
Rockwell Automation Publication 440G-UM001A-EN-P — November 2013 27
Description of Operation Chapter 4
Troubleshooting Series
Circuit
Unit Response Times When
Connected in Series
Green
Pink
Grey
Red
Yellow
White
Green
Pink
Grey
Red
Yellow
White
Green
Blue
Pink
Grey
Brown
Red
Yellow
White
Green
Pink
Grey
Red
Yellow
White
Green
Pink
Grey
Red
Yellow
White
Blue
Blue
Blue
Blue
Brown
Brown
Brown
Brown
+24V +24V
+24V +24V
0V0V
0V
0V
0V
0V
RTN
24V DC
Power
Supply
+24
1606-
XL120D
Lock/Unlock Lock/UnlockLock/UnlockLock/UnlockLock/Unlock
Recoverable
Fault
Actuator 1 is in sensing range
and guard is locked.
Guard 1 functions properly.
OSSDs are energized to 24V.
Green LED is ON.
Actuator 2 is in sensing range
and guard is locked.
Guard 2 functions properly.
OSSDs are energized to 24V.
Green LED is ON.
Actuator 3 is in sensing
range and guard is locked.
Guard 3 has a fault.
See Diagnostic table.
Red LED is ashing.
Actuator 4 is in sensing range
and guard is locked. Guard
4 functions properly. Series
inputs are 0V. OSSDs are
de-energized to 0V. Green
LED is ashing to indicate
series inputs are not 24V.
Actuator 5 is in sensing range
and guard is locked. Guard 5
functions properly.
Series inputs are 0V. OSSDs
are de-energized to 0V. Green
LED is ashing to indicate
series inputs are not 24V.
OSSDs
are OFF
Switch 1 Switch 2 Switch 3 Switch 4 Switch 5
Actuator 1
Actuator 2
Actuator 3
Switch 1
Switch 2
Switch 3
RTN
24V DC
Power
Supply
+24
1606-
XL120D
Green
Pink
Grey
Brown
Red
Yel
White
A2
440R-N23132
Initial Conditions:
All switches are
locked
Switch 1 receives
Unlock command
(guard can then
be opened).
Lock/unlock
command
Switch 2 drops the 24 volts
(red and yellow) from
switch 1 OSSD outputs.
Green LED ashes.
Switch 3 drops the 24 volts
(red and yellow ) from
switch 3 OSSD outputs.
Green LED ashes.
Pink
Grey
Red
Yel
White
Green
Blue
Pink
Grey
Red
Yel
White
S11 41332313S12S52
S21 S22 42342414A1S34
200 ms150 ms100 ms0 ms
650 ms625 ms600 ms0 ms
Switch 1 guard is
closed
Switch 1 OSSD
outputs are
energized.
Switch 2 OSSD inputs (red
and yellow) transition to
24V DC from switch 1 OSSD
outputs. Switch 2 OSSD
outputs are energized.
Switch 3 OSSD inputs (red
and yellow) transition to
24V DC from switch 2
OSSD outputs. Switch 3
OSSD outputs are energized.
Green
Brown
Blue
Brown
Blue
Switch 1
Switch 2
Switch 3
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