Transmitters for transferring process variables to programmable logic controllers

Designing low output resistors in the transmitter, the current loss problem is solved, measurement accuracy is improved, and circuit design is simplified, making it easy to integrate into the combined transmitter.

CN114253204BActive Publication Date: 2025-03-28IFM ELECTRONIC GMBH
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Patent Information

Application Number
CN202111107987.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2020-09-23
Filing Date
2021-09-22
Publication Date
2025-03-28
Estimated Expiration
2041-09-22

AI Technical Summary

Technical Problem

When existing transmitters convert analog measurements to industry standard current or voltage signals, there are current losses problems, resulting in inaccurate measurements and complex circuits and difficult to integrate into combined transmitters.

Method used

By setting a compensation resistor in the transmitter, the current loss caused by the resistor of the load voltage is compensated, and a low output resistance is designed through the voltage divider to avoid complex measurement and control equipment.

Benefits of technology

Effective compensation of current loss is achieved, measurement accuracy is improved, and circuit design is simplified, making it easy to integrate into existing combined transmitters.

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Abstract

The invention relates to a transmitter for transmitting a process variable to a programmable logic controller, wherein in current mode a current of 4-20 mA is fed into a load (1) and in voltage mode a 0-10 V signal is generated, the transmitter comprising a process value input (2), a current stage (3), a voltage stage (4) and a U / I output (5) for a current or voltage signal, and a U / I control input (6, 6a, 6b) for switching between the two modes. According to the invention, the transmitter is configured to feed a current dependent on the voltage across the load (1) into the current stage (3) via a resistor (7), thereby compensating for the current loss at the voltage stage (4) dependent on the voltage across the load (1).
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