Andover Controls Continuum Reference Guide

UN-RELEASED

REVIEW COPY

2/20/98

Downloaded from - http://www.guardianalarms.net

 1998, Andover Controls Corporation
All Rights Reserved

No part of this publication may be reproduced, read or stored in a retrieval
system, or tran smitted, in an y for m or by any means, electronic, mech anical,
ph otocop ying, recording, or otherwise, without prior written p er miss ion of
Andover Controls Corporation.

Produ ced in the Unit ed States of America.

Infinity is a trademark of Andover Controls Corporation. All other trademarks
are th e pr operty of their respective owners.

Continuum I/O Reference, Version: REVIEW February, 1998
Andover Controls part number: 30-3001-499

The i nfor m ation i n thi s book is fu rnished for informational purpos es only, is
subject to change without notice, and should not be construed as a commitment
by Andover Controls Corporation. Andover Controls Corporation, assumes no
liability for any errors or inaccuracies that may appear in this document.

Related Document s

Continuum Power Supply Reference, 30-3001-702
Continuum CPU Reference, 30-3001-701
Continuum Display Module Reference, 30-3001-711

Andover Controls Corporation
300 Brickstone Square
Andover, MA 01810
[phone]
fax: [phone]

Andover Controls Corporation

Radio Interference

This equipment has been tested and found to comply with the limits for a Class A digital device,

pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a commercial environment. This
equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in
accordance with the instructions in this manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential area is likely to cause harmful
interference in which case the user will be required to correct the interference at his own expense.

Note

This digital apparatus does not exceed the Class A limits for radio noise emissions from digital

apparatus set out in the Radio Interference Regulations of the Canadian Department of
Communications.

Avis

Le présent appareil numé r ique n’éme t pas de brui ts radioélectri q ue s dé passant les limites

applicables aux appareils numériques de la class A prescrites dans le Règlement sur le brouillage
radioélectrique édicté par le ministère des Communications du Canada.

Continuum I/O System Reference

Andover Controls Corporation

Contents

Introduction...................................................................... 1

Mechanical Installation....................................................4

Overall Dimensions....................................................................7

Door-Mounted Modules..............................................................8

Power-CPU Connections...............................................10

Connec tion of I/O Mo du le s.......................................................11

Maximum N um be r of I/O Module s............................................12

Maximum Length of I/O Bus.....................................................12

Connecting Remote I/O Modules with RS-485.........................12

Terminat i on Guidel ine s............................................................13

Individual Module Characteristics................................17

General Wiring Concerns.........................................................17

INPUT Mo du le s

UI-8-10 / UI-8-10-10V.................................................................19

DI-6-AC / DI-6-AC-HV................................................................35

DI-8............................................................................................ 43

MI-6............................................................................................53

OUTPUT Modules

DM-20........................................................................................61

AO-4-8 / AO-4-8-O.....................................................................73

DO-4-R / DO-4-R-O ....................................................................83

DO-6-TR....................................................................................91

LO-2 / LO-2-O ............................................................................99

MIXED Modules

AC-1.........................................................................................113

Continuum I/O System Reference

Andover Controls Corporation

TCX 865

ÈNTINUUM

I/O Systems

This manual describes the installation, care and use of all Continuum I/O modules.

The

Continuum

various combinations of DIN rail-mounted moduleshigh density I/O, CPU and power
supply, and your choice of several user interface modulesin a
to meet your building’s contr ol and m onitoring needs. With the
your network grows, sim ply add or replace I /O m odules as needed.

