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Using a Quantum 984 HSBY System
88
840 USE 106 00 January 2003
Bits in the Hot Standby Command Register
Specifying the
Command
Register
The command register is used to control various parameters of the Hot Standby
system.
Command
Register
The command register is specified in the first entry field of the Hot Standby dialog.
By default, the command register is set to 400001. If register 400001 is used
elsewhere, enter another number greater than 0. The number you enter becomes
the 4x command register. For example, if you enter 14, the hot Standby command
register is 400014.
You may enter any number in the range 1... n, where n is the last configured 4x
register. However:
The command register must be part of the area of state RAM that gets transferred
from the Primary to the Standby controller on every scan.
Disables keyswitch override = 0
Enables keyswitch override = 1
Sets Controller A to OFFLINE mode = 0
Sets Controller A to RUN mode = 1
Sets Controller B to OFFLINE mode = 0
Sets Controller B to RUN mode = 1
Forces standby offline if there is a logic mismatch = 0
Does not force standby offline if there is a logic mismatch = 1
Allows exec upgrade only after application stops =0
Allows exec upgrade without stopping application =1
0 = Swaps Modbus port 1 address during switchover
1 = Does not swap Modbus port 1 address during switchover
0 = Swaps Modbus port 2 address during switchover
1 = Does not swap Modbus port 2 address during switchover
0 = Swaps Modbus port 3 address during switchover
1 = Does not swap Modbus port 3 address during switchover