Siemens Simatic M7-400 Manual de usuario descargar pdf (Pagina 268)

100

101

Analog Modules

5-52

S7-400, M7-400 Programmable Controllers Module Specifications

A5E00069467-07

Three-Conductor Connection of a Resistance Thermometer

During three-conductor connection to modules with 4 terminals per resistance

thermometer, you must set up a jumper between M–

and I

– and SE– and

AGND

(see Figure 5-15).

The module compensates in this circuit for the effect of the line resistance between

the module and the resistance thermometer/resistor.

Make sure that the connected cables I

+ and M+ and the cables SO and SE+ are

directly connected to the resistance thermometer.

To get an accurate measurement, make sure that the connected cables M+, I

and I

– and the cables SE+, SO and AGND are the same length and have the

same cross-section.

–

C+

C–

SE+

SE–

AGND

Figure 5-15 Three-Wire Connection of Resistance Thermometers to an AI

Two-Conductor Connection of a Resistance Thermometer

With a two-conductor connection, you must insert jumpers on the module between

and I

C+

and between M

–

and I

C–

Note: Cable resistance is also measured.

–

C+

C–

Figure 5-16 Two-Wire Connection of Resistance Thermometers to an AI

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Siemens Simatic M7-400 Manual de usuario Pagina 268

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