Digital Inputs Detect Loop
From EMIT Controls
Revision as of 15:25, 5 August 2022 by Thomas Peterson (talk | contribs) (Created page with "==Overview== The digital inputs to the Brain are most commonly connected to switches that either close or open on fault. Of the two options, normally-closed setup (where closed to ground is clear and open is faulted) is more safe because a wire breakage will show as faulted. However, there can also be cases where a wire is somewhere shorted to ground on the skid and the input will always read grounded even when the switch opens. To help avoid this scenario, some versio...")
Overview
The digital inputs to the Brain are most commonly connected to switches that either close or open on fault. Of the two options, normally-closed setup (where closed to ground is clear and open is faulted) is more safe because a wire breakage will show as faulted.
However, there can also be cases where a wire is somewhere shorted to ground on the skid and the input will always read grounded even when the switch opens. To help avoid this scenario, some versions of the Brain hardware support a "Detect loop" where the input can operate like a normally closed loop while also adding a detection of shorts to ground.
Hardware that supports this feature
Brain s/n 1260-3419 Brain s/n 3690+
