Table of Contents
Advertisement
B-8
ControlNet Overview
Publication CNET-UM001C-EN-P - November 2005
Understand the Network Keeper
Every ControlNet network requires at least one module that stores
programmed parameters for the network and configures the network with
those parameters at start-up. This module is called a "keeper" because it keeps
the network configuration. RSNetWorx for ControlNet software configures
the keeper.
To avoid a single point of failure, ControlNet supports multiple redundant
keepers. The following ControlNet communication modules are keeper cable
devices:
• 1756-CN2(R) modules
• 1756-CNB(R) modules
• 1769-L32C and 1769-L35CR controller
• 1784-PCICS and 1784-PKTCS cards
• 1788-CNx cards
• PLC-5C module
On a multi-keeper network, any keeper capable module can keep the network
at any legal node address (01 to 99). The multi-keeper capable node with the
lowest node address becomes the active keeper provided it is valid. It has been
configured by RSNetWorx software and that configuration is the same as that
of the first keeper that became active after the network was formed or
reconfigured by RSNetWorx software.
If the active keeper is taken off the network, a valid back-up keeper can take
over for it and continue to act as keeper. As long as at least one valid
multi-keeper device is present on the network, new scheduled connections can
be established.
Hide quick links:
Advertisement
Table of Contents
