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How can see the values in the LOGO?

Created by: casiles at: 6/4/2020 7:09 PM (6 Replies)

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6/4/2020 7:09 PM	Rate (0)
casiles Posts: 4 Rating: (0)	Thanks ixo65, so here is my new request. Hahaha. As I told you, I'm new with LOGOs. I did this connection. In the LOGO's Diagnostic, I can see the number "2" in Data Transfer, I hope that those are the two words that I'm reading. These two words, are 2 integers. How can I see the values in the LOGO? And when I click the "On line" mode, a red interrogation symbol (?) appears, with the legend, "Device Inaccassible". I sent a PING from the LOGO to the Micro850, and it is successful. I really appreciate your help. ------------------------------------------------------------------------------------------ Split from Modbus Connexion LOGO - Micro850. Attachment LOGO - Micro850.png (610 Downloads)
casiles Posts: 4 Rating: (0)	Last edited by: Jen_Moderator at: 06/05/2020 06:29:32 New subject after splitting
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6/4/2020 7:21 PM	Rate (1)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 1/19/2026 Posts: 36483 Rating: (4552)	You have to consider: The addressing in the LOGO! is byte-oriented. The addressing of the holding registers is word-oriented. When you transfer register 40001 to VW1, you write in bytes 1 and 2. When you transfer register 40033 to VW2, you write in bytes 2 and 3. Do you see the overlap? For this reason, always choose the word addresses at a distance of two. And the addressing in the LOGO! starts at 0. I would do it this way: VW0 <- HR40001 VW2 <- HR40033 I'm currently overwhelmed with the red question mark, but I'll try to find it.

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6/4/2020 7:27 PM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 1/19/2026 Posts: 36483 Rating: (4552)	The red question mark says that the LOGO! is inaccessible. See attachment. Attachment LOGO! 8 Soft Comfort Online-help 2019_03 V8.2.1 pages 46+47.pdf (606 Downloads)

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6/4/2020 7:45 PM	Rate (1)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 1/19/2026 Posts: 36483 Rating: (4552)	If you are online with the LOGO!, you can see the data in the data table. See attachment. Attachment Untitled.png (670 Downloads)

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6/5/2020 6:06 PM	Rate (0)
casiles Posts: 4 Rating: (0)	Hello Iox65, I finally did the connection between the LOGO and Micro850. I don't know why, but I only change de 40001 to 1, and it works. Now I see the values stored in the register too. Thank you very much for your help. I ready appreciate it.
casiles Posts: 4 Rating: (0)	Last edited by: casiles at: 06/05/2020 18:08:08
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This contribution was helpful to 1 thankful Users ixo65

6/5/2020 6:28 PM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 1/19/2026 Posts: 36483 Rating: (4552)	That sounds good and I'm happy for you. Why only 1 instead of 40001? I don't know. But I don't know the Micro850 either ...

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6/5/2020 11:36 PM

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Dr.Evil

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ixo65
Why only 1 instead of 40001?

Because it is the 1st Holding register.

Per wikipedia article:

Object type	Access	Size	Address Space
Coil	Read-write	1 bit	00001 - 09999
Discrete input	Read-only	1 bit	10001 - 19999
Input register	Read-only	16 bits	30001 - 39999
Holding register	Read-write	16 bits	40001 - 49999

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