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Using a Quantum IEC Hot Standby System
118
840 USE 106 00 January 2003
Specifying the Command Register
Bits in the Hot
Standby
Command
Register
The command register controls various parameters of the Hot Standby system.
Specify
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.
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 on switchover
0 = Swaps Modbus port 2 address during switchover
1 = Does not swap Modbus port 2 address on switchover
0 = Swaps Modbus port 3 address during switchover
1 = Does not swap Modbus port 3 address on switchover
(Supported only with Concept 2.5 or higher)
(Supported only with Concept 2.5 or higher)
Note: Bit 16 in Modicon convention (shown in the diagram above) is bit 0 in IEC
convention. Setting bit 16 means writing a 0x0001 into the command register.