Fail-Safe signal module (SM) diagnostics
6.2 Fault diagnostics
S7-1200 Functional Safety Manual
128 Manual, 02/2015, A5E03470344-AA
0x0313 Failure in the input
circuit
SM 1226 F-DI
16 x 24 VDC
Internal fault at the
read circuit/test cir-
cuit
The input SM de-
tects a failure during
bit pattern testing of
inputs. EMI or SM
hardware fault.
• If intermittant, probably
due
to interfer-
ence. Eliminate inter-
ference.
• If persistent,
or repeats after efforts
to
eliminate interference,
replace the fail-safe
SM.
0x0316 Relay cannot be
turned on
SM 1226 F-DQ
2 x Relay
Relay activated, but
remains deactivated
Relay is faulty. SM
supply voltage too
low.
• Check for supply volt-
age warning messages
and supply voltage.
• Replace the fail-safe
SM.
0x0317 Relay cannot be
turned off
(contacts welded)
SM 1226 F-DQ
2 x Relay
Relay deactivated,
but remains activated
(Relay contact is
welded)
Relay is faulty, due
to normal wear,
excessive load, or
unsuppressed in-
ductive load.
• Replace the fail-safe
SM.
• Check that load current,
including inrush, is with-
in specifications.
• Check for adequate
inductive load suppres-
sion and capacitive
load inrush limiting.
• Check for circuit faults
creating excessive
load.
0x031C Input shorted to P SM 1226 F-DI
16 x 24 VDC
Input shorted to P
failure
External wiring or
sensor shorts input
signal to L+.
Check/correct external
short-circuit.
Input configured for
short-circuit detec-
tion but wired to
Make wiring and configura-
tion agree.
Replace the fail-safe SM.
0x031D Output defective SM 1226 F-DQ
Relay coil driver
Relay or relay driver
Replace the fail-safe SM.
0x031E
Read back failure SM 1226 F-DQ
4 x 24 VDC
The SM has detected
a channel problem
where the expected
terminal voltage(s)
are not reached.
"Maximum readback
time" or "Maximum
readback time
switch on test" con-
figured value is too
Increase readback time.
Output switch fail-
Replace the fail-safe SM if
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