Ethernet-based intelligent building syst em allows you to mix and match

single

controller location

Continuum

system, as

Continuum

The
convection cooling, and a 3- pos ition front cover for easy, hands - free ac c es s. B uilt-in
quick-release fasteners at the back of each I/O module are provided for DIN rail
mountingno tools required. These fasteners also s nap into a locked position for panel
mounting. Input and output connectors are located at the bottom of each I/ O module and
are removable for easy field acc es s and m aintenance. All
designed for mounting in an optional NEMA 1-style

Continuum

The
module. Like all
connectors on either s ide s o network ex pans ion is quic k and eas y . Both power
transmission and com m unic ation signals between the
NetController CPU module, and all I/O modules feed through t his connect ion. For added
convenience in certain applications, such as door control or lighting control, a single
module or groups of I/O modules c an be r em otely loc ated and connected using approved
cable and powered from a local 24 VDC power s upply . Eac h I/ O module features its own
push-button for quic k and eas y networ k commis s ioning.

This document covers the st and ard Inpu t and Output modules. For information
regarding the special Continuum enclosure door-mounted display modules
consult the Andover Control s

I/O modules feature a sleek, lightweight casing designed for natural

I/O modules communicate with the

Continuum

modules, the I/O modules s nap together directly via built- in

Continuum Display Module Reference

Continuum

Continuum
Continuum

Continuum

Continuum I/O System Reference

modules are

enclosure.

NetController CPU

power supply module,

.

1

I/O System Introduction

The Continuum I/O system is comprised of a series of modules separated by function
that connect via a common elect r ic al c om m unic ations bus. Each functional component is
enclosed in a plastic case c ontaining all of its connections t o the out s ide wor ld. Modules
are connected to a central c ontroller via a standard five conduc tor connector.

The Continuum system inc ludes at least one power supply and a single controller
module. I/O modules pr ov ide the controller with the ability to int er face with the outside
world. They connect direc tly and communicate with the CPU. The following is a t y pic al
architecture drawing of a Continuum System:

Power Supply

Controller

I/O Modules

Continuum I/O modules ar e av ailable in INPUT, OUTPUT, MIXED and DISPLAY
varieties.

2

Andover Controls

The INPUT modules available are:

UI-8-10; Univers al Input Module

•

UI-8-10-10V; Univ er s al Input Module

•

DI-6 AC; AC Digital Input Module

•

DI-6 AC HV; AC Digital Input Module

•

DI-8; Digital I nput Module

•

DM-20; Digital Input/Output Module (for DIO- 20)

•

MI-6; MilliAmp Input Module

•

The OUTPUT modules available are:

AO-4-8-O; Analog Out put Module (with override)

•

AO-4-8; Analog Out put Module

•

DO-4-R-O; Relay Output Module (with override)

•

DO-4-R; Relay Output Module

•

DO-6-TR; Triac Output M odule

•

LO-2-O; Lighting O utput Module (with override)

•

LO-2; Lighting O utput M odule

•

The MIXED modules available are:

AC-1; Door, Access Control, Wiegand Module

•

AC-1-ABA; Door, Access Control, ABA Module

•

The DISPLAY modules available ar e:

LB-8; 8-Channel LED Bar Dis play / 8 Push Button Module

•

LS-8; 8-Channel, 3 Digit 7- S egm ent LED Dis play / 16 Push Button Module

•

LC-1; 2-Line LCD Display/ 12 P us h B utt on M odule

•

VM-1; Voice Record and Playback Module

•

GA-40; Graphic Annunc iator Panel

•

Continuum I/O System Reference

3

Mechanical Installation

q

Each I/O module, except the Display v ar iety, is enclosed in the same standard plas tic
case that is designed to be mounted on a standard DIN rail or fastened to a panel.

Note: In order to meet agen cy requirements, it is necessary that the modules along
with the power supply and controller be housed in another metal enclosure i.e., a
NEMA box or the new Andover Controls Cont in uu m enclosure.

The standard I/O module plastic case is illustrated below:

Status Indicators
& some switches

Status indicat or s and oper ator switches are located on the indicat or panel. Other
switches available for m odule c onfiguration may be access ed by lifting the hinged door to
the module as shown.

Connections to
controlled/sensed

uipment

e

4

Andover Controls

Wiring to controlled points or sensors is accomplished via a standard removable screw
terminal block locat ed at the bottom of the module behind the door. A n open area at the
bottom of the case allows wires to exit in an appropriate manner.

