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

Subject: Re: EPICS drivers for PLCs?
From: DMW Software <[email protected]>
To: [email protected]
Cc: [email protected]
Date: Mon, 22 Nov 1999 13:40:32 EST
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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References:
EPICS drivers for PLCs? Tony Wilson

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