M580 Hot Standby System Diagnostics in Control Expert

Introduction

Control Expert provides M580 Hot Standby System diagnostic information in the following GUI screens:

Hot Standby Status Viewer

When Control Expert is connected to the Hot Standby system, it displays the Hot Standby status of each PAC, including:

The status of CPUs A and B.
The comparative state of logic running in the standby PAC.
If a logic mismatch exists, the number of modifications made to the application running in the primary PAC.

The Hot Standby Status Viewer looks like this:

Hot Standby status

Number of changes

The status values for PACs A and B include:

Also presented is the logic state of the standby PAC, which can be either:

EQUAL (green background): There is no logic mismatch.
DIFFERENT (red background): Online changes have been made to the primary PAC application that have not been transferred to the standby PAC.

Hot Standby Information Tab

Use the CPU Configuration window Animation → Information tab to view the status of the Hot Standby system:

The Information tab contains one word of status data, as follows:

Hot Standby status of the local PAC: Primary Standby Stop Wait	Local PAC name (position of A/B/Clear rotary switch): PLC A PLC B CLEAR
Hot Standby status of the remote PAC: Primary Standby Stop Wait	Remote status valid: True False
Application mismatch status: Equal Different	Hot Standby system valid: True False
Logic mismatch status: Equal Different	–