On the back of each module are molded DIN r ail guide fingers. The design allows the
module to easily hook onto and s lide along a s tandard DIN rail.

Locking Fingers

With the mounting brack ets extended outward, hook the module ont o the DI N r ail as
shown below:

Continuum I/O System Reference

5

Slide the module into posit ion.

Press the lower mounting bracket inward until it locks the module in place.

Press the upper brac k et int o its loc k ed pos ition as well.

Once the module is in the desired pos ition, it is locked to the rail by pushing the bot tom
clamps inward. After the bottom is secure, press the top clamp inward to c om plete the
operation.

6

Andover Controls

Overall Dimens ions

The overall dimensions of the standard I/O case are as shown:

6.70''

(170.2 mm)

2.50 ''

(63.5 mm)

3.50 ''

(88.5 mm)

Continuum I/O System Reference

7

Enclosure-Mounted Modules

The modules that are designed t o be m ounted to the new Andover Controls Continuum
enclosure fit int o openings left by removing panels in the front door .

The new enclosure provides a plac e to mount a power supply, CPU and up to ten DIN rail
mounted I/O modules. Sev er al dis play m odules c an be aff ix ed to the front panel.

The enclosure is a 6” deep NEMA box with int egr al dis play panels , DIN rails, cable
troughs and a batter y st or age c ompart m ent.

DIN Rail

Cable Trough

Battery
Storage

The enclosure feat ur es three DIN rails and cable management accessor ies . Use of t he
new enclosure is not required, however, it provides a convenient method of constructing
small local systems.

8

Andover Controls

The front door of the enclosur e c ontains removable sections into whic h s pec ial oper ator
display and control modules m ay be m ounted. Alternately, Plexiglas panels m ay be us ed
to view the status lights of all internal modules when the door is closed.

Removable
Display Panels

Spacers for
Additional Displays

Continuum I/O System Reference

9

Power-CPU Connections

The Continuum NetCont r oller CP U m odule inc ludes a c onnec tor on the upper right
side of its case for further distribution of the 24 VDC input power and special I/O
communications signals to all I/O modules. Continuum I/O modules us e these signals
for power and communications as well.

The power-I/O connec tor is a five pin male assembly that is designed to easily ins er t
directly into t he left s ide ( input) connector of any I/O module. The signals wit hin that
connector are as follows:

PIN Function

5 +24 VDC
4 24 VDC Return
3 Ground
2 Comm B
1 Comm A

5

The system power supply gener ates a +24 VDC source for all modules in the system.
This power source is received through the input power connector on the left side of
the CPU module and sent through t o pins 4 and 5 of this connec tor. Pin 3 (Ground) is
intended as a signal ground connect ion.

Communications between the CPU and I/O modules is through a two-signal s er ial
interface that can be internally configured as eit her RS 485 or Echelon LON FT T-10.
Pins 1 and 2 (Comm B and Comm A) provide the elect r ic al c onnec tion for this
interface.

10

Andover Controls

Connection of I/O Modules

y

The CPU can directly connect to I/O without the use of cables through a syst em of
built-in plugs and jacks. All I/O modules include two complementary module inter­connectors.

Creating a system is as simple as physically plugging the modules together.

Power Suppl

CPU

I/O

I/O

In vertical extended systems, I/O modules may be located above or below other
modules. In this case, cable as s em blies br idge the I/O modules together.

The cable necessary to connect the CPU and external I/O modules is five c onduc tor
and would be attached using a plug-in screw terminal connector. Connection
between the modules is one-to-one straightforward wir ing as s hown below:

5
4
3
2

5
4
3
2

This connector is available f r om A ndov er Controls under part number 01-2050-283;
Wieland manufactur es it under par t number 25.340.0553.0.

Continuum I/O System Reference

11

Maximum Number of I/O Modules

There is no operational limit to the number of I/O modules connected to the CPU except
the capacity of the power s upply . It is pos s ible to insert auxiliary power supplies int o the
I/O bus to increase the num ber of modules s uppor ted.

