Schneider Electric 840 USE 106 0 manual Specifying the Command Register, Standby Command Register

Using a Quantum IEC Hot Standby System

Specifying the Command Register

Bits in the Hot The command register controls various parameters of the Hot Standby system.

Standby

Command

Register

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 (Supported only with Concept 2.5 or higher)

Allows exec upgrade only after application stops = 0 Allows exec upgrade without stopping application = 1 (Supported only with Concept 2.5 or higher)

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
	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.
Specify
	The command register is specified in the first entry field of the Hot Standby dialog.
Command	By default, the command register is set to 400001. If register 400001 is used
Register	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.

118 840 USE 106 00 January 2003