DUI expander not reading inputs correctly on an MNL-800

Issue

We have installed some DUI-5R modules on MNL-800's . The LED indications on the DUI's follow the contact closure signals connected to them, but the
values being read based on those status points do not match. Eg. DUI-5 has led's on for inputs 1, 3, and 5 however the controller values have 1 and 5 on only.

Product Line

TAC I/A Series

Environment

WorkPlace Tech

MNL-800

Cause

MNL-800 Inputs require an external parallel resistor (Rp=22.1 kohms, 1%) be placed across the UI input to which the DUI is attached. Some DUI models may incorporate this resistor that may be either switch or jumper selected.

Resolution

MNL-800 Inputs require an external parallel resistor (Rp=22.1 kohms, 1%) be placed across the UI input to which the DUI is attached. Some DUI models may incorporate this resistor that may be either switch or jumper selected.

For example the DUI-5R available in Asia Pacific notes the following:

Switch 1 set to ON for MNL-800 and OFF for all other controllers. In some models the switch is replaced by a jumper. Bridge the jumper for MNL-800s and leave open (jumper on one pin only) for all other MNL controllers.