Restriction; Comparator Time (Ds1, Byte 10); Data Set 1 Of Sm 335 For The Special Mode "Comparator" - Siemens SIMATIC S7-300 Manual

5.2.2 SM 335 parameters for the special mode "Comparator"

Restriction

The parameters for the special operating mode "Comparator" can only be transferred by
means of SFC 55 WR_PARA.
Data set 1
The parameters which you can toggle dynamically are stored in data set 1 of SM 335.
Table 5- 1
Byte
0
1
2
3
4
5
6
7
8
9
10
11
12
13

Comparator time (DS1, byte 10)

SM 335 cannot generate a process interrupt for the end of the cycle while comparator 2
mode is enabled. It can therefore happen that SM 335 does not generate an end of cycle
interrupt for a longer time. You can define the maximum comparator activation time by
setting the comparator time. After the active comparator time has expired, SM 335
automatically returns to the "conditional cycle" or "free cycle" mode. Define the comparator
time in milliseconds (1 = 1 ms, 2 = 2 ms, up to 0 = 256 ms).
The set comparator time is reported in the local data of OB 40, provided SM 335 has
generated a corresponding process interrupt. (refer to table 'Interrupt table triggered by the
comparator' in chapter Hardware interrupt (Page 60).
SM 335 - High-speed analog mixed module for SIMATIC S7-300
Manual, 02/2009, A5E02409063-01

Data set 1 of SM 335 for the special mode "Comparator"

Content
Analog value 1 high byte to be output
Analog value 1 low byte to be output
Analog value 2 high byte to be output
Analog value 2 low byte to be output
Analog value 3 high byte to be output
Analog value 3 low byte to be output
Reference value "Comparator 1" high byte
Reference value "Comparator 1" low byte
Reference value "Comparator 2" high byte
Reference value "Comparator 2" low byte
Comparator time
Dynamic measuring cycle control
Comparator - check byte
Reserved
Special operating modes of SM 335
5.2 Special operating mode "Comparator"
85