Siemens S7-400 Benutzerhandbuch

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

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