Siemens Simatic S7 Series

Special memory (SM) and system symbol names
D.17 SMW98: I/O expansion bus communication errors
S7-200 SMART
System Manual, 09/2015, A5E03822230-AC
683
D.17
SMW98: I/O expansion bus communication errors
SMW98 gives you information about errors on the expansion I/O bus.
Table D- 16 SMW98 I/O expansion bus communication error counter
S7-200 SMART
symbol name
SM address
(Read/Write)
Description
EM_Parity_Err SMW98 This word is incremented each time a parity error is detected on
the expansion I/O bus. It is cleared upon power up and by the
user writing a zero.