Title
M580 Hot Standby CPU DDT Diagnostics

Issue
M580 Hot Standby CPU DDT Diagnostics

Product Line
M580

Environment
Unity Pro

Resolution
The Hot Standby DDT Data Structure has boolean variables available to determine if the Primary or Standby is running or if PLC has failed.
The Hot Standby DDT Data Structure - The T_M_ECPU_HSBY DDT is the exclusive interface between the M580 Hot Standby system and the application running in a BMEH58•040 CPU.
The DDT instance should appear as: ECPU_HSBY_1. There are several elements that give you system information
The M580 Hot Standby T_M_ECPU_HSBY_STS Data Type presents the following elements under the LOCAL_HSBY_STS and REMOTE_HSBY_STS:

RUN_PRIMARY
True: The PAC is in primary state.
False: The PAC is in standby, wait or stop state.

RUN_STANDBY
True: The PAC is in standby state.
False: The PAC is in primary, wait or stop state.

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