To determine the maximum number of I/O modules your system can support, subtract the
power requirements f or eac h module fr om the max im um available f r om y our power
supply.

PS 120/240 AC 50 U, UPS power supply provides 35 Watts of power

•

PS 120/240 AC 50, non-UPS power s upply pr ov ides 50 Watts of power

•

PS –48 DC 50, Battery operated power s upply pr ov ides 50 Wat ts of power

•

NetController requires 15 Watts of power

•

Start by subtracting the NetController from the power available from your power supply.

PS 120/240 AC 50 U

35 – 15 = 20 Watts of available power for I/ O

PS 120/240 AC 50

50 – 15 = 35 Watts of available power for I/ O

PS –48 DC 50

50 – 15 = 35 Watts of available power for I/ O

The power requirements for each I/O module is listed in the

Reference Guide

ACC # 30-3001-499 and can be found on individual dat a s heets.

Continuum I/O System

Maximum Length of I/O Bus

A repeater is necess ar y if the cable lengths get too long. The following are
recommendations regar ding c able lengths for both RS-485 and FTT- 10 interfaces:

RS-485 Repeater required if lengt h is >2000 ft. (610 m) or after 32 modules.
FTT-10 Repeater required if lengt h is >8858 ft. (2700 m) bus topology

>1640 ft. (500 m) free topology

Connecting Remote I/O Modules with RS-485

The Continuum system allows I/ O modules to be placed in a remote location from the
CPU (NetController) . However, long cable lengths can cause s ignal c om m unic ations
problems on the Power/I- O bus.

When locating an I/O module remotely it is necessary to add a 120

terminator to the

Ω

bus to compensate for the distance. The terminator must be connec ted at both ends of
the bus for proper operation.

12

Andover Controls

Terminat i on Guidel ine s

The following are typic al ins tallations that indicate the placement of the terminator:

Simple CPU and 1 remote I/O Module:

The I/O Bus that needs to be term inated is the one formed by the cable attaching the
remote module to the CPU. In this c as e, a t erminat or r es is tor is connected across the
communications lines ( pins 1 & 2) directly at the NetController and again at t he r em ote
I/O module.

CPU

5
4
3
2
1

120 Ω
Resistor

120 Ω
Resistor

5
4
3
2
1

Remote

I/O

Module

Continuum I/O System Reference

13

CPU with local and 1 remote I/O Module:

The I/O Bus that needs to be term inated is the one formed by the cable that starts at
the NetController and ends at the remote module. The bus that extends from the
NetController thr ough the local I/O stack does not need terminat ion. In this case, the
terminator res is tor is connected directly across the c om m unic ations lines ( pins 1 & 2) at
the NetController and again at the remote I/O module.

CPU

120 Ω
Resistor

Local

I/O

5
4
3
2
1

5
4
3
2
1

Local

I/O

120 Ω
Resistor

5
4
3
2
1

Remote

I/O

Module

14

Andover Controls

CPU with local and several rem ote I/O Modules:

The I/O Bus that needs to be term inated is the one formed by the cable that starts at
the NetController and ends at the first remote module. The bus that extends from the
NetController thr ough the local I/O stack and the one that st arts at t he firs t rem ote
module and extends through s ubs equent modules do not need termination. In this
case, the terminat or r es istor is connect ed dir ec tly across the communications lines
(pins 1 & 2) at the NetController and again at the first remote I/O module.

CPU

120 Ω
Resistor

Local

I/O

5
4
3
2
1

5
4
3
2
1

Local

I/O

120 Ω
Resistor

5
4
3
2
1

Remote

I/O

Module

5
4
3
2
1

Remote

I/O

Module

Continuum I/O System Reference

15

CPU with two remote modules s epar ated by distance:

The I/O Bus that needs to be term inated is the one formed by both cables on either
end of the first remote I/O m odule. In this case, the bus begins at the NetCont r oller ,
flows by the first remote module and ends at the second. The terminat or resis tor is
connected directly ac r os s the communications lines (pins 1 & 2) at the NetContr oller
and again at the last remote I/ O module. If the last module is actually a stack of
directly connect ed I/ O modules , the terminator is placed at the fir s t module of the
stack as indicated in the scenario described on the previous page.

