Siemens Simatic S7-300

Analog modules
6.4 Analog input module SM 331; AI 8 x 16 Bit; (6ES7331-7NF10-0AB0)
S7-300 Automation System Module data
6-24 Manual, 08/2006, A5E00105505-04
6.4.3 Additional information to SM 331; AI 8 x 16 Bit
Modes of operation
Operating modes of the SM 331; AI 8 x 16 Bit:
● 8-channel mode
● 4-channel mode
8-channel operating mode
In this mode, the module does not toggle between the two channels of each group. The four
analog-to-digital converters (ADC) of the module simultaneously convert channels 0, 2, 4
and 6. The ADCs first convert the channels with even numbers, then those with the odd
numbers 1, 3, 5 and 7 (see the figure below.)
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Figure 6-5 8-channel mode cycle time