Experimental Physics and Industrial Control System
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Di Maio Franck wrote:
But I also wonder if others with similar requirements (predictable traffic with PLC) are using a dedicated network interface to separate the PLC traffic from CA.
Hello Franck--
How predictable do you require, and how fast are you expecting for
PLC to EPICS communications? For SNS, we are not relying on tight
timing requirements between IOC and PLC (typically ~1 second is
adequate) and we can tolerate a long timeout (several seconds).
Anything with lower tolerance is handled within the PLC (or within
the IOC). With this expectation, we do not see anything like your
flicker, and when we have seen problems, it has generally been
traced to a buggy firmware version on the PLC or bad hardware (e.g.
damaged network cable). The SNS network is relatively flat and has
lots of traffic. A dedicated network may be beneficial, but I think
in our case, the inefficient network protocol to the AB PLCs is more
of a limitation then the network capacity. I don't have experience
with the S7 PLCs for comparison.
Regards,
--
Steven Hartman
[email protected]
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ANJ, 18 Nov 2013 |
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