The B882–116 24 Vdc (16-point) output module monitors field points for both open and short circuit fault conditions. The module is designed for safety applications whereby it monitors essential field wiring.
Two test modes are available: pulse test mode, and no pulse test mode. In no pulse test mode, the module detects open circuits only when the output point is off, and short circuits only when the point is on. Leakage current in the off state is less than 3 mA. Trip current to detect a short circuit is greater than 1 A. In pulse test mode, the module pulses the output to the opposite of the command state to determine the complete status of the output load. Pulse timing is: 500 s opposite state pulse once every second.
NOTE: Average currents in output circuits are changed by no more than 0.1% by full test mode.
The following illustration is the B882–116 simplified schematic diagram
This leakage current is actually the 2.5 mA test current source. It cannot be turned off.
