Analog Modules
4-147
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
“Software filter 8 channels” mode
In 8-channel software filter mode, the analog input module SM331; AI 8 x TC
switches over between the two channels in each group. As the module contains
four analog/digital converters (ADC), all four of the ADCs convert simultaneously
for channels 0, 2, 4 and 6. Once the even-numbered channels have been
converted all the ADCs simultaneously convert for the odd-numbered channels 1,
3, 5 and 7 (see Figure 4-47).
Scan time
Start analog conversion
(simultaneous)
K0 K2 K4 K6
K1 K3 K5 K7
Start analog conversion
(simultaneous)
Figure 4-47 Software filter 8 channels scan time
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