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Purpose
Application
4 Point Multiplex Modules—Multiplex Binary
The XBN interfaces a high concentration of binary input points to the
NCU or NEU. The inputs may be any combination of these points: dry
contact, up to 10 Hz frequency, and up to 120 VAC or VDC.
When residing in or remote to an NCU, the XBN serves to increase the
point capacity of the NCU.
If the points are clustered at a distant location, the XBN additionally
provides an economical way to connect them to the NCUover the
N2 Buswithout having to hardwire each contact separately to the NCU.
Typically, the XBN monitors the status of 2-position devices such as fans,
pumps, or security panels. Voltage input from a starter or pilot device can
also indicate that the equipment has changed state.
In addition, the XBN can detect pulses from flow meters, electric utility
meters, or other pulse output devices whose frequency is 10 Hz or less.
The pulses are collected in the XBN's accumulator, then transmitted to the
Network Control Module where they are converted into readable analog
values.
The diagram below illustrates a configuration using two XBNs: the first
XBN oversees HVAC-related fans and pumps near a building entrance.
The data is transmitted over an N2 Bus to the NCU in the main equipment
room. The second XBN is installed directly in the NCU, monitoring a
variety of binary inputs in the equipment room itself.
Operator
Workstation
Figure 2: Typical Application with Two XBNs
N1 LAN
NCU
w/XBN Inside
Equipment Room
w/XBN Inside
N1 LAN
Building
Entrance
NEU
with2xbn
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