Plc Non-Fatal Error Sm Flags - Siemens SIMATIC S7 System Manual

C.3

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 799), 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
SM0.2
SM0.7
SM1.3
SM3.0
SM4.0
SM4.1
SM4.2
SM4.3
SM5.0
S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF
Non-fatal error description
Retentive Data Lost
RTC_Lost
Divide by Zero Error
Parity Error
Comm. Interrupt Queue Overflow
Input Interrupt Queue Overflow
Timed Interrupt Queue Overflow
Run-Time Programming Problem
I/O Error (any I/O error bit set)
C.3 PLC non-fatal error SM flags
SM byte Non-fatal error description
SMB9 Module 0 I/O Error Byte
SMB11 Module 1 I/O Error Byte
SMB13 Module 2 I/O Error Byte
SMB15 Module 3 I/O Error Byte
SMB17 Module 4 I/O Error Byte
SMB19 Module 5 I/O Error Byte
SMB29 Signal Board I/O Error Byte
Error codes
795