Special SM 335 Operating Modes
5-12
SM 335 – High-Speed Analog Input/Output Module for the SIMATIC S7-300
6ES7 335-7HG00-8BA1
Note
To ensure compatibility with older module versions, the SM 335 has two
comparator modes.
Comparator mode is set via bit 4:
Bit 4 = 0: mode 0 (Comparators 1 and 2 work on only one measuring channel; this
mode should only be set to ensure compatibility with older module versions)
Bit 4 = 1: mode 1 (Comparators 1 and 2 work on different or the same measuring
channels – see Figure 5-7, bit 3 to bit 0.
With comparator mode 0, the bit allocation (bit 3 to bit 0) shown in Figure 5-7 chan-
ges as follows:
• 0001 – Analog input CH0
• 0010 – Analog input CH1
• 0100 – Analog input CH2
• 1000 – Analog input CH3
Comparator check byte (DS1, byte 12)
The Comparator check byte provides an additional means of checking the
comparator. The Comparator check byte has the following format:
76543210
Analog output CH0
Analog output CH1
Analog output CH2
Analog output CH3
Direction
Comparator 1
Comparator 2
Hardware interrupt
Fig. 5-8 Comparator check byte for “Comparator” mode
Direction (DS1, bit 12.7)
When bit 7 in the Comparator check byte is set to ’0’, the analog values are
compared in ascending order (as in Figure 5-8).
If bit 7 is set to ’1’, they are compared in descending order.
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