Andover Controls AO-4-8 Technical Manual
UN-RELEASED
REVIEW COPY
2/20/98
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1998, Andover Controls Corporation
All Rights Reser ve d
No part of this publication may be reproduced, read or stored in a retrieval
system, or tr ansmitted, in an y for m or by any means, electron ic, mechan ical,
photocopying, re cord i ng, or otherwise, without prior written permission of
Andover Controls Corporation.
Produced in th e United States of America.
Infinity is a trademark of Andover Controls Corporation. All other trademarks
are the proper ty of their respective owners.
Continuum I/O R eference, Version: REVIEW February, 1998
Andover Controls part number: 30-3001-499
Th e i nforma tion in this book is furn ish ed for informat ion a l pur poses onl y, 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 Do cumen t 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
(978) 470-0555
fax: (978) 470-0946
Andover Controls Corporation
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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 pr ésent app areil nu mériqu e n ’é met pas de bruit s radioél e ctriq ue s dé passan t les limi tes
applicables aux appareils numériques de la class A prescrites dans le Règlement sur le brouillage
radioélectrique édicté par le ministère des Communications du Canada.
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Continuum I/O System Reference
Andover Controls Corporation
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Contents
Introduction......................................................................1
Mechanical Installation....................................................4
Overall Dimensions....................................................................7
Door-Mounted Modules..............................................................8
Power-CPU Connections...............................................10
Conne c tion of I/O Mo du le s.......................................................11
Maxim um 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
Termina t i on Guidel ine s............................................................13
Individual Module Characteristics................................17
General Wiring Concerns.........................................................17
INPUT Modules
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
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Continuum I/O System Reference
Andover Controls Corporation
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TCX 865
ÈNTINUUM
I/O Systems
This manual describes