Learning RSLogix 5000 Programming

Faults

Within Logix, there are four categories of faults:

• Major: This fault is a fault in which the Logix controller will stop executing routines. An I/O module will allow you to configure the program to enter either a fault mode or program mode when a major fault occurs. Also, the I/O module outputs are set to their configured value for the faulted mode. There are 77 different types of major faults listed in the Rockwell Automation Literature Library document, "Logix5000 Controllers, Major, Minor, and I/O Faults", for example, when the controller detects a problem with the chassis, a major fault will be triggered.
• Minor: This fault will trigger a bit to go high in the MinorFaultBits system status class object, but the controller will continue to ...