Eaton ESR5-NO-31-24VDC Manual page 34

4 Maintenance
LED
Power IN 1/2 K1 K2
● ● ● ○
Legend: ○ – LED off, ● – LED on
31
State
The sensor circuit is active. The
reset/start circuit (S34) is/was
activated. The safety circuit (K1
and K2) does not pick up.
The sensor circuit is active. The
reset/start circuit (S34) is/was
activated. The safety circuit (K2)
does not pick up.
ESR5-NO-31-24VDC 11/23 MN049018EN Eaton.com
Possible cause
Possible short circuit in sensor circuit S21
and S22.
External error.
The sensor circuit channels were not both
opened / requested.
Internal error:
Diagnostics active.
Remedy
Turn off the operating voltage and fix the
short-circuit. Then carry out a functional
test.
External error: 
Check whether the second channel is
opened with the sensor's request.
Internal error: 
Perform a power-down reset followed by
a function test. If the error occurs
again after the function test, replace
the device.