Rockwell Automation 440N SensaGuard Magnetically Coded NonContact Switch (MC2) - Manual (Page 6)

5. LED Operation and Diagnostic
Unit Indicators (per IEC 60073)
State Status Troubleshooting
Off Not Powered Check supply, check wiring to controller A
Device Output Off Overload Check AUX connections
LED Red Actuator not present If actuator present check misalignment.
Green Actuator Present NA
Green Actuator Present Check wiring to controller
flashing Actuation not present on other Check actuators on other switches
switches or wiring fault
6. Troubleshooting
72697 Issue 4 EO: 28485
6 Magnetically Coded Non Contact Switch Installation Instructions
Note: Refer to Technical Specifications for Certification information and ratings.
S11
S21
Safety A
Safety B
24V Aux
Safety A
Safety B
24V Aux
Safety A
Safety B
24V Aux
Safety A
Safety B
24V Aux
Safety A
Safety B
24V Aux
S12
S22
LED - Flashing
Green
LED - Red
Aux - ON
LED - Red
Aux - ON
LED - Green
Aux - OFF Aux - OFF
LED - Flashing
Green
Aux - OFF
Aux Aux Aux Aux Aux
6.1 Series Circuit - 2 Guards Open
S11
Open Circuit between two MC2s
S21
Safety A
Safety B
24V Aux
Safety A
Safety B
24V Aux
Safety A
Safety B
24V Aux
Safety A
Safety B
24V Aux
Safety A
Safety B
24V Aux
S12
S22
LED - Flashing
Green
LED - Flashing
Green
Aux - OFF
LED - Green
Aux - OFF
LED - Green
Aux - OFF Aux - OFF
LED - Flashing
Green
Aux - OFF
Aux Aux Aux Aux Aux
6.2 Series Circuit - Open circuit on channel A
The auxiliary contacts close at the same time as the first safety contact opens
The auxiliary contacts close at the same time as the first safety contact opens