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<== Date ==> <== Thread ==>

Subject: Help regarding siemens S7 200 smart communcation
From: Arnab Dasgupta <[email protected]>
To: [email protected]
Date: Wed, 18 Jan 2017 12:09:04 +0530 (IST)
Hi,

I am trying to communicate a S7200 Smart PLC ( CPU  ST-40) with EPICS using the modbus RTU protocol on linux-x86_64, but unable to do that The error is:
.
>>drvModbusAsyn::doModbusIO port A0_Out_Bits error calling writeRead, error=, nwrite=6/6, nread=0



Do I need a Serial communication port Driver for the PLC to be installed first ? I doubt it is possible for this plc. I have tried communication using Modbus Poll but it shows a Timeout Error. Kindly let me know if its possible?

-regards
 Arnab






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