CPU

5
4
3
2
1

120 Ω
Resistor

5
4
3
2
1

Remote

I/O

120 Ω
Resistor

Module

5
4
3
2
1

Remote

I/O

Module

16

Andover Controls

Individual Module Characteristics

This section of the document describes the various I/O modules and presents interfacing
information. E ac h module is pres ented in its own mini-section. The part number
designator for the module being described is printed on the outer edge of each page.

General Wiring Concerns for All Modules

Do not remotely ground any part of t he input sensor wiring. Remote grounds c onnec ted
to the return term inal c ould m ak e the syst em oper ate incorrectly or damage the
equipment. The signal r eturn is not true earth ground. It is an elect r onic r eferenc e point
necessary to int er pr et t he sensor pr oper ly .

It is recommended that you r un input wiring in a conduit separate from AC power or
output wiring and avoid long wiring runs .

For reliable input operat ion, follow these input wiring guidelines :

Never lay wires across the surfac e of a printed circuit board.

•

Wires should never be wit hin 1 in. or 25 mm of any com ponent on a printed

•

circuit board.
Use shielded input wire.

•

Terminate the shield of the input wires at one end of the run only—preferably at

•

the end where your I/O module is located.
Be careful when str ipping wir e not to drop small pieces of wire inside the cabinet.

•

Don’t run your input wiring in the same conduit with AC power.

•

Don’t run your input wiring in the same conduit with your output wiring.

•

Grounding the Modules

Each module includes a screw terminal connection for Earth ground. It is important that
this connection be made as c los e to the module as pos s ible.

Caution
Do not externall y ground any inpu t sign al connected to the module. This may
damage the unit. Sign al return terminals are not connected to Earth Ground.

Continuum I/O System Reference

17

18

Andover Controls

UI-8-10

The UI-8-10,

Continuum

’s universal input module, pr ov ides 8 univ er s al inputs, software
configurable as voltage, thermistor, digit al, or counter point types. Each point c an als o be
configured as a supervis ed input for security monitoring, pr ov iding s epar ate indication of
alarm and trouble conditions . This module is a perfect choice f or any mix of temper ature,
pressure, flow, status points, and similar inputs in a control system, with a 0-5 volt input
range and 10 bit A/D conver s ion.

The UI-8-10-10V m odel is available f or 0- 10V applic ations. It provides t he identical point
type selection; but is equipped with individual voltage divider DIP switches on each input,
allowing each to be configured f or a 0- 10 v olt range.

FEATURES

POWER
COMM

STATUS

USE COPPER CONDUCTORS ONLY

USE COPPER CONDUCTORS ONLY

SWITCH SETTINGS

INPUT TYPE REFERENCE RANGE

TEMPERATURE ON 5 V
5V RANGE OFF 5 V
10V RANGE OFF 10 V

REFERENCE
RESISTOR

READER

OFF ON

POWER

+ 5V, 100mA

+ 12V, 180mA

SUPERVISED
INPUTS(0-5V)

READER

+

V

IN1

123456789101112

12

1

L

G

DC
A

N

E

L

A

T

D

D

K

A

U

ANALOG INPUTS

X

/

/

1

0

IN3 IN4 RETIN2 RET IN5 IN6 RET IN7 IN8 RET

4

56

3

ON

OFF

AUTO

IN1
IN2
IN3
IN4
IN5
IN6
IN7

23

D

IN8

O
O
R

7

R
E
X

8

1-DOOR

VOLTAGE
RANGE

5V 10V

CONTACT RATING:

