The shutdown of the safe sensor cascade is indicated on the safety controller by the
LED for the input; this LED is off. The shutdown or the error occurred on the first Flexi
Loop node in the direction of propagation on which the MS LED is no longer flashing
green at 1 Hz.
9.3.2
LEDs of the EMSS Flexi Loop nodes
Figure 61: LEDs of the EMSS Flexi Loop nodes
EMSS1/2
MS
Meaning
Green
–
Switch contact 1 or 2 on the safety switch closed, no
error
–
Switch contact 1 or 2 on the safety switch open, no
error
Green
Red
Discrepancy or sequence error, related switch con‐
tact is closed.
Green
Red
Discrepancy or sequence error, related switch con‐
tact is open.
Table 30: EMSS LEDs and MS LED of the EMSS Flexi Loop nodes
•
If an error is only indicated on one of the LEDs EMSS1 or EMSS2 (the other is
either illuminated green or is off), then there is a discrepancy error.
•
If an error is indicated on both LEDs EMSS1 and EMSS2, there is a sequence
error.
AUX_IN (8-pin var‐
iant only)
Meaning
Green
Non-safe input is active.
Non-safe input is inactive.
Table 31: AUX_IN LED of the EMSS Flexi Loop nodes
AUX_OUT (8-pin
variant only)
Meaning
Green
Non-safe output is active.
Non-safe output is inactive.
Table 32: AUX_OUT LED of the EMSS Flexi Loop nodes
TROUBLESHOOTING
9
8015836/YT10/2016-05-24 | SICK
O P E R A T I N G I N S T R U C T I O N S | Flexi Loop
71
Subject to change without notice