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GFK-1527A Chapter 4 Normal Operation 4-9
4
The configured Fail Wait time for the system must be based on the maximum expected or
allowable difference in the two CPUs reaching a synchronization point. For example, if one CPU
might spend 20ms in the communications phase of the sweep and the other unit might spend 95ms
in communications in the same sweep, the Fail Wait time must be set to at least 80ms (80 > 95 -20)
to prevent accidental loss of synchronization. Differences in the logic execution window or other
phases must also be considered when selecting a Fail Wait time. Some applications limit the
possible difference during the communications window by using Constant Sweep mode or
Constant Window mode, or by setting the system communications window to LIMITED and
selecting a small window time.