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Controller log, Controller logging in enhanced redundancy systems, Use programming to monitor system status – Rockwell Automation 1756-RMxx ControlLogix Enhanced Redundancy System User Manual User Manual

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190

Rockwell Automation Publication 1756-UM535D-EN-P - November 2012

Chapter 8

Monitor and Maintain an Enhanced Redundancy System

Controller Log

A controller log is the record of changes. The log is stored on the controller’s

NVS memory automatically. You can store the log to a CF card or SD card on an

as needed basis or automatically at predefined times. The controller’s NVS

memory and each external memory card type have a maximum number entries

they can store.

Specific events are stored in the controller’s log.

For more information on controller logging, see Logix5000 Controllers

Information and Status Programming Manual, publication

1756-PM015

.

Controller Logging in Enhanced Redundancy Systems

Because enhanced redundancy systems operate with partnered controllers, there

are considerations you must consider with regard to controller logging:

The primary and secondary controllers maintain separate logs.

You do not need to synchronize the logs.

On the primary controller, controller logging occurs exactly as it does on a

controller in a nonredundant system, regardless of whether the system is

qualified and synchronized or disqualified.

A secondary controller logs the removal or insertion of removable storage

components, that is, a CF or SD card, in any operating state. Otherwise,

the secondary controller only logs events that occur when the controller is

in a disqualified state.

Use Programming to Monitor

System Status

IMPORTANT

When programming your enhanced redundancy system, program so your
redundancy system status is continually monitored and displayed on your

HMI device.
If your redundancy system becomes disqualified or a switchover occurs, the
change in status is not automatically annunciated. You must program the

system to communicate the change in status via your HMI or other status-
monitoring device.
For more information and programming techniques, see

Program to Obtain

System Status on page 168

.