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Siemens Simatic S7-400 User Manual

Page 277

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Analog Modules

5-61

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

+24 V

L

+

Q

V

S+

S–

M

ANA

0 V

M

U

ISO

Chassis ground

R

L

Figure 5-21

Connecting Loads to a Voltage Output of an Isolated AO over a
Four-Conductor Connection

Two-Conductor Connection of Loads to a Voltage Output

In the case of a two-conductor connection, connect Q

V

to S+ and M

ANA

to S– on

the front connector. However, this will not produce the accuracy of a four-conductor
connection.

Connect the load to terminals Q

V

and to the reference point of the measuring

circuit M

ANA

of the module.

+24 V

L

+

QV

S+

S–

M

ANA

0 V

M

U

ISO

Chassis ground

R

L

Figure 5-22

Two-Conductor Connection of Loads to a Voltage Output of an Isolated AO

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