Needs to know the current rating for the Digital Inputs on the ION7300 Series
Digital IO of the ION7300 Series
The maximum current a single Digital Input channel will draw is 0.9 mA. This assumes a 0 ohm load from Common to S1. If the resistance between the terminals is more, the current draw will be less. If all 4 contacts are closed, each channel will at most have 0.9 mA, with the Common having at most 3.6 mA.