Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
51
Fault reaction and diagnostics
6
6.1 Fault reactions of the F-SMs
6.1.1 Reactions to Faults in Standard Mode
Fault reactions
Fail-safe signal modules react to faults similar to standard modules in S7-300 or ET 200M
when operated in standard mode. You can react to a fault or interrupt event either by setting
a CPU STOP, or by calling an an error OB or interrupt OB in the user program (see
S7-300
Automation System: CPU 31xC and CPU 31x: installation
Operating Instructions).
Fail-safe values
Fail-safe values can be assigned and are output by the fail-safe modules to the process, for
example, when:
● the CPU goes into STOP, or when a CP operated as DP master goes into STOP
● an IM 153-2/-2 FO (ET 200M) goes into STOP
● PROFIBUS DP is interrupted
● Interruption of PROFINET IO
Output of fail-safe values at the output modules
Fail-safe digital output modules operated in standard mode support the fail-safe values "0",
"1", or "hold last value". You assign the required fail-safe value in in the object properties
dialog for the F-SM in
HW Config
(refer to the chapter
Digital modules
).
See also
Diagnostic messages of SM 326; DO 8 x DC 24V/2A PM (Page 133)
Diagnostic Messages for SM 326; DI 8 x NAMUR (Page 121)
Diagnostic message
s of SM 326; DI 24 x DC 24V (Page 99)
Diagnostics messages of SM 326; DO
10 x DC 24V/2A (Page 152)
Diagnostic M
essages for SM 336; AI 6 x 13 Bit (Page 215)
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