Siemens S7-400 ユーザーズマニュアル

5-90

S7-400, M7-400 Programmable Controllers Module Specifications

A5E00069467-07

 

The analog input module SM 431; AI 8 

 

14 Bit has the following features:

•

Rapid A/D changeover, therefore particularly suitable for highly dynamic
processes

•

8 inputs for voltage/current measurement

•

4 inputs for resistance measurement

•

Unlimited measuring range selection

•

14-bit resolution

•

Supply voltage: 24 VDC required only for the connection of 2-wire transmitters

•

Analog section isolated from CPU

•

The maximum permissible common mode voltage between the channels and
between the reference potential of the connected sensors and M

ANA

 is 8 VAC

 

CH0

CH1

CH6

CH7

+5V

0V

0V

 – 15V

 + 5V

 + 15V

L+
M

ENABLE

MUL

TIPLEXER

Bus S7-400

Bus control

A

D

Bus S7-400

Bus S7-400

Measuring

     3

range
module

Measuring

     0

range
module

MANA

M

ANA

Figure 5-30

Block Diagram of the SM 431; AI 8 x 14 Bit