Fail-Safe signal module (SM) diagnostics
6.2 Fault diagnostics
S7-1200 Functional Safety Manual
126 Manual, 02/2015, A5E03470344-AA
0x004E PROFIsafe
communication
failure (timeout)
All Monitoring time ex-
ceeded for data
message frame
(timeout)
F-monitoring time
exceeded
• Adjust F-monitoring
time.
• Check Safety program
and all other CPU activ-
ities for excessive exe-
cution or demands:
– Interrupts
– Ethernet communi-
cation
– OB scheduling con-
flicts
– Long program
paths.
0x0100 Module is
defective
All Internal error Fail-Safe SM is
defective.
Replace the fail-safe SM.
0x0103 Watchdog tripped All The watchdog timer
in the SM communi-
cations processor
Fail-Safe SM is
defective.
Replace the fail-safe SM.
0x0105
Short-circuit to L+ SM 1226 F-DQ
4 x 24 VDC
The fail-safe SM
detects a channel
problem where the P-
terminal is unexpect-
edly at
L+ potential.
Eliminate the short-circuit.
Short-circuit be-
tween channels with
Eliminate the short-circuit.
Defective output
Replace the fail-safe SM.
"Maximum readback
time" value is con-
Increase readback time.
0x0106 Short-circuit to
ground
SM 1226 F-DQ
4 x 24 VDC
The fail-safe SM
detects a channel
problem where the
M-switch output
terminal is unexpect-
edly at M potential.
Short-circuit of out-
put to M, ground, or
Eliminate the short-circuit.
Defective output
Replace the fail-safe SM.
"Maximum readback
time" value is con-
Increase readback time.
0x0300 Discrepancy fail-
ure,
channel state 0/0
SM 1226 F-DI
16 x 24 VDC
External discrepancy
failure: Channel state
0/0 with 1oo2 non-
equivalent configura-
• Process signal
faulty, sensor
may be defec-
tive.
• Configured dis-
crepancy time
too short
• Check process signal,
replace sensor if nec-
essary.
• Check the configured
discrepancy time.
• Check the wiring.
• Check that both sen-
0x0301 Discrepancy fail-
ure,
channel state 0/1
SM 1226 F-DI
16 x 24 VDC
External discrepancy
failure: Channel state
0/1 with 1oo2 equiva-
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