Special SM 335 Operating Modes
5-16
SM 335 – High-Speed Analog Input/Output Module for the SIMATIC S7-300
6ES7 335-7HG00-8BA1
Dynamic Measuring Cycle Control (DS1, byte 11)
Byte 11 “Dynamic Measuring Cycle Control” serves three purposes:
• Activation of “Measuring Only” mode
• Activation of “Comparator” mode
• Disabling/enabling analog inputs
76543210
Analog input CH0
Analog input CH1
Analog input CH2
Analog input CH3
= 1: Analog input disabled
= 0: Analog input read in
“Measuring
Only” mode
= 0: Switch mode off
= 1: Switch mode on
“Comparator” mode
Fig. 5-9 Meaning of the bits in the “dynamic measuring cycle control” byte
(Measuring Only)
Activating the mode
In order to activate “Measuring Only” mode, set bit 7 and 6 to ’1’.
Bits 5 and 4 must be set to ’0’.
Dynamic disabling of analog inputs
Bits 0 to 3 are used to disable the associated analog input. The default for bits 0 to
3 is ’0’. Setting a bit to ’1’ disables the associated input. If you disable three analog
inputs, it is possible to attain a measuring cycle time < 0.5 ms.
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