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Siemens Simatic S7-400 User Manual

Page 313

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Analog Modules

5-97

S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07

Circuit Variants of the Channels

Two channels are set in each case with the measuring range module. There are
therefore restrictions as regards the measuring method for the adjacent channels
0/1, 2/3, 4/5 and 6/7, as shown in the following table:

Table 5-58 Selection of the Measuring Method for Channel n and Channel n+1 of the SM 431; AI 8

14

Bit (6ES7 431-1KF20-0AB0)

Meas. Type
Channel n+1

Meas. Type Chan-

nel n

Disabled

Voltage

"

1 V

Voltage
1 to 5 V

Voltage

"

10 V

Current

4-DMU

Current

2-DMU

R-4L

Disabled

x

x

x

x

x

x

Voltage

"

1 V

x

x

Voltage 1 to 5 V

x

x

x

Voltage

"

10 V

x

x

x

Current four-wire
transmitter

x

x

Current two-wire
transmitter

x

x

Resistance
four-conductor

x

Example

If you select “current (two-wire transmitter)” for channel 6, you can only disable the
measuring method or set “current (two-wire transmitter)” for channel 7.

Circuit for Resistance Measurement

The following conditions apply when measuring the resistance with the SM 431;
AI 8 x 14 Bit:

Table 5-59 Channels for Resistance Measurement of the SM 431; AI 8

14 Bit (6ES7431-1KF20-0AB0)

Measuring Type Parameter

Permissible

for Channel n

Condition

Resistor
(four-conductor terminal)

0, 2, 4 or 6

You must disable the

(

“Measuring Type” parameter for

channels n+1 (1, 3, 5, 7).

The reason The connections of channel n+1 are used
to supply the resistance that is connected to
channel n.

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