Hi All,
> We are currently evaluating various types of PLCs for use at the CLS.
>We would like to know which types have EPICS drivers available. I
>currently have a driver for Allen Bradley using df1 protocol over a
>serial line. Though I am unsure if it is a general driver or only
>supports specific modules. I have been unsuccessful in locating
>anything for MODICON (Modbus or Modbus+) or Siemens hardware.
>Information about any of these three dirvers would be welcome.
I have written the Personnel Safety System controls here at at
Jefferson Lab. We exclusively use MODICON and Modbus+ protocols.
It's not in the form of an EPICS driver though. I have an "unwired"
database and push the values through some low-level code (sets up
and writes the Modbus commands) and a seqencer (evaluate the reply
and pvPut the values).
If you are interested, I would let you have a copy of the code
to look over.
David
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David M. Wetherholt - [email protected] \/ (757) 269-5066 \/\/\/
/\ /\ Thomas Jefferson National Accelerator Facility
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