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:- ODVA website at https://www.odva.org
- CIP Safety: Safety Networking for Today and Beyond White Paper, publication SAFETY-WP038
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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