Analog Modules
4-92
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
4.19.2 8-channel mode
Description of the module cycle
In 8-channel mode, the isolated analog input module SM 331; AI 8 x 16 bits
switches between the two channels in each group. As the module contains four
analog/digital converters (ADC), all four of the ADCs simultaneously convert 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 4-35).
Scan time
Start analog conversion
(simultaneous)
K0 K2 K4 K6
K1 K3 K5 K7
Start analog conversion
(simultaneous)
Figure 4-35 8-channel mode cycle
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