Siemens S7-400PLC Especificações descarregar pdf (Página 238)

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101

Analog modules

5.15 Connecting loads/actuators to voltage outputs

S7-400 Automation System Module Data

238 Reference Manual, Edition 09/2009, A5E00850736-06

5.15 Connecting loads/actuators to voltage outputs

Connecting loads to a voltage output

Connecting loads to a voltage output is possible both in a 4-conductor and a 2-conductor

connection.

Note

The cables required to connect the analog output module are not drawn in the figures shown

below.

In other words, you must continue to read and follow the instructions in the section

"Connecting loads/actuators to analog outputs", which contains general information on

connecting sensors.

4-conductor connection of loads to a voltage output

You can use the 4-wire technique to achieve a high accuracy at the load by wiring the S- and

S+ sensor lines directly to the load. This results in direct measurement and correction of the

voltage at the load.

Faults or a voltage drop can result in a potential difference between the sensor lead S- and

the reference circuit of the analog circuit M

ANA

. This potential difference (U

) must not

exceed the permissible value. A negative influence on the accuracy of the analog signal is

otherwise inevitable.

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