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ET200S Modbus RTU problem

Created by: morylATCS at: 6/25/2019 8:18 PM (4 Replies)

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6/25/2019 8:18 PM	Rate (0)
morylATCS Posts: 39 Rating: (0)	Hello everyone, I work with two PLC ET200S(IM 151-8 PN/DP CPU) and I have below modbus modules: 6ES7 138-4DF11-0AB0.I want to make connection between that two et200sp through modbusRTU(rs485). I have no idea what kind of Function Block I should use. Earlier I worked with ET200SP and I was using "Modbus_Comm_Load" and "Modbus_Master/Slave” and everything worked fine. When I tried to use this blocks in ET200S cpu it wasn’t working and it stopped. I read several manuals for example "et200s Serial interface operating instructions" and "Master-Slave Communication with Modbus RTU for S7-300 and ET 200S Systems". The instructions include information about blocks like “s_send and _S_rcv” but this solution doesn’t work too (status is still 0 and there is no work confirmation). Please let me know what kind of instruction will be correct to make that connection or maybe you have a project sample. Thank you for your response
morylATCS Posts: 39 Rating: (0)
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6/25/2019 9:22 PM	Rate (0)
Kaulquappe Posts: 3093 Rating: (323)	Master-Slave Communication with Modbus RTU for S7-300 and ET 200S Systems Sample program ET 200S 1SI MODBUS zXX21_11_1SI_MODBUS.zip for STEP 7 (TIA Portal)
Kaulquappe Posts: 3093 Rating: (323)
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6/26/2019 1:40 PM	Rate (0)
morylATCS Posts: 39 Rating: (0)	Thanks for your answer but It is not helpful for my problem. Solutions in sample which You sent doesn't work. Could u describe more detail how that should work ? What kind of group instruction i shoud use: Modbus RTU or ET200s serial interface or maby something different ? Thank you for your response
morylATCS Posts: 39 Rating: (0)
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6/26/2019 2:13 PM	Rate (0)
Kaulquappe Posts: 3093 Rating: (323)	Hello, "doesn't work" is no proper error description. Which error do you get? Regards, Kaulquappe
Kaulquappe Posts: 3093 Rating: (323)
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6/26/2019 2:51 PM	Rate (0)
morylATCS Posts: 39 Rating: (0)	During compilation i don't have any error but when i downloading program to PLC it's going to stop status. In diagnostic buffer i have still one information : "STOP caused by time error (OB not loaded, or not possible, or no FRB) Previous operating mode: RUN Requested operating mode: STOP (internal) Internal error"
morylATCS Posts: 39 Rating: (0)
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