DIGITAL OUTPUTS

1-DOOR

R
E
T

10 11 12

9

COMMISSION

RESET

UI-8

ON

OFF

AUTO

13 14 15

OUT 2

OUT2

•

•

•

•

8 Universal Inputs
10 bit Resolution
0-5V or 0-10V Input Range
Supports Voltage, Thermistor, Digital,

Counter and Supervised Elec trical
Types

•

Pull-up Resistor Disable S witches

Continuum I/O System Reference

19

UI-8-10

SPECIFICATIONS

ELECTRICAL

Power Consumption:

Overload Protection:

INPUTS

Number of Inputs:
Input Types:
Input Protection:

Input Impedance:

Input Connections:
Voltag e : UI-8-10 (0-5V) UI-8-10-10V (0-10V mo d e)

Range: 0-5 volts 0-10 volts
Resolution: 5 mV 10 mV
Accura c y : ±15 mV (±0.3% FSR) ±40 mV (±0.4% FSR)
Filtering: Corner Frequency at 15 Hz, –20 db/decade
Calibration: Permanent (factory)

0.7 Watt at 24VDC max.; normally provided by
supply module.

0.5A resettable fuse with transient voltage suppressor (TVS) and
reverse polarity protection.

8 Universal inputs; 10 bit resolution
Voltage, Thermistor, Digital, Counter, and Supervised
24V AC/DC allowed to any single input

(40V transient voltage suppressor on each input – UI-8-10-10V)
5 MΩ w/pull-up disabled; 10 KΩ w/pull-up enabled – UI-8-10

(4.4 KΩ w/pull-up enabled in 0-10V mode UI-8-10-10V)
Two-piece, 13-position removable terminal block

Continuum

power

Thermistor:

Type: 10 KΩ, Type III Thermistor
Range: -30 to 230°F

Resolution: 40 to 100°F range 0.20°F typical

Accuracy: 40 to 100°F range ± 1.0°F (includes 0.36° error for thermistor)

Digital & Counter:

Input Type: Contact Closure
Frequency: 4 Hz max.
Pulse Width: 125 ms min.

Supervised:

Input Type: Single or Double Resistor Supervision, Parallel or Series Circuit

20

Andover Controls

(-34 to 110°C)

(4 to 38°C) (0.11°C typical)

(4 to 38°C) (±0.55°C)

UI-8-10

I/O Connecti ons

The actual input connections are locat ed on a twelve-position removable screw terminal
connector located at the bottom of the module. Input wires s hould enter from either the
top or bottom wiring tr oughs , and should c om e from the left side of the rack (by
convention).

The inputs are labeled IN1, IN2, IN3, and so forth. Each pair of inputs is f ollowed by a
connection labeled RET f or the input signal return, resulting in a sequence of IN1, IN2,
RET, IN3, IN4, RET, and so on. For any given input, you should use the closest ret ur n
terminal either bef or e or aft er that input—the next return terminal goes with the next two
inputs, and so on.

The twelve-posit ion c onnec tor allows for eight inputs and f our signal returns.
The diagram below indicates wher e eac h input number is located in the term inal bloc k .

Shield/Earth G r ound

1. IN 1

2. IN 2

3. RETURN

4. IN 3

5. IN 4

6. RETURN

7. IN 5

8. IN 6

9. RETURN

10. IN 7

11. IN 8

12. RETURN

POWER
COMM

STATUS

COMMISSION

RESET

UI-8

USE COPPER CONDUCTORS ONLY

USE COPPER CONDUCTORS ONLY

INPUT TYPE REFERENCE RANGE

TEMPERATURE ON 5 V
5V RANGE OFF 5 V
10V RANGE OFF 10 V

READER
POWER

+

V

IN1

123456789101112

12

SWITCH SETTINGS

REFERENCE
RESISTOR

OFF ON

+ 5V, 100mA

+ 12V, 180mA

READER

L

G

DC
A

N

E

L

T

D

D

K

A
/

/

1

0

IN3 IN4 RETIN2 RET IN5 IN6 RET IN7 IN8 RET

Continuum I/O System Reference

4

56

3

1-DOOR

ON

OFF

AUTO

IN1
IN2
IN3
IN4

SUPERVISED

IN5

INPUTS(0-5V)

