Maxiflex P3 PAC User Manual
108
-© Omniflex
UMM126XR18.pdf
14.13 Step 13: Check Active and Standby Status of the Redundant System
At this stage, the Primary Controller should be active
– indicated by the RUN LED on the
Primary CPU on steady, and the Secondary Controller should be in Standby, indicated by the
RUN LED on the secondary controller flashing.
14.14 Step 14: Test Fail Change-over
You can test the fail change-over from primary to secondary controller in a number of ways:
1. Power down the Primary Controller, OR
2.
Unplug the Remote I/O cable from the Primary Controller’s RIO NIM.
You can tell always tell which controller is active, because its RUN LED will be on steady.
The RUN LED on the standby controller will be OFF if the controller is not ready to run, or
flashing if it is in standby
– ready to run.
NOTE: Unplugging the Sync Link cable will not cause a change over from primary to
secondary.
14.15 Step 15: Test Force Change-over
It is possible to force a changeover from software. This allows changeover to be tested
externally without interfering with any of the hardware.
This Force function can be invoked through any of the communications ports. This will allow
this test function to be included as part of a Supervisory Computer design if necessary.
To test this function using Omniset follow this procedure:
1.
Plug the programming cable into the Primary Controller’s Prog Port
2. Confirm that the Primary is Active, and the Secondary is in Standby:
3.
Change “Force Primary Failure” from False to True.
