Fault
Responses
Causes
Output voltage level is
High instead of Low
when the output is
“Off”
3)
•
All safety outputs of the module
are switched off
•
Output voltage supply
process data
status bit = 0
4)
•
Status Qx short-circuit to High
process data status bit = 0
•
Status Qx short-circuit to High
mod‐
ule status bit = 0
•
Short-circuit to other volt‐
age-carrying line
Test pulses are not
detected correctly
when the output is
“On”
3)
5)
•
Short-circuit to other volt‐
age-carrying line
•
Capacitive load too high
Internal error detected
•
Safety controller switches to the
critical error status
•
Internal error
module status bit = 0
•
Internal device error
•
Capacitive load too high
1)
Depending on the voltage supply used, an overcurrent can also result in the voltage supply dropping out.
2)
Reset of the error: set the process data bit of the safety output to 0.
3)
Reset of the error: the process data bits for all safety outputs of the module are simultaneously 0 and the
output level is Low.
4)
In the case of a High instead of a Low on a safety output, the supply to all safety outputs is switched off
internally. If the cause of a short-circuit is in the wiring to 24 V, then the affected signal remains High and
all other signals switch to Low.
Check if this is an undesired but valid signal value for the receiver, e.g., for the switching of the
monitoring case of a SICK safety laser scanner by means of a complementary signal.
5)
Depending on the size of the capacitive load, this may lead in certain cases to an incorrect interpretation
as an internal error since the effect on the output voltage is only temporary.
Table 135: Faults in the test outputs (X)
Fault
Responses
Causes
Voltage supply A1 / A2
for the test outputs is
lower or higher than
the operating range
See voltage supply A1 / A2 of the main module. The test outputs are
supplied from the voltage supply of the main module.
Output voltage level
is Low instead of
High when “On”, over‐
load/overcurrent
1)
•
Associated output/associated
output pair are switched off tem‐
porarily (thermal overload limit‐
ing).
•
No status indicator or diagnostic
message available for this fault.
•
Short-circuit or resistance
drop under load
•
Short-circuit to another line
e.g., GND
Output voltage level is
High instead of Low
when “Off”
•
No status indicator or diagnostic
message available for this fault.
•
Short-circuit to other volt‐
age-carrying line
1)
Depending on the voltage supply used, an overcurrent can also result in the voltage supply dropping out.
Critical error status
Consequences of the critical error status:
•
All applications are stopped.
•
All safety outputs are switched off.
•
All process data = 0
•
Evaluation of the process data status bits in the logic is no longer possible.
•
Only limited diagnostics can be performed in the critical error status.
Alternatives to resetting the critical error status:
•
Restart by switching the voltage supply off and on again
•
Software reset using the configuration software
Complementary information
The status indicators and diagnostic messages may provide additional information.
TROUBLESHOOTING
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8024589/2020-11-10 | SICK
O P E R A T I N G I N S T R U C T I O N S | Flexi Compact
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Subject to change without notice