Siemens Simatic S7 Series

Error codes
C.2 PLC non-fatal error SM flags
S7-200 SMART
660 System Manual, 09/2015, A5E03822230-AC
C.2
PLC non-fatal error SM flags
Overview
Non-fatal errors are those that may degrade some aspect of PLC performance, but do not
render the PLC incapable of executing the user program and updating I/O. To help you in
debugging your program, information associated with error conditions is stored in Special
Memory (SM) locations (Page 665), which can be accessed by the user program. For
example, if you do not want to continue in RUN mode with certain non-fatal error conditions,
you can have the user program force a transition to STOP mode when the undesirable
condition occurs.
The following table lists and describes the Special Memory non-fatal error information.
SM bit
Non-fatal error description
SM byte
Non-fatal error description
SM0.2
Retentive Data Lost
SMB9
Module 0 I/O Error Byte
SM0.7 RTC_Lost SMB11 Module 1 I/O Error Byte
SM1.3
Divide by Zero Error
SMB13
Module 2 I/O Error Byte
SM3.0
Parity Error
SMB15
Module 3 I/O Error Byte
SM4.0
Comm. Interrupt Queue Overflow
SMB17
Module 4 I/O Error Byte
SM4.1
Input Interrupt Queue Overflow
SMB19
Module 5 I/O Error Byte
SM4.2
Timed Interrupt Queue Overflow
SMB29
Signal Board I/O Error Byte
SM4.3
Run-Time Programming Problem
SM5.0
I/O Error (any I/O error bit set)