Schneider Electric 840 USE 106 0 manual Reverse Transfer Registers

Using a Quantum 984 HSBY System

The Reverse Transfer Registers

Reverse Transfer You can use the reverse transfer registers to transmit diagnostic data from the Standby controller to the Primary controller. When you choose to define a nontransfer area, registers 4x and 4x + 1 in the nontransfer block are copied from the Standby to the Primary controller. This is opposite from the normal forward state table transfer from the Primary to the Standby.

If you choose not to use the reverse transfer registers, do not connect the CHS bottom input to the rail in your ladder logic program, so the inputs to these registers are not enabled.

82 840 USE 106 00 January 2003