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Maintenance
840 USE 106 00 January 2003 201
10.5 Testing
Forcing a Switchover
Testing a Hot
Standby
Switchover
To test your Hot Standby system, you may force a switchover manually or through
software.
Forcing a
Switchover
Manually
Take the following steps to force a switchover manually.
Note: In systems with scan times of 200 ms or greater and more than 15 RIO
drops, it is recommended that the drop holdup time be increased to 1.5 seconds to
ensure that communication with remote drops is maintained during switchover.
Step Action
1 Be sure that the Standby controller has been fully programmed.
2 Place the function keyswitch on the CHS 110 Hot Standby module in the Run
position.
3 Observe that the Standby indicator on the CHS 110 module is steady amber.
4 Be sure that the designation slide switch on one Hot Standby module is in
position A and that the switch on the other Hot Standby module is in position B.