Principles of analog value processing
4.7 Wiring and connecting loads/actuators to analog outputs
S7-300 Module data
258 Manual, 06/2017, A5E00105505-AJ
4.7.1 Wiring and connecting loads/actuators to voltage outputs
Wiring and connecting loads to a voltage output
The voltage outptus support the wiring and connecting of 2-wire and 4-wire loads. Certain
analog output modules, however, do not support both types of wiring and connecting.
Wiring 4-wire loads to the voltage output of an electrically isolated module
The 4-wire load circuit returns high precision. Wiring and connecting the S- and S+ sense
lines directly to the load. This allows direct measurement and correction of the load voltage.
Interference or voltage dips may lead to potential differences between the sense line S- and
the reference loop of analog circuit M
ANA
. This potential difference may not exceed set limits.
Any potential difference above limits has a negative impact on analog signal precision.
Figure 4-17 4-wire connection of loads to the voltage output of an electrically isolated analog output
module
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