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gromit

SLC5/05 data link timeout alarms

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When communicating between SLC5/05 and a third party, we are receiving sporadic timeout alarms...by sporadic, I mean it could be hours to days apart.
The program scan time is very short…only 20 msec maximum & 10 msec average.
Do you have any suggestions for resolving this issue?

Also, is there a way to determine communication rate or communication scan time?

Thanks!

Edited by gromit

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A-B PLC scan time & Ethernet/IP network availability go hand-in-hand.  The problem, most likely, is not the PLC scan time but the network availability.  Is the control LAN separated from the company LAN?  How many devices reside on the control network?  How "tight" is the control network (a loose control network design can afford significant latency delays)?

WireShark is a free IP Network Analyzer tool.  I would suggest plugging into the control network, turn off all ports not directly connected (such as Wireless), let WireShark run, research what results you are given.  Broadcast traffic, typical A-B processors are known to generate, are often the main culprit.

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