Siemens SIMATIC S7 F Manual page 321

Fail-Safe Blocks
Output Cause
n = 1: Diagnostic information for module SM1
n = 2: Diagnostic information for redundant module SM2
Output Cause
Byte 1 (in the case of F_M_DI8 and F_M_DI24 only)
•
Bit 0: Discrepancy error on channel 0 of
SMn
•
...
•
Bit 7: Discrepancy error on channel 7 of
SMn
Byte 2 (in the case of F_M_DI24 only)
•
Bit 0: Discrepancy error on channel 8 of
SMn
•
...
•
Bit 7: Discrepancy error on channel 15 of
SM1
Byte 3 (in the case of F_M_DI24 only)
•
Bit 0: Discrepancy error on channel 16 of
SM1
•
...
•
Bit 7: Discrepancy error on channel 23 of
SMn
n = 1: Diagnostic information for module SM1
n = 2: Diagnostic information for redundant module SM2
Note
In byte 0 of DIAG_1/2, the most recent error information remains stored until a new
error occurs, even if the error has already gone.
Fail-Safe Systems
A5E00085588-03
Remedies
Remedies
Check sensor
8-133