Switchover To The Special Operating Modes; Comparator (Ds1, Byte 11); Measuring Only (Ds1, Byte 11) - Siemens SIMATIC S7-300 Manual

Special operating modes of SM 335

5.1 Switchover to the special operating modes

5.1 Switchover to the special operating modes
Dynamic measuring cycle control
To switch to one of the special operating modes, you must set the corresponding check bits
in data set 1, byte 11 and then transfer the entire data set 1 to the CPU by calling SFC 55
"WR_PARM" or SFB 53 "WRREC"; refer to chapter Modifying SM 335 parameters in RUN
(Page 47) .
Note
A special operating mode can only be activated after the previously called special operating
mode has been terminated. If this rule is ignored, the diagnostics function reports and
internal error.

Comparator (DS1, byte 11)

To enable the special mode "Comparator", you must transfer all parameters for SM 335 and
set the bits 4, 5 and 7 in byte 11:
Figure 5-1

Measuring Only (DS1, byte 11)

To enable the special mode "Measuring Only", you must transfer all parameters for SM 335
and set bit 6 and 7 in byte 11:
Figure 5-2
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Dynamic measuring cycle control for the special mode "Comparator"
Dynamic measuring cycle control for the special mode "Measuring Only"
SM 335 - High-speed analog mixed module for SIMATIC S7-300
Manual, 02/2009, A5E02409063-01