User's Manual

28 Rockwell Automation Publication 440G-UM004C-EN-P - August 2020
Chapter 6 Device Status and Troubleshooting
Diagnostic/Fault Codes
When connected in a GuardLink system, the 440G-MZ safety switch
communicates information about its current state with diagnostic and fault
codes.
Diagnostic codes (Table 12
) warn that a condition exists which prevents the
switch from transitioning to the operational state (for example, the switch is a
unique coded switch that must be commissioned), or causes the switch to fault
(for example, the input voltage is approaching the minimum value) if not
addressed.
Fault codes (Table 13 on page 29
) provide information about why the switch is
in the faulted state (as indicated by the DEVICE status indicator flashing red.)
When a fault is present, perform the recommended action, if stated. Issue a
RESET command to the 440G-MZ safety switch over the link to clear the fault.
Diagnostic Codes
IMPORTANT When a Power to Lock switch faults in the locked position, the bolt retracts
and the switch unlocks.
Table 12 - Diagnostic Codes
Decimal
(Hex)
Description Recommended Action
00 (00) No diagnostic No action required.
04 (04)
Input voltage is approaching
minimum (20.4V DC)
Evaluate input voltage. Input voltage must be 20.4…26.4V under all
electrical load conditions.
31 (1F) Ready to lock
A lock command has been sent to the device but the guard door is open
or ajar. Check the actuator alignment or close the guard door.
32 (20) Device is attempting to lock
Check actuator alignment. Check the wiring for the lock feedback
input.
33 (21)
Device is attempting to
unlock
Check for load on actuator or bolt. Check the wiring for the lock
feedback input.
38 (26) Actuator not paired
Unique coded switch has not been paired with an actuator yet. Insert a
unique coded actuator (Cat. No. 440G-MZAU) to start the
commissioning process.
40 (28) Guard door open
The actuator is not detected (RFID is not present). Close the guard door
to lock.