170 HC900 Process & Safety Controller User and Installation Manual Revision 6
21 April 2017
Manual Failover
Via Key Switch on the Redundancy Switch Module in the Redundant Controller Rack. When doing
manual failover with keyed switch, turn key to Failover and hold it there until both Reserve lights are
on, then release the key.
Via Software Command from HC Designer & HC Utilities PC Software
Via Software Command from Modbus / TCP & Serial Modbus RTU Hosts
Via Software Command from 900 Control Station.
Via input to RSTAT Function Block to initiate failover (User can configure logical conditions such as
loss of communication handshake between Host and Controller to initiate failover).
Failover Performance
Failure condition detection and failover from Lead to Reserve CPU executed in 4 analog control cycles or
less.
Redundancy Diagnostic Monitoring
From HC Designer and HC Utilities PC Software
Redundant System Status - current status of Lead/Reserve Controller CPU’s
On-Line Monitoring, Controller Diagnostics, Communications Loop-Back tests
Redundant Link Status – status of communications between Lead and Reserve controllers.
Lead CPU status
Reserve CPU status
Scanner status
File Download/Upload Functions
See page 163.
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