Siemens SIMATIC S7 - SMW98: Expansion I;O Bus Communication Errors

Special memory (SM) and system symbol names
D.17 SMW98: Expansion I/O bus communication errors
S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF
821
D.17
SMW98: Expansion I/O bus communication errors
SMW98 gives you information about errors on the expansion I/O bus.
Table D- 18 SMW98 Expansion I/O bus communication error counter
S7-200 SMART
symbol name
SM address
(Read/Write)
Description
EM_Parity_Err SMW98 The CPU increments this word each time the CPU detects a
parity error on the expansion I/O bus. Power cycling the CPU
clears the word or writing a zero to the word.