Node LEDs 1 to 32
MS LED
Meaning
Red
–
Sequence error occurred on the node
Red
–
Discrepancy error occurred on the node
Green (2 Hz)
Red/green (2 Hz)
Node found, corresponds to expected configu‐
ration
Red/green (2 Hz)
Red/green (2 Hz)
Node found, but does not correspond to the
configured type or the number of nodes config‐
ured has been exceeded.
Red (2 Hz)
Red/green (2 Hz)
Configured node not found
Red/green (1 Hz)
Green (0.5 Hz)
Node found, but safe sensor cascade inter‐
rupted (cable break detected).
If multiple LEDs are flashing: The connection
has probably been interrupted downstream of
the Flexi Loop node whose LED is the last one
flashing.
Red (node 1)
Green (0.5 Hz)
Number of Flexi Loop nodes allowed not
reached
Red (node 32)
Green (0.5 Hz)
Number of Flexi Loop nodes allowed exceeded
Table 41: Node LEDs of the MSTR1 and MSTR2 Flexi Loop accessory
Operating mode LED
Meaning
No operating voltage, or voltage too low
Green
Compatible safety controller detected, safe sensor cascade in
operation
Orange
Safety controller found, compatibility test in progress
Red
No safety controller found
Red
Configuration required
Red/green
Configuration process in progress, please wait
Green
Configuration saved successfully, reboot required
Table 42: Operating mode LED of the MSTR1 and MSTR2 Flexi Loop accessories
IO-Link LED
Meaning
Standard IO mode
Green
IO-Link mode, connection established to the IO-Link master
Orange
IO-Link in Pre-operate modus
Red
Error occurred in the IO-Link communication
or:
IO-Link output stage overloaded
Table 43: IO-Link LED of the MSTR2 Flexi Loop accessory
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
75
Subject to change without notice