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mstelt
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PostPosted: Thu Sep 14, 2017 2:09 pm |
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Joined: Fri Aug 25, 2017 1:01 pm Posts: 5
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I have a PC running control win as a slave and a SCADA program which is the master.
When I run both the Control win and the SCADA program on the same PC I get exceptions on my modbus messages. When I install one PC with control win and another one with the SCADA program everything works fine. I'm trying to read and write.
This is the log that I captured with Wireshark when both are running on the same PC:
1 0.000000 192.168.1.150 192.168.1.150 Modbus/TCP 52 Query: Trans: 16482; Unit: 1, Func: 4: Read Input Registers 3 0.004993 192.168.1.150 192.168.1.150 Modbus/TCP 55 Query: Trans: 32866; Unit: 1, Func: 16: Write Multiple Registers 5 0.004993 192.168.1.150 192.168.1.150 Modbus/TCP 49 Response: Trans: 16482; Unit: 1, Func: 4: Read Input Registers. Exception returned 7 1.000250 192.168.1.150 192.168.1.150 Modbus/TCP 52 Query: Trans: 16483; Unit: 1, Func: 4: Read Input Registers 9 1.000250 192.168.1.150 192.168.1.150 Modbus/TCP 55 Query: Trans: 32867; Unit: 1, Func: 16: Write Multiple Registers 11 1.001251 192.168.1.150 192.168.1.150 Modbus/TCP 49 Response: Trans: 16483; Unit: 1, Func: 4: Read Input Registers. Exception returned
This is the log when running on different PC's
1 0.000000 192.168.1.200 192.168.1.201 Modbus/TCP 66 Query: Trans: 16426; Unit: 1, Func: 4: Read Input Registers 2 0.000280 192.168.1.201 192.168.1.200 Modbus/TCP 65 Response: Trans: 16426; Unit: 1, Func: 4: Read Input Registers 3 0.000988 192.168.1.200 192.168.1.201 Modbus/TCP 69 Query: Trans: 32810; Unit: 1, Func: 16: Write Multiple Registers 4 0.001244 192.168.1.201 192.168.1.200 Modbus/TCP 66 Response: Trans: 32810; Unit: 1, Func: 16: Write Multiple Registers 8 1.503473 192.168.1.200 192.168.1.201 Modbus/TCP 66 Query: Trans: 16427; Unit: 1, Func: 4: Read Input Registers 9 1.504294 192.168.1.201 192.168.1.200 Modbus/TCP 65 Response: Trans: 16427; Unit: 1, Func: 4: Read Input Registers
What could be wrong?
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Edwin Schwellinger
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PostPosted: Thu Sep 21, 2017 11:12 am |
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Joined: Mon Sep 05, 2005 9:42 am Posts: 3151
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Hi, either you need to add the exception code or add a wireshark capture.
BR Edwin
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mstelt
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PostPosted: Mon Oct 02, 2017 3:15 pm |
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Joined: Fri Aug 25, 2017 1:01 pm Posts: 5
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Hi,
I don't get a exception code. The pasted lines above are copied fro the Wireshark log file.
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