7550RTU Pulse input, minimum voltage for correct operation ?

[Rich_Lannaghan]

Hi,

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 ?

[Tom_Stevenson]

Christopher Ailey

[DanL]

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

[sesa54412_bridg]

Hi Richard,

Dan Loewen has provided a good description which should answer your question.

Nonetheless, here is a picture in case it is still not clear:

Kind Regards,

Chris.