Siemens SIMATIC S7 Functional Safety Manual

Fail-Safe signal module (SM) diagnostics
6.2 Fault diagnostics
S7-1200 Functional Safety Manual
Manual, 02/2015, A5E03470344-AA
125
6.2.2
Fault types, causes, and corrective measures
The "Fault types, causes, and corrective measures" table below lists the messages of the
S7-1200 fail-safe SMs. These messages are displayed in the TIA Portal under "Online &
diagnostics" > "Diagnostics" > "Diagnostic buffer". When you highlight an individual text line
in the diagnostic buffer, the Event ID for that text item is displayed, along with module
identity and location that generated the message. You may need to expand the window to
see all information.
Table 6- 6 Fault types, causes, and corrective measures
Event ID
Diagnostic mes-
sage
Fail-safe signal
module
Description
Possible causes
Corrective measures
1
0x0001 Short-circuit SM 1226 F-DQ
4 x 24 VDC
A channel problem
has been detected
where either the P
terminal or M termi-
nal is at an unex-
pected potential.
Short-circuit of the
output
Eliminate the short-circuit.
Short-circuit be-
tween channels with
different signals
Eliminate the short-circuit.
Output overload
Eliminate the overload.
"Maximum readback
time switch on test"
value is configured
too small
Increase "Maximum read-
back time switch on test" if
permissible.
Short-circuit of out-
put to M
Eliminate the short-circuit.
Defective output
driver
Replace the fail-safe signal
module (SM).
0x0005 Overtemperature All
• Overtemperature
at microcomputer
• Overtemperature
at I/O
Shutdown due to
violation of high
temperature limit
value in the module
case
Check the ambient tem-
perature. Once the fault
has been eliminated, the
power must be switched off
and on.
0x004D PROFIsafe
communication
error (CRC)
All Transmission error in
data message frame:
Data inconsistent
(CRC (cyclic redun-
dancy check) error)
Communication
interference be-
tween the fail-safe
CPU and the fail-
safe signal module
(SM) (for example,
due to electromag-
netic interference in
excess of limits or
sign-of-life monitor-
ing error)
• Check the communica-
tions connection.
• Eliminate the interfer-
ence.

Siemens SIMATIC S7 Specifications

General

Brand	Siemens
Model	SIMATIC S7
Category	Controller
Language	English