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Analog to Digital Pulse - RTD Transmitter

Supplier: Veederline

The TC-003 Digital RTD Temperature Transmitter is a unique device designed to transmit the temperature measured by a PT100 RTD sensor to a PLC digital input. Although it requires only one normal digital 24VDC input on the PLC, it provides an accurate temperature measurement for use in the PLC program.

Price Guide: AUD $170

It is packaged in a standard ANSI - 2”, 50mm “hockey-puck” to be installed in the head of normal industrial temperature probe assembly. The TC-003 transmitter is connected to the normal 3 wire PT100 RTD.

How does Analog to Digital Pulse - RTD Transmitter work?
It measures the resistance of the PT100 RTD  and then calculates the corresponding temperature. It then outputs the measurement as a low speed serial pulse train to a standard PLC digital input.

The PLC receives 16 bits of data in a format ready to load into a 16 bit data register. The PLC register ends up containing the value of the measured temperature in degrees C x 10. For example if the measured temperature is -5°C the transmitted data will be -50, and if the measured temperature is +10°C the transmitted data will be 100.

Is Analog to Digital Pulse - RTD Transmitter compatible?
The PLC digital input does not need to be a high speed or counter type input. Any normal 24VDC digital input is suitable.

The rate of data transmission is selected to allow non-time critical operation of the receiving PLC. The shortest pulse time is 100mS, so the PLC needs to have a maximum scan time of 50mS. This is normally very easy to achieve.

A small section of ladder program collects and interprets the pulses in sequence and loads a register with the measured temperature value.

There is no particular limit to the number of TC-003 transmitters that can be used with a single PLC. It depends only on the number of inputs and program and data memory available.