8-Channel Mode - Siemens SIMATIC S7-300 Reference Manual

Analog Modules
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).
Figure 4-35
4-92
Start analog conversion
(simultaneous)
K0 K2
Start analog conversion
(simultaneous)
K1 K3
8-channel mode cycle
K4 K6
K5 K7
Programmable Logic Controllers S7-300 Module Data
Scan time
A5E00105505-03