Does anybody know what the minimum voltage that the 7550RTU can take on a digital input from a pulse meter ?
The manual states external supply of maximum 130VDC but what is the minimum for the input to operate correctly ?
The ION7550 digital inputs are internally excited to -30Vdc with a high-impedance source making them most suitable for simple closed-contact sensing (zero volts).
Any (low-impedance) voltage source connected between 0V and 130V will be recognized as closed.
Hope this helps
Dan Loewen has provided a good description which should answer your question.
Nonetheless, here is a picture in case it is still not clear:
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