Manage Controller Communication
Controllers use connections in a control system. Connections are used when the system contains these conditions:
- I/O modules, communication modules, and adapters are present in the I/O configuration of the user project.
- Produced or Consumed tags are configured in the user project.
- Connected Messages are executed in the user application.
- External devices, programming terminals, or HMI terminals communicate with the controller.
CIP Security Considerations
If you use I/O data security (
CIP Security™
) for safety I/O, the maximum number of nodes supported is reduced as follows: - Number of non-secure nodes + 2 * (number of secure nodes, integrity only) + 4 * (number of secure nodes, integrity, and confidentiality) <= 150
or
- Maximum nodes supported by the controller, whichever is less.
If you do not use secure connections, the controller catalog number dictates the maximum number of nodes.
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