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MODBUS RTU, S7-1200, TIA v11 and strange problem

11/2/2011 8:20 PM	Rate (0)
polonez Posts: 20 Rating: (1)	Hello everybody, I have a s7-1200 1212C and CM 1241 and Step 7 Basic v11 + sp1 + upd2 and PLC software v2.1 AND I have a problem which MODBUS RTU. I use modbus in v10.5 and it is work wery well. I am doing everything the same way but unfortunetly it is not work in v11 and I don't know why. Are there any new functions to keep in mind? None of the modbus block does not shows any errors. I try block of every modbus version and it is still don't work. Can enyone help me? Meybe someone send me a program which working modbus rtu in v11. I found a lot of examples but in v10.5.
polonez Posts: 20 Rating: (1)	Last edited by: polonez at: 11/3/2011 8:18 PM
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11/3/2011 8:16 PM	Rate (0)
polonez Posts: 20 Rating: (1)	Can someone give an example program from working Modbus RTU communication on TIA v11. I'll be very grateful.
polonez Posts: 20 Rating: (1)
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4/11/2012 5:22 PM	Rate (0)
Milos Antovic Advanced Member Joined: 4/11/2012 Last visit: 6/10/2024 Posts: 20 Rating: (1)	Hello, I have the same problem !!! I have one PLC as modbus RTU master and two PLC-s as modbus RTU slaves. And I communicate through GPRS modems that are connected to my PLCs via SM1241 RS 232 serial cards!!! That communication was working fine on v10.5 TIA portal but in V11 SP1 everything is working for 10 minutes, or 30 minutes (another time) or sometimes for two hours but after that communication is stopped and something strange has happened all the time (Time of correct working is different each time). Suddenlz after certain time of correct working, BUSY output of the block modbus master starting to be TRUE for a long time (5 or 6 seconds) and I can't to send WRITe OR READ request regardless everything was OK up to that time.

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4/19/2012 10:35 AM	Rate (0)
Zol Posts: 1 Rating: (0)	Hi, I found a sample program in TIA Portal help. I have attached the printscreen to navigate there. BR Zol Attachment TIA_Help.JPG (473 Downloads)
Zol Posts: 1 Rating: (0)
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