Reliance Electric Industrial CONTROLS Instruction Manual

2022-07-04

●Overview:
▲The following is the description of how redundancy is implemented. There will be an active rack and a standby rack. In each rack, there may be up to four Redundancy Processor to link them together. At the end of each scan the AutoMate(s) will transfer selected data to the Redundancy Processor which will then transfer it over the coax to the standby rack. The standby unit will monitor the ready relay on the active unit. If the ready relay on the active unit ever drops out the standby unit will take over control of the system.
▲All I/O used in a Redundant system must be remote mounted. The RIOP in the standby unit is only listening to the network to keep track of which nodes are present. When the standby unit becomes active, it then becomes the master of the remote I/O network.
▲To support RNET in this system, one RNET card is used in the active rack and one RNET card is used in the standby rack. Both cards are connected to the network as normal. The node number that is set on the front of the RNET card needs to be the same for both units. The RNET in the standby rack will then add one to its node number. If, for example, both cards are set up to be node 1, then the active unit will be node 1 and the standby unit will be node 2. When the standby rack becomes active, it will change its number back to node 1. In this way the active unit will always be node 1. Care needs to be taken when assigning node numbers for the system to leave two nodes for every rack that is redundant.

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English Chinese Chinese and English Japanese

Novermber 1985

J-3038PA

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