Siemens SIMATIC User Manual

Analog modules
6.4 Analog input module SM 331; AI 8 x 16 Bit; (6ES7331-7NF10-0AB0)
S7-300 Module data
Manual, 06/2017, A5E00105505-AJ
325
6.4.3 Additional information for SM 331; AI 8 x 16 Bit
Modes of operation
Operating modes of SM 331; AI 8 x 16 Bit:
● 8-channel mode
● 4-channel mode
8-channel operating mode
In this mode, the module changes between the two channels of each group. Since the
module contains four analog/digital converters (ADC), all four ADCs convert simultaneously
for channels 0, 2, 4 and 6. After converting the channels with the even numbers, all ADCs
simultaneously convert for the channels with the odd numbers 1, 3, 5 and 7 (see the figure
below).
Figure 6-5 8-channel mode cycle time

Siemens SIMATIC Specifications

General

Brand	Siemens
Model	SIMATIC
Category	Control Unit
Language	English