Allen-Bradley 1756-CNB User Manual page 161

If Timer_RedundancyMSGs.DN = 1 (2 seconds are up.)
And ChasB_IsPrimary = 1. (Chassis B is the primary chassis.)
And ChasB_MSG.EN = 0 (The message is not currently enabled.)
Then
Execute the MSG instruction for the controller in Chassis B.
Tag Name
ChasA_IsPrimary
ChasA_MSG
ChasB_IsPrimary
ChasB_MSG
Description
If set (1), then Chassis A is the primary chassis.
Message instruction that transfers data between this
controller and the controller in redundant Chassis A.
If set (1), then Chassis B is the primary chassis.
Message instruction that transfers data between this
controller and the controller in redundant Chassis B.
Set Up EtherNet/IP Communication Across Subnets
Alias For
IsPrimary.0
IsPrimary.1
Publication 1756-UM523F-EN-P - December 2006
161
Data Type
BOOL
MESSAGE
BOOL
MESSAGE