Analog modules
6.9 Analog input module SM 331; AI 8 x RTD; (6ES7331-7PF01-0AB0)
S7-300 Automation System Module data
6-82 Manual, 08/2006, A5E00105505-04
6.9.3 Additional information to SM 331; AI 8 x 16 RTD
Modes of operation
Operating modes of the SM 331; AI 8 x RTD:
● 8-channel mode (hardware filter)
● 8-channel mode (software filter)
● 4-channel mode (hardware filter)
The operating mode influences the module cycle time.
8-channel mode (hardware filter)
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 6-23 8-channel mode cycle time (hardware filter)
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