
314 +
315 +(% style="text-align:center" %)
316 +[[image:xwiki_PIStudio_12.PLC+protocols_WebHome_664a826cd356c830.png]]
317 +
318 +* Check [Permit access with PUT / GET communication from remote partner (PLC, HMI, OPC, ...)]
319 +
320 +(% style="text-align:center" %)
321 +[[image:xwiki_PIStudio_12.PLC+protocols_WebHome_78026942a88f0fdb.png]]
322 +
323 +DB settings
324 +
325 +* Right click [DB], select [properties]
326 +* Uncheck [optimized block access]
327 +
328 +**Cable Wiring**
329 +
330 +(% style="text-align:center" %)
331 +[[image:xwiki_PIStudio_12.PLC+protocols_WebHome_ac8ece9a26719fda.png]]
332 +
333 +== **S7-XXX Ethernet** ==
334 +
335 +Supported Series: Siemens S7-400, S7-1200 and S7-1500
336 +
337 +**V-BOX setting**
338 +
339 +|=**Items**|=**Settings**|=**Note**
340 +|Protocol|Siemens S7-XXX|
341 +|Connection|Ethernet|
342 +|Port No.|102|
343 +|Device No.|Slot (Default 1 for S7-1500/ 2 for S7-1200/ 3 for S7-400)|
344 +|HMI No.|Rack (Default as 0)|
345 +
346 +Slot from TIA Portal is equal to Device No. of V-net
347 +
348 +Rack from TIA Portal is equal to HMI No. of V-net
349 +
350 +[[image:xwiki_V-BOX_V-Net_Training_1+Communication_WebHome_d78bc267e5fc6394.png||alt="image-20220824162459-3.png" height="503" width="798"]]
351 +
352 +[[image:xwiki_V-BOX_V-Net_Training_1+Communication_WebHome_c9ae84ef5d418580.png||alt="image-20220824163305-2.png" height="1009" width="1920"]]
353 +
354 +**Address List**
355 +
356 +|**Type**|**Device register**|**Format**|**Range**|**Note**
357 +|(% rowspan="4" %)Bit|I|M d.o|(((
358 +d:0~-~-9999
359 +
360 +o:0-7
361 +)))|
362 +|Q|Q d.o|(((
363 +d:0~-~-9999
364 +
365 +o:0-7
366 +)))|
367 +|M|M d.o|(((
368 +d:0~-~-9999
369 +
370 +o:0-7
371 +)))|
372 +|DB0.DB-DB99.DB|DBxDBnndddd.o|(((
373 +nn:0-9999,
374 +
375 +dddd:0-9999,
376 +
377 +o:0-7
378 +)))|(((
379 +nn:DB No.
380 +
381 +dddd:address value
382 +
383 +o: digit address
384 +)))
385 +|(% rowspan="8" %)Word|M|MB d|d:0-99999|
386 +|M|MW d|d:0-99999|(((
387 +MW0=MB(0~~1)
388 +
389 +MW2=MB(2~~3)
390 +
391 +Address value is a multiple of 2
392 +)))
393 +|M|MD d|d:0-99999|(((
394 +MD0=MB(0~~3)
395 +
396 +MD4=MB(4~~7)
397 +
398 +Address value is a multiple of 4
399 +)))
400 +|I|IW d|d:0-99999|
401 +|Q|QW d|d:0-99999|
402 +|DB0.DB-DB99.DB|DBxDBBnndddd|(((
403 +nn:0-9999
404 +
405 +dddd:0-9999
406 +)))|(((
407 +nn:DB No.
408 +
409 +dddd:address value
410 +)))
411 +|DB0.DB-DB99.DB|DBxDBWnndddd|(((
412 +nn:0-9999
413 +
414 +dddd:0-9999
415 +)))|(((
416 +nn:DB No.
417 +
418 +dddd:address value
419 +
420 +Address value is a multiple of 2
421 +)))
422 +|DB0.DB-DB99.DB|DBxDBDnndddd|(((
423 +nn:0-9999
424 +
425 +dddd:0-9999
426 +)))|(((
427 +nn:DB No.
428 +
429 +dddd:address value
430 +
431 +Address value is a multiple of 4
432 +)))
433 +
434 +**Configure the communication protocol**
435 +
436 +[[image:xwiki_V-BOX_V-Net_Training_1+Communication_WebHome_9e740a8bf83ea3bf.png||alt="image-20220824163448-3.png" height="557" width="974"]]
437 +
213 213  **✎Note:**
214 214  
215 215  * The S7-1200 supports simultaneous connection of three devices, so the driver supports simultaneous access to PLC by three V-BOX.
216 216  * V-BOX access PLC, use S7 protocol, access PLC TSAP 02.01 (s7-1200 PROFINET interface only supports three connections, the default support), detailed reference to the system manual of S7-1200.
217 217  
218 -**4）Cable Wiring**
443 +**Cable Wiring**
219 219  
220 -{{id name="Iimage-20220824162342-2.png"/}}[[image:xwiki_V-BOX_V-Net_Training_1+Communication_WebHome_ac8ece9a26719fda.png||alt="image-20220824162342-2.png" height="170" width="401"]]
445 +[[image:xwiki_V-BOX_V-Net_Training_1+Communication_WebHome_ac8ece9a26719fda.png||alt="image-20220824162342-2.png" height="170" width="401"]]
221 221  
222 222  == {{id name="HLOGOEthernet"/}}**LOGO Ethernet ** ==
223 223  
... ... @@ -254,40 +254,47 @@
254 254  
255 255  Click [Tools]~-~-[Ethernet Connections],shown as below.
