ABB PLC PM583-ETH can communicate starting address from 0 ???
Hello,
i have small dought about ABB modbus ,i have perfectly done MODBUS RTU Communication RS485 ,but their is some problem facing about communication.
i have tried with COM_MOD_MAST Block set as a ADDR=0, NB=5, FCT=3&4 with these setting but it is not communicated
so is ABB PLC PM583-ETH can communicate starting address from 0 ???
Answers
Hi Kstoilov,
Please find the attachment of your comment on the question of ABB PLC PM583-ETH can communicate starting address from 0?
Hi,
Yes, address 0 is possible - see attached address table from help. Please find attached the example for the logic too.
I think your request logic at COM_MOD_MAST is maybe working, but not correct. You can try with the logic from the example. DATA should be array of corresponding type (bool or int) and with corresponding lenght (at least 5 in your case)
Also check your settings for COM1 in HW configuration - RTS Control must be set to telegram for RS485
For debuging, you have to create logic for reading of error code ERNO, please note DONE and ERR outputs are active for 1 cycle only.
As far as I know, you can not use "0" as a Slave Devide adress for ABB PLCs.
Please see bloew picture for more details:
Hope it helps you.
by kstoilov
Hi,
Please provide screen shot of your Com_Mod_Mast block, and also for COM port configuration. Starting address 0 should not be a problem
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