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3 connecting loads/actuators to analog outputs – Siemens Simatic S7-400 User Manual

Page 538

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Interface Submodules

13-42

S7-400, M7-400 Programmable Controllers Module Specifications

A5E00069467-07

13.7.3

Connecting Loads/Actuators to Analog Outputs

Abbreviations Used

The abbreviations used in Figures 13-20 to 13-21 have the following meanings:

QI:

Analog output current

QV:

Analog output voltage

S:

Reference potential of the analog circuit

R

L

:

Load resistance

Figures 13-20 and 13-21 show you how you must connect loads/actuators to the
current or voltage outputs of the analog output module.

Connecting Loads to the Current Output

The following figure shows wiring on one channel as an example.

+24 V

R

L

L

+

QI

Ground bus

V

CM

M

0 V

Figure 13-20 Connecting Loads/Actuators via a Two-Wire Connection to a Current Output

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