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Old June 27th, 2008, 08:09 AM
rezabejd's Avatar
rezabejd rezabejd is offline
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Join Date: Dec 2003
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I think it will depend on your system. Since the "Link Master" - typcally the DCS H1 card - sets the macrocycle and communicates the schedule to all the devices, there is going to be a lapse of one kind or another when you change the cycle time. All of the devices are getting a partial download. What they do when that happens depends on your host system and how you have configured your devices.

On a critical loop, I think I would either wait for a process outage, or at a minimum put the control valves on bypass or handwheel. I would also consult with a specialist at my host vendor and see what they think is likely to happen.
John Rezabek, Process Control Specialist
Ashland, Inc. Lima Site, 1220 S Metcalf St, Lima, OH. 45804 USA
Chairman, FF EUAC


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