Rockwell Automation 1756-RMxx ControlLogix Enhanced Redundancy System User Manual - Manual (Page 169)

Rockwell Automation Publication 1756-UM535D-EN-P - November 2012 169
Program the Redundant Controller Chapter 7
In the example below, the GSV instruction is used to obtain the chassis ID (that
is, the chassis A or B designation) of the chassis that is functioning as the primary.
The PhysicalChassisID value is stored in the PRIM_Chassis_ID_Now tag. The
PhysicalChassisID value retrieved matches the Chassis ID indicated in the
Controller Properties dialog box.
Figure 51 - GSV Instruction to Get Chassis ID
For more information about the REDUNDANCY object attributes, see
Appendix E , Redundancy Object Attributes on page 273 .
If the Physical Chassis ID value is Then the chassis ID is
0 Unknown
1 Chassis A
2 Chassis B
Chassis ID in Controller
Structured Text
Ladder Logic