Is it possible to connect Pt100 to PR200?
There are two ways to connect a Pt100 sensor to the PR200 Programmable Relay:
- Use the Pt100 macro (see the attachment to this post)
- Use an analog input of the PRM-X.3 extension module.
Although the first method is completely free to implement, it does not provide enough accuracy. The accuracy of ±5% (52,5 °C) may be too poor for some applications.
If the accuracy is of the utmost importance to your project, the second method is the best solution for you. Having purchased a PRM-X.3, or if you already have one, you can configure any of its inputs for Pt100. In this case, accuracy is ±0.25% (2.6 °C). Since the extension modules of the PRM series are connected to the PR200 over an internal bus, the PR200 treats them as its own, meaning the I/Os of a PRM module are of the same performance as the I/Os of the base unit (PR200).