Sm 335 Parameters For The Special Mode "Comparator"; Wire-Break Check; Meaning Of The Bits In The "Wire-Break Check" Byte; Switchover - Siemens SIMATIC S7-300 Manual

Wire-break check

You can enable the wire-break check for specific analog inputs at the wire-break check
parameter (byte 12 in data set 1).
Figure 3-5
3.3.3

SM 335 parameters for the special mode "Comparator"

Introduction
If special mode "Comparator" is set, SM 335 compares a default analog value with the
analog value measured at one of the analog inputs. In this mode SM 335 behaves similar to
a comparator. For more information about the "Comparator" mode, refer to chapter Special
operating mode "Comparator" (Page 79).

Switchover

For information about the switchover to the special operating mode "Comparator", refer to
chapter Special operating modes of SM 335 (Page 77).
Restriction
The parameters for the special operating mode "Comparator" can only be transferred by way
of SFC 55 "WR_PARM" or SFB 53 "WRREC".
NOTICE
The transfer always has to include the entire data set DS1 (bytes 0 to 13).
SM 335 - High-speed analog mixed module for SIMATIC S7-300
Manual, 02/2009, A5E02409063-01

Meaning of the bits in the "wire-break check" byte

Data exchange with SM 335
3.3 Modifying SM 335 parameters in RUN
53