IN6
IN7

1

23

D

IN8

A

R

O

U

E

O

ANALOG INPUTS

X

X

R

7

8

R
E
T

9

10 11 12

ON

OFF

AUTO

VOLTAGE
RANGE

5V 10V

CONTACT RATING:

DIGITAL OUTPUTS

1-DOOR

13 14 15

OUT 2

OUT2

21

UI-8-10

Input Circ uitr y

UI-8-10 Inputs ar e essent ially v oltmeters. Universal input s can be conf igur ed through
software to become one of fiv e diff er ent input circuits:

Temperature

♦

Voltage

♦

Digital

♦

Counter

♦

During configuration, the value of the Electrical Type att r ibute you select tells the
controller how to int er pr et the reading from each input. Each Universal input is read every
100 milliseconds. This r eading is independent of the controller s c an time.

The following is a simplif ied s c hem atic of both the UI-8-10 and the UI-8-10- 10V Univ er s al
inputs:

Vref

Vref

IN x

RET

Rref

Swdis

UI-8-10

IN x

RET

2.21K

0-5V

Range

0-10V

2.21K

UI-8-10-10V

Rref

Swdis

The main differenc e between the two is the UI-8-10-10V circuit inc ludes a s witch
selectable front - end v oltage divider that effectively divides the 10V input signal by two.

22

Andover Controls

UI-8-10

Each input includes a low-pass filter after the pull-up form ed by a series r es is tor and a
parallel capacitor. The resistor is utilized f or ov er-voltage protection in limit ing c ur r ent t o
two protection diodes ( not shown). Note also that all input returns ar e c ombined and must
be directly connect ed to earth ground. It is possible to have mor e than one input s har e a
single return wire. K eep in m ind that the current through each input is approx im ately

0.3mA, so voltage drops oc c ur with long r uns of sm all gauge wir e.

Pull-up Referen ce Resistor Selection Switches

In some measuring instances it is desirable that there be no pull-up resistor. Instead of
physically removing or c utting the resistor off the printed circuit board, the input module
includes a pull-up resistor s elec tion switch (labeled Swdis in t he diagr am ) for each input
position. This s witch allows you to select whether or not you want a pull-up res is tor in the
circuit. A small 8-pos ition switch module is accessible f r om the front of the module when
the door is opened.

Slide marker
moves left and right

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These switch modules are com m only c alled “ DIP Switches” and require a small object
such as the tip of a pen or a small screwdriver to operate them. Each switch position acts
as a “slide switch”. Pr es s ing the rais ed s lide m ar k er to t he side mark ed “ on” closes or
enables the switch. To open or dis able the switch position, press the s lide m ar k er over to
the “off” side.

Continuum I/O System Reference

23

UI-8-10

Input Voltage Range Selection Switches (UI-8-10-10V Only)

The UI-8-10-10V m odule allows y ou to choose from two input voltage ranges. S elec tion
is accomplished by using a switch arrangement that is similar to the operation of the pull­up resistor swit c hes. The Voltage Range switches allow you to select a range (0-5 V ) or
(0-10 V) for each input.

The 0-5V range allows connections to signals that do not exceed 5. 00V . T he 0-10V range
allows connection to signals up to 10.00V. In this mode the circuit actually us es the same
input measuring circuit as the 0-5V range, however, it div ides the voltage present by two
thereby limiting t he internal circuitry to 0-5V. When you r ead a 0- 10V input the actual
reading will be 0-5V. You must adjust your readings for the higher range v ia formula.

Switching to 10V input s dramatically lowers the impedance of the input to

This small 8-posit ion s witch module is located to the right of the pull-up selector switch
and is accessible from the f r ont of the m odule when the door is opened.

4.4 KΩ.

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Andover Controls