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Subject: Query regarding plc s7 200 smart interface with EPICS
From: Arnab Dasgupta <arnabdasg@ipr.res.in>
To: tech-talk <tech-talk@aps.anl.gov>
Date: Tue, 24 Jan 2017 21:26:04 +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 or if any drivers for S7-200smart is available?  

-Thanks
 Arnab

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