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Old October 11th, 2018, 01:24 PM   #1

wabc1234 is offline
Join Date: Oct 2018
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Thermocouple on 1762-if4?

Greetings to everyone,

my question is: How can I Read a thermpcouple typej ona an analog module (1762-if) on an allen bradley micrologix 1400 (rs logix 500) and convert the signal to temperature?

thanks in ahead
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Old October 11th, 2018, 01:37 PM   #2
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You will need a temperature transmitter to convert the thermocouple to a voltage or current (prefer current) see link

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Old October 11th, 2018, 01:40 PM   #3

lfe is offline
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- A thermocouple doesn't measure an absolute temperature, it measure the difference between a hot junction and a cold junction and that module has no compensation for the temperature of the cold junction, and that introduces a big error.

- The voltage generated by a J thermocouple is at most 30-40 mV and with a input module with a range of -10V to + 10V the resolution you have will be horrible bad.

In other words, to connect thermocouples directly to a PLC, you need a thermocouple input module.

Another alternative is to use an intermediate converter/transmitter with J thermocouple input and 0-10V or current output
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