
Table 2: Error messages / flash codes red diagnostic LED
Flash codes (red) Designation Autonomous switch-off after Error cause
1 flash pulse Error (warning) at output Y1 30 min Fault in output test or voltage at
output Y1, although the output
is disabled.
2 flash pulses Error (warning) at output Y2 30 min Fault in output test or voltage at
output Y2, although the output
is disabled.
3 flash pulses Error (warning) cross-wire short 30 min Cross-wire short between the
output cables or fault at both
outputs
4 flash pulses Error (warning) temperature too
high
30 min The temperature measurement
reveals an internal temperature
that is too high
5 flash pulses Actuator fault 0 min Incorrect or defective actuator
6 flash pulses Error actuator combination 0 min An invalid combination of
actuators was detected
(blocking bolt detection or
tamper attempt).
Continuous red signal Internal fault / overvoltage or
undervoltage fault
0 min Device defective /
supply voltage not within
specifications
6.5 Solenoid interlock with serial diagnostic function SD
Solenoid interlocks with serial diagnostic cable have a serial input and output cable instead of the conventional
diagnostic output. If solenoid interlocks are wired in series, the diagnostic data are transmitted through the series-
wiring of the inputs and outputs.
Max. 31 solenoid interlocks can be wired in series. For the evaluation of the serial diagnostics line either the
PROFIBUS-Gateway SD-I-DP-V0-2 or the Universal-Gateway SD-I-U-... are used. This serial diagnostic interface is
integrated as slave in an existing field bus system. In this way, the diagnostic signals can be evaluated by means of
a PLC.
The necessary software for the integration of the SD-Gateway is available for download at products.schmersal.com.
The response data and the diagnostic data are automatically and permanently written in an input byte of the PLC
for each solenoid interlock in the series-wired chain. The request data for each solenoid interlock is transmitted to
the component through an output byte of the PLC. In case of a communication error between the SD-gateway and
the solenoid interlock, the switching condition of the solenoid interlock is maintained.
Error
Errors which no longer guarantee the function of the safety switchgear (internal errors) cause the safety outputs to
be disabled within the duration of risk. The fault is reset, when the cause is eliminated and bit 7 of the request byte
changes from 1 to 0 or the safety guard is opened. Faults at the safety outputs are only deleted upon the next
release, as the fault rectification cannot be detected sooner.
FAutomatic, electronic locking takes place if more than one fault is detected at the safety outputs or a cross circuit is
detected between Y1 and Y2. This means that normal fault acknowledgement is no longer possible. To reset this type of
interlock, the solenoid interlock must be isolated from the supply voltage after elimination of the error causes.