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MB_CLIENT Busy all the time

3/1/2016 4:30 PM	Rate (0)
Op27 Posts: 26 Rating: (0)	Hello! I am trying to estalish communication between S7 1200 and COMAP IG-NTC-BB controller by means of MODBUS TCP connection. Now, I am able to read data from COMAP controller by MODBUS simulator "MODBUS POLL". But when I try to do the same with S 1200 does not work. Picture of MB_CLIENT block is in attachment. The IP addresses are good and port 502 is ok. I am able to ping both controllers. Even connection is in my oppinion established, but i just can not read data. What could be the problem? The block is allway BUSY, never DONE ? Attachment MB_CLIENT.png (954 Downloads)
Op27 Posts: 26 Rating: (0)
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3/1/2016 5:20 PM	Rate (0)
Kaulquappe Posts: 3093 Rating: (324)	Hello Marin, does COMAP expect a distinct UNIT? MB_CLIENT uses 255 as default, most of the simulation programs use 1. Regards, Kaulquappe
Kaulquappe Posts: 3093 Rating: (324)
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This contribution was helpful to 1 thankful Users Op27

3/1/2016 10:09 PM	Rate (0)
Op27 Posts: 26 Rating: (0)	Thank you very much! :) Yes this was the problem, I changed Unit ID to 1 ( it was default 255). Thanks!!
Op27 Posts: 26 Rating: (0)
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This contribution was helpful to 2 thankful Users Min_Moderator Kaulquappe

8/30/2018 3:32 PM	Rate (0)
Gertjie Posts: 2 Rating: (0)	Hi Did you change the Comap ID to 1? Default on my Comap is 1 but I don't get comms. Same as your original problem. OK I came right, Changed DB value to 1 and it works! Thanks.
Gertjie Posts: 2 Rating: (0)	Last edited by: Gertjie at: 8/30/2018 4:00:19 PM
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8/30/2018 3:34 PM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 3/27/2025 Posts: 34969 Rating: (4377)	Gertjie Hi Did you change the Comap ID to 1? Default on my Comap is 1 but I don't get comms. Same as your original problem. Did you see that the topic is over 2 years old?

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8/30/2018 3:52 PM	Rate (0)
Kaulquappe Posts: 3093 Rating: (324)	Gertjie Hi Did you change the Comap ID to 1? Default on my Comap is 1 but I don't get comms. Same as your original problem. Hello, which error does MB_CLIENT report? Regards, Kaulquappe
Kaulquappe Posts: 3093 Rating: (324)
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8/30/2018 4:01 PM	Rate (0)
Gertjie Posts: 2 Rating: (0)	Came right with your original solution, thank you!
Gertjie Posts: 2 Rating: (0)
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