Analog modules
9.2 SM 336; AI 6 x 13 Bit
Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
217
Diagnostic message Possible causes of the problem Corrective measures
Error in communication between
the CPU and the module, for
example, due to defective
PROFIBUS connection or
electromagnetic interference in
excess of limits.
Check the PROFIBUS
connection
Eliminate the interference
Timeout of safety message frame
monitoring
Check the monitoring time
parameters
CRC signature error, for example,
due to electromagnetic
interference in excess of limits.
Eliminate the interference
Communication error
CPU is in STOP Read the diagnostics buffer
Excessive electromagnetic
interference at times
Eliminate the interference Time monitoring activated
(watchdog)
Defective module Replace the module
Excessive electromagnetic
interference at times
Eliminate the interference and
cycle power OFF/ON
EPROM fault
RAM fault
Defective module Replace the module
Electromagnetic interference has
exceeded limits
Eliminate the interference
Defective module Replace the module
Processor failure
Switching rate exceeded Reduce switching rate
CRC signature error CRC signature error during
communication between the CPU
and the module has occurred, for
example, due to electromagnetic
interference in excess, faults
during sign-of-life monitoring error
or standard program accesses F-
SM.
Eliminate the interference
Assigned monitoring time
exceeded
Check the monitoring time
parameters
Timeout of safety message
frame monitoring
Startup of the fail-safe signal
module
—
Message frame error Sign-of-life and/or CRC signature
entered in the data message
frame
Check the sign-of-life and CRC
signature entries in the data
message frame for "0" value
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