256 256  
257 -{{id name="IPIStudio.125C.PLCprotocols.WebHome4012.PLCProtocol_html_8b9d2322edf89519.png"/}}[[image:xwiki_V-BOX_V-Net_Training_1+Communication_WebHome_d13df637bfedcc52.png||alt="12.PLC Protocol_html_8b9d2322edf89519.png" height="641" width="423"]]
482 +[[image:xwiki_V-BOX_V-Net_Training_1+Communication_WebHome_d13df637bfedcc52.png||alt="12.PLC Protocol_html_8b9d2322edf89519.png" height="641" width="423"]]
258 258  
259 259  Set Ethernet connection parameter. IP, Subnet Mask, shown as below.
260 260  
261 -{{id name="IPIStudio.125C.PLCprotocols.WebHome40image-20221228142937-4.png"/}}[[image:xwiki_V-BOX_V-Net_Training_1+Communication_WebHome_316247e0130c4c55.png||alt="image-20221228142937-4.png" height="484" width="366"]]
486 +(% style="text-align:center" %)
487 +[[image:hXadxkZTuR.png]]
262 262  
263 -**TSAP set**:The value set by local TSAP is the remote TSAP set in HMI. PLC's remote TSAP is the opposite,shown as below.
489 +**TSAP set**: The value set by local TSAP is the remote TSAP set in HMI. PLC's remote TSAP is the opposite,shown as below.
264 264  
265 -{{id name="IPIStudio.125C.PLCprotocols.WebHome40image-20221228143047-5.png"/}}[[image:xwiki_V-BOX_V-Net_Training_1+Communication_WebHome_facc6ee1af05162f.png||alt="image-20221228143047-5.png" height="626" width="1088"]]
491 +[[image:xwiki_V-BOX_V-Net_Training_1+Communication_WebHome_facc6ee1af05162f.png||alt="image-20221228143047-5.png" height="626" width="1088"]]
266 266  
267 267   **Download Project**: Click "Address book" to add the IP address to be downloaded (fi."Detect" to check whether the IP address can be detected. Then click “ok”, and the system will prompt that PLC will be "STOP" mode. Click “YES” to start download.
268 268  
269 -{{id name="IPIStudio.125C.PLCprotocols.WebHome40image-20221228143246-6.png"/}}[[image:xwiki_V-BOX_V-Net_Training_1+Communication_WebHome_d43d2b7b2599ee64.png||alt="image-20221228143246-6.png" height="698" width="688"]]
495 +[[image:xwiki_V-BOX_V-Net_Training_1+Communication_WebHome_d43d2b7b2599ee64.png||alt="image-20221228143246-6.png" height="698" width="688"]]
270 270  
271 271  **V-BOX Communication Settings**
272 272  
273 273  Set PLC IP in [IP Address] settings;
274 274  
275 -{{id name="ILldwDGntf4.png"/}}[[image:xwiki_V-BOX_V-Net_Training_1+Communication_WebHome_ab570912d299c09.png||alt="LldwDGntf4.png" height="530" width="899"]]
501 +(% style="text-align:center" %)
502 +[[image:V-NET_Client logo.png]]
276 276  
277 -Enable V-BOX Ethernet in [Network];
278 -
279 -{{id name="IWgvjfWbQif.png"/}}[[image:xwiki_V-BOX_V-Net_Training_1+Communication_WebHome_637860db3ca1ca1b.png||alt="WgvjfWbQif.png" height="654" width="1195"]]
280 -
281 281  TSAP setting
282 282  
283 283  * The initialization script needs to set the source TSAP address and the target TSAP address, otherwise the communication will not be successful.
284 284  
508 +You can copy the following script into V-net directly.
509 +
510 +(% class="box successmessage" %)
511 +(((
285 285  **function** **init**.main()
286 286   addr_setword("@W_0#HSW1200",8192) //~-~- Set the source TSAP address//
287 287   addr_setword("@W_0#HSW1201",4096) //~-~- Set the destination TSAP address//
288 - **end**
515 +**end**
516 +)))
289 289  
290 -Note: The name of the test script is init, 8192 and 4096 are the data used for the test, there is no HSW address in the register option, but you can directly set the value of the corresponding address through the code.
518 +(% class="box infomessage" %)
519 +(((
520 +Note:
521 +The name of the test script must be “init”, 8192 and 4096 are the data used for the test, there is no HSW address in the register option, but you can directly set the value of the corresponding address through the code.
522 +)))
291 291  
292 292  **✎Note:**
293 293  
... ... @@ -298,4 +298,4 @@
298 298  ** Other set as defaulted.
299 299  * **Notes on the use of registers:**
300 300  ** Register VD: Use only registers that are multiples of 4, such as 0, 4, 8, etc.
301 -** Register VW: Use only registers thay are multiples of 2, such as 0, 2, 4 etc. (Using an odd-length register may result in data errors, such as 2 3 4 )
533 +** Register VW: Use only registers they are multiples of 2, such as 0, 2, 4 etc. (Using an odd-length register may result in data errors, such as 2 3 4 )
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