Connecting Two Premium Hot Standby PLCs
Original instructions
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Overview
To work properly, the primary and standby PLCs must be linked in a specific way.
Which Connections Are Required?
CAUTION
IMPROPER SYSTEM BEHAVIOR
To prevent double primary PLCs when the two links are broken, route the two cables as far away from each other as possible.
Failure to follow these instructions can result in injury or equipment damage.
Two sync link connections are required between the two Premium Hot Standby PLCs:
If these two links do not work properly, the two PLCs function as standalone units.
Which Cables May be Used?
The following cable type may be used in sync link connections: