The MX Digital Loop Card provides MX loop communications for the Simplex 4100ESi fire alarm panel via a single electrically isolated MX Digital loop. It supports up to 250 MX devices – detectors and modules – and provides up to 500mA of loop power.
The 4100-6077AU MX Digital Loop Card (Figure 1) is a flat, 4×10-inch form-factor module that plugs into the Power Distribution Interface (PDI) of the 4100ESi panel. An earlier version of the card was supplied as 4100-6077LIM, which included an extra bracket on which two LIM800 Loop Isolators were mounted and wired. This version of hardware has been withdrawn, as the 4100-6077AU now includes loop short circuit protection.