Johnson Controls METASYS NU-XBN101-0 Manuale utente

Metasys Network Technical Manual 636

Point Multiplex Modules Section

Technical Bulletin

Issue Date 0693

Order No. 636-027

Introduction Page 3

●

Description 3

●

Capabilities 5

●

Specification 6

Engineering 7

●

Theory of Operation 7

●

Design Considerations 9

●

XBN Switches 11

●

Wiring Details 12

●

Software Setup 27

Commissioning Procedures 29

●

Overview 29

●

Switch Settings 29

●

Power Up 32

Troubleshooting Procedures 33

●

Self-Diagnostics 33

●

Field Checks 33

●

Ordering Information 35

Multiplex Binary

2 Point Multiplex Modules—Multiplex Binary

Point Multiplex Modules—Multiplex Binary 3

Introduction

The Multiplex Binary (XBN) is a module that interfaces points to the

system and resides in the Network Control Unit (NCU) or Network

Expansion Unit (NEU). It monitors up to 32 binary inputs (voltage, dry

contact, or pulse), then reports changes in their states to the NCU for

processing. LEDs on the module face display the status for each

corresponding input.

Figure 1: Multiplex Binary

Description

PHOTO

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 NCU



over the

N2 Bus



without 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.

N1 LAN

Operator

Workstation

NEU

w/XBN Inside

N1 LAN

Equipment Room

NCU

w/XBN Inside

with2xbn

Building

Entrance

Figure 2: Typical Application with Two XBNs

Purpose

Application

Point Multiplex Modules—Multiplex Binary 5

Table 1: Capabilities

Capabilities

Capability Description Purpose

Modular Packaging XBN electronics are integrated with system circuitry

(eliminating the need for separate boxes for wires,

transducers, etc.) and are housed in durable cases.

Modules plug in and lock into position.

Simple to install and service; casing prevents

physical and ESD damage in addition to shielding

electronics from induced noise.

32 Binary Inputs DC, AC, Dry Contact, and Pulse Interfaces a high concentration of binary devices;

flexibility to retrofit existing devices.

LED Indicators 32 Binary Inputs (software-configured: light ON =

either closed contact/voltage absent), N2 Transmit,

N2 Receive, Power, and Error (sanity circuit reset,

check sum, RAM test result)

Determine module status by visual inspection.

Enhanced Input Circuitry Each input is balanced differentially, with a high

input impedance (significantly reducing amperage)

and high level of isolation from noise and

transients. Inputs withstand 120 VAC RMS of

normal mode voltage.

The XBN withstands high levels of noise, especially

common mode noise. Enables mixed input and

output lines through a conduit, when allowed by

local electrical codes.

Point Status Change

Reports The XBN latches and holds any valid data changed

from an input point; further data changes are

ignored until the first-detected change has been

reported to, and acknowledged from, the NCM.

Report COS for alarm analysis or program

triggering, and to notify operator(s).

Disable COS Reporting Suppresses COS, reporting capabilities on a per

input basis. While COS reporting is disabled, the

NCM can still request point status without re-

enabling the COS report functions.

Prevent constant COS reports from specified points

(e.g. fluttering airflow switch).

Debounce Filter Programs the XBN to ignore transient or intermittent

changes by requiring consecutive identical input

data before determining the current state.

Helps prevent false alarms or erroneous counts in

accumulator points.

Accumulator (Pulse

Applications) For each status input, detects and totals transitions

for pulses of less than or equal to 10 Hz (each

pulse yields two transitions). When requested by

the NCM, the Accumulator releases the number of

valid signal transitions (up to 65,535 before rolling

over).

Permit monitoring of devices that transmit

frequency signals.

6 Point Multiplex Modules—Multiplex Binary

Table 2: Specifications

Product Description

Code Name Multiplex Binary (NU-XBN101-0)

Microprocessor Intel 80C51

Memory 8K by 8-bit Static RAM

8K by 8-bit E2PROM

Binary Inputs 32 (contact, voltage present/absent, and low frequency pulses)

Maximum Input Voltage 120 VDC or 120 VAC RMS 50/60 Hz

Maximum Pulse Input

Frequency 10 Hz or less (at 10 Hz, 12 mS < positive pulse

width < 52 mS; and Debounce Filter set to 2)

Input Types DC-Low Thresh: 3 V, Hi Thresh: 8 V

AC - Low Thresh: 2V, Hi Thresh: 18 V

Dry Contact - Low Thresh: 100 K ohms, Hi Thresh: 800K ohms

Pulse—(0-10 Hz)

Minimum Output Load 10 mA at 5 VDC

Source Power Power is from PWR in the NCU/NEU

Operating Temperature 32°to 122°F (0°to 50°C)

Storage Temperature -40°to 158°F (-40°to 70°C)

Operating Humidity 10% to 90% RH

Storage Humidity 5% to 95% RH

Dimensions and Weight 14 in. H x 1.5 in. W x 6 in. D (355 x 36 x 152mm); 2 lbs 11 oz (1.13 kg)

Agency Compliance FCC Part 15, Subpart J, Class A

UL916

CSA C22.2 No. 205

Agency Listing UL Listed and CSA Certified as part of the MetasysNetwork

Specifications

Point Multiplex Modules—Multiplex Binary 7

Engineering

The figure below illustrates the XBN’s general components and their

functions.

