CIP Safety Systems and Safety Network Numbers

CIP Safety
control systems are composed of
CIP Safety
devices that are interconnected via communication networks. These networks consist of devices, such as bridges, switches, routers, adapters, and redundancy modules, which may not be SIL 2 or SIL 3 certified. The secure transmission of safety-related data through standard infrastructure devices is known as black channel communication.
CIP Safety
devices must be inherently protected from network delivery errors. The
CIP Safety
protocol is an end-node to end-node safety protocol. This configuration allows the routing of
CIP Safety
messages to and from
CIP Safety
devices through non-certified bridges, switches, routers, adapters, and redundancy modules.
For more information about
CIP Safety
functionality and related concepts, see the following:

Unique Node Reference

A key element of the
CIP Safety
protocol is the concept of a Unique Node Reference (also called Unique Node ID or UNID). Every
CIP Safety
device must have a UNID value that is assigned to each
CIP Safety
-capable port.
IMPORTANT: It is your responsibility to make sure that all UNIDs are unique within the scope of all devices that could possibly communicate with each other.
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