Rockwell-automation Logix5000 Controllers Controller Information and S Manuel d'utilisateur télécharger pdf (Page 12)

Chapter 1 Connections

If the controller loses communication with a module, data from that device does

not update. When this occurs, the logic acts on the data in ways that may or may

not be correct. You can program the controller to manage faults safely and

efficiently.

Outputs respond to the last, non-faulted state of the controlling inputs. To avoid potential injury and

damage to machinery, make sure this does not create an unsafe operation. Configure critical I/O modules to

generate a controller major fault when they lose their connections to the controller, or monitor the status of

I/O modules.

Example: Loss of Communication

Controller B requires data from controller A. If communication fails between the controllers, controller B

continues to act on the last data that it received from controller A.

If communication with a device in the I/O configuration of the controller does

not occur for 100 ms, the communication times out. If this occurs, you have the

following options.

If you want the controller to Then

Fault (major fault) Configure a major fault to occur on page 13.

Continue operating Monitor the health of a module on page 13.

Manage a connection

failure

12 Rockwell Automation Publication 1756-PM015F-EN-P – October 2014

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Rockwell-automation Logix5000 Controllers Controller Information and S Manuel d'utilisateur Page 12