Rockwell Automation Logix 5000 Programming Manual

Chapter 2 Minor Faults
28 Rockwell Automation Publication 1756-PM014N-EN-P - March 2022
Use these examples to check for minor faults.
Checks for a low battery warning
Example:
Checks for a minor fault.
Minor_fault_check times for 1 minute (60000 ms) and then automatically restarts itself.
Every minute, minor_fault_check.DN turns on for one scan. When this occurs, the GSV instruction gets the value of the
FaultLog object, MinorFaultBits attribute, and stores it in the minor_fault_bits tag. Because the GSV instruction only runs once
every minute, the scan time of most scans is reduced.
If minor_fault_bits.10 is on, depending on the controller, the battery is low or the ESM or UPS needs to be replaced or is
missing.
Checks for a minor fault that is caused by a specific instruction
Example:
Check for a minor fault that is caused by an instruction.
•
Multiply value_a by 1000000 and check for a minor fault, such as a math overflow.
• To make sure that a previous instruction did not produce the fault, the rung first clears S:MINOR.
• The rung then executes the multiply instruction.
• If the instruction produces a minor fault, the controller sets S:MINOR.
• If S:MINOR is set, the GSV instruction gets information about the fault and resets S:MINOR.
Minor fault examples

Rockwell Automation Logix 5000 Specifications

General

Brand	Rockwell Automation
Model	Logix 5000
Category	Controller
Language	English