Three different current inputs on AIO-610 - one with external PS, two without

[PiMaster]

On our AIO 610 module, we'd like to use a few different current inputs from pyrometers.  One of the pyrometers requires an external power supply, while the other one does not (there are two different outputs from this one).  When we wire them up, we get an out-of-range error on one of the inputs (one without external PS).  The manual says they are not electrically isolated.

I'm assuming we're out of luck on this one.  Is that correct?

[Hal_L]

Hi,

The AIO 610 can only accept current inputs in a +/- 20 mA range. So if your pyrometer is supplying more than 20 mA, then you will receive that out of range error. I would double check what range of current this pyrometer is outputting and then you will be able to see if it's within the specification for the FieldPoint module. If the current is over 20mA, then you have the option of putting in external circuitry, such as a current divider to make the current within specifications. It would probably be a good idea to check with the manufacturer of the pyrometer as well.

Regards,
Hal L.

[PiMaster]

They're definitely both in that range (actually, 0 to 24 mA, which is an option in MAX).

The problem is that one requires a power supply from the FieldPoint module, and the other gets it from an external source.  I guess we'll have to wire the other one with an external source as well.