Schneider Electric 840 USE 106 0 manual Reverse Transfer Logic Example

Using a Quantum 984 HSBY System

Reverse Transfer Logic Example

A Reverse	The following example shows I/O ladder logic for a Primary controller that monitors
Transfer Logic	two fault lamps and the reverse transfer logic that sends status data from the
Example	Standby controller to the Primary. One fault lamp turns ON if the Standby memory
	protect is OFF; the other lamp turns ON if the memory backup battery fails in the
	Standby.
	Network 1 of Segment 1
		400005
		400100
		CHS
		30

Network 2 of Segment 1
			BLKM transfers the status of the
	400103
			Hot Standby status register
	000801		(40103) to internal coils (00801)
	BLKM
	#001
					STAT sends one register Word from
				400101
					the standby to a reverse transfer
				STAT	register (400101 in the primary.
000815		000816		#001
	(Bit 15)	(Bit 16)

(Enables STAT if this PLC is the Standby

840 USE 106 00 January 2003 83