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Using a Quantum 984 HSBY System
840 USE 106 00 January 2003 81
The Hot Standby Status Register
Hot Standby
Status Register
The status register is register 40012, the third register in the nontransfer area. The
command register, which is defined in the top node, has been placed outside the
nontransfer area, as required.
The third register in the nontransfer area is the status register. Use this register to
monitor the current machine status of the Primary and Standby controllers.
Bits in the Hot
Standby Status
Register
In the example, the status register is 40012.
This PLC in OFFLINE mode = 0 1
This PLC running in primary mode =1 0
This PLC running in standby mode = 1 1
The other PLC in OFFLINE mode = 0 1
The other PLC running in primary mode =1 0
The other PLC running in standby mode = 1 1
PLCs have matching logic = 0
PLCs do not have have matching logic = 1
This PLC’s switch set to A = 0
This PLC’s switch set to B = 1
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