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Sigma - Global communications, what happens to the controllers if the network fails?

Issue

What happens to Sigma globals if the network fails?

Environment

Globals

Communications

Networks

Cause

Site is to have a planned network shutdown, how will the Sigma controllers react to this?

Resolution

The Sigma controller using the global update, will continue to operate normally, but will use the last value received, so any changes will not be responded to.

If the Sigma controller controls critical plant then the loss of global communications should be taken into account when programming.

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