How to configure in software, AC500 CPU as Modbus RTU Slave?

Any sample code, screen shot or example would be helpful.

thanks in advance...

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Anish Rank: 102

Asked 6 years ago

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Using Control Builder Plus v2.xx

1 You open the interfaces.

2 Rightclick on the Com1 or/and Com2 and add modbus

3 Dobbelt rightclick on the modbus config

4 Under operation mode you choose slave and add a adress.

The baud rate and the rest should match you master.

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by Anish Rank: 102 on 7/10/2013 1:21:50 AM | Like (0) | Report

Thanks for the reply.

Can I use the COM port 1 in both RS-232 and RS-485 modes for modbus RTU?

by GustavA Rank: 72 on 7/10/2013 1:33:21 AM | Like (0) | Report

PM572 and higher can use modbus as RS232 or RS485.
PM554 and PM564 can only use RS485

by GustavA Rank: 72 on 7/10/2013 1:34:11 AM | Like (0) | Report

PM571 if you have the old hardware does also support RS232 and RS485

by GustavA Rank: 72 on 7/10/2013 1:36:37 AM | Like (0) | Report

You change between RS232 and RS485 under modbus config.
If RTS Control = telegram = rs485.

by Anish Rank: 102 on 7/10/2013 1:39:47 AM | Like (0) | Report

Any information regarding registers addressing?

How to identify Input, Output, Holding Registers and Coils?

I think it should be some memory address like %M.0.0

then what should be our starting address in masters...?

by GustavA Rank: 72 on 7/10/2013 3:40:49 AM | Like (1) | Report

If you open the programming part of codesys and open help and using index write modbus you get the adressing system.

You can access %MW0.0 for registers and %MX0.0.0 for coils.
The Input and Output you need to assign to a %M value to read it from the master.
Try adress 0-->%MW0.0 and %MX0.0.0 depends on you function code.
Usually the other brands use 30000 or 40000 as register then 40000=0 in the AC500.

by Anish Rank: 102 on 7/10/2013 3:46:42 AM | Like (0) | Report

Thanks a lot Sir...

by GustavA Rank: 72 on 7/10/2013 3:49:36 AM | Like (0) | Report

you are welcome

by Aoo Rank: 1847 on 10/19/2016 6:41:44 AM | Like (0) | Report

What if I am connected to the PLC with a ethernet cable?

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GustavA Rank: 72

Answered 6 years ago

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How to configure in software, AC500 CPU as Modbus RTU Slave?

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