Field input ①is routed either through an IUN function module or directly

into the base frame, depending on the XBN’s slot position.

V/C

IUN FM

Input

Circuit

Address

Debounce

Filter Software

EOL

Microprocessor

Circuit

LEDs

N2 LEDs

Signal

XBN

Figure 3: XBN Block Diagram

Thirty-two identical binary input circuits ②monitor input signals (dry

contact, DC voltage, AC voltage, or frequencies of 10 Hz or less)

changing from logical status 0 (voltage absent, contact open) to 1 (voltage

present, contact closed) under these conditions:

Table 3: Input Signals

Sensed Input Logical 0 Logical 1

Contact > 800K ohms < 100K ohms

VDC <3 VDC > 8 VDC to limit of 120

VAC <2 VAC > 18 VAC to limit of 120

Frequency <10 Hz

12 mS < Pos. Pulse < 52 mS at 10 Hz

Debounce count set to 2

Point defined as accumulator

The user sets a switch for each input ③to select which type of signal the

input senses: voltage or contact.

●If the V/C switch is incorrectly set to voltage, no contact changes-of-

state can be sensed by the circuit.

●If the V/C switch is incorrectly set to contact, voltage differentials

greater than -12 (e.g., -10) produce a logical 1; voltages less than -12

Theory of

Operation

8 Point Multiplex Modules—Multiplex Binary

(e.g., -14) produce a logical 0. For large AC voltages, this may not

have consequences, but low voltage levels will result in errors.

Address switches ④provide a means to identify the module along the N2

Bus. An End-of-Line (EOL) switch ⑤must also be positioned correctly

for the N2.

Each input is protected to withstand all types of short circuits (input to

input, across an input, input to other potentials) without damage, although

operation would be temporarily unreliable. Input circuitry also protects

against transient overvoltages of up to 1000 volts peak, with current

tolerance to ESD static spikes protected to 6000 volts.

Input changes are filtered in software by a debounce filter ⑥downloaded

into memory.

LEDs ⑦indicate the state of the respective input as received by the

microprocessor after debounce filtering. The state of the input

representing LED On is software programmable (either contact

closed/voltage present or contact open/voltage absent).

The microprocessor outputs signals to the N2 communications circuitry ⑧

on the NCU/NEU backplane. Additional LEDs indicate N2 transmit and

receive signals, as well as power and sanity circuit/firmware errors.

Point Multiplex Modules—Multiplex Binary 9

The XBN monitors up to 32 binary inputs. As a module that fits into

specific slots on the NCU/NEU base frame, its environmental

requirements are identical to those of the NCU/NEU and may be

referenced in that technical bulletin. Power is supplied by an associated,

and separately ordered, Power Supply Module.

The figure below illustrates in which slots the module may be installed

(into any base frame’s slot except the number 3 slot of a 5-slot base

frame).

5-slot 2-slot

1-slot5-slot

2-slot

xbn2

Figure 4: Mounting Options for the XBN

When installing an XBN into a slot normally occupied by a DCM

(Slots 1 and 5 of a 5-slot, Slot 1 of a 2-slot), an IUN Function Module is

necessary to transmit signals from the first 16 terminal blocks of the

NCU/NEU to the XBN. Each IUN transmits two independent signals,

requiring a total of eight IUNs. Inputs 17-32 (see Figure 19 for input

locations) terminate on the bottom 16 terminal blocks and do not require

Design

Considerations

Mounting

Darkened slots indicate

Point Multiplex Module

location options.

When placed in slots

normally occupied by

DCMs, Point Multiplex

Modules require IUN

FMs (also darkened).

10 Point Multiplex Modules—Multiplex Binary

IUNs to transmit signals to the XBN. The presence of the IUN FM does

not change or expand the range of signals processed by the XBN.

All configurations of the XBN in relation to other modules in the

NCU/NEU panel are compatible, provided that the modules are properly

located and the points correctly defined in the software.

Wiring both states of a Form C input requires two binary input terminals,

as illustrated in Figure 5.

Note: Form C inputs must connect to adjacent screw terminal blocks,

starting at an odd-numbered block (i.e., 1 and 2, 27 and 28;

not 2 and 3, etc.).

Using all Form C inputs would reduce the point monitoring

capacity from 32 to 16.

xbn3

Binary

Device

GND

(5)

(6)

Base

Frame

Figure 5: One Form C Input Terminating in Two Binary Inputs

To suppress nuisance signals from a noisy binary input, change the

Debounce Filter to a value higher than the default of 2 (24 milliseconds);

e.g., to 3, which yields 36 milliseconds.

An exception to this is when the input is a 0 to 10 Hz pulse input. In this

case, the Debounce filter must be 24 milliseconds or less, and shields or

other methods must be used to reduce the susceptibility of the lines to

induced noise. See Debounce Filter under the Binary Input Object

Technical Bulletin.

Form C Inputs

Binary Inputs In

Noisy Environments

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