Siemens SIMATIC S7 Functional Safety Manual page 127

Event ID Diagnostic mes-
sage
0x0302 Discrepancy fail-
ure,
channel state 1/0
0x0303 Discrepancy fail-
ure,
channel state 1/1
0x0306 Internal sensor
supply
short-circuit
to P
0x0307 Overload or inter-
nal sensor supply
shorted to ground
0x030B Channel failure
acknowledgement
0x0311 Frequency too
high
0x0312 Undertemperature All
S7-1200 Functional Safety Manual
Manual, 02/2015, A5E03470344-AA
Fail-safe signal Description
module
SM 1226 F-DI External discrepancy
16 x 24 VDC failure: Channel state
1/0 with 1oo2 equiva-
lent configuration
SM 1226 F-DI External discrepancy
16 x 24 VDC failure: Channel state
1/1 with 1oo2 non-
equivalent configura-
tion
SM 1226 F-DI SM provided sensor
16 x 24 VDC supply voltage short-
ed to P
SM 1226 F-DI Internal sensor sup-
16 x 24 VDC ply
voltage shorted to M,
ground, or excessive
load on sensor sup-
ply
All Channel configured
for manual acknowl-
edgement is ready to
reintegrate
SM 1226 F-DQ Switching frequency
4 x 24 VDC exceeded; readback
SM 1226 F-DQ not in time
2 x Relay
Under-
•
temperature at
microcomputers
Under-
•
temperature at
I/O
Fail-Safe signal module (SM) diagnostics
Possible causes Corrective measures
Short-circuit
•
Sensor mechan-
•
ical activation or
alignment out of
tolerance
Sensor supply
•
shorted to P
•
Short-circuit test Increase short-circuit test
duration configured duration.
too short
Failed sensor supply Replace the fail-safe SM.
Short-circuit
•
•
Excessive load on Reduce load on sensor
sensor supply supply.
Failed sensor supply Replace the fail-safe SM.
Manual acknowl- Manually acknowledge
edgement required correction of channel fault
so that reintegration can
occur.
Process value from
•
safety program
changing too rapidly
for SM to follow
Shutdown due to
•
violation of low
temperature limit
•
value in the SM
case
6.2 Fault diagnostics
1
sors are mounted and
aligned to be activated
together.
Eliminate the short-
circuit.
Once the fault is
eliminated, the power
must
be switched off and on.
Eliminate the short-
circuit.
Once the fault has been
eliminated, the power
must
be switched off and on.
Change Safety program
logic to guarantee more
time between output
changes.
Check the ambient
temperature.
Once the fault
has been eliminated,
the
power must be
switched off
and on.
127