1785-UM022B-EN-P - February 2002
Planning to Use Your ControlNet PLC-5 Processor 2-33
Distributed Keeper Functionality
All ControlNet processors now keep the ControlNet configuration.
The processor with the lowest node address acts as the master keeper,
while the other processors serve as backups. If the master keeper
drops off the network, the next-lowest numbered processor takes over
as the master keeper. No user intervention is required.
Important: ControlNet PLC-5 programmable controllers with
firmware revision E/B, D/C, or C/L are single keeper devices.
All later releases are distributed keeper devices.
There are two rules you must follow when combining single keeper
devices and distributed keeper devices on the same network:
• if there is a single keeper device at node 1, there can be no
distributed keeper devices on the network
• if there are distributed keeper devices on the network, single
keeper devices can also be allowed on the network. However,
there cannot be a single keeper device at node 1.
If you plan to have distributed keeper devices on the network, we
recommend that you flash upgrade the single keeper devices to be
distributed keeper devices.
When used in a Class I, Division 2, hazardous
location, this equipment must be mounted in a
suitable enclosure with proper wiring method that
complies with the governing electrical codes.
WARNING
!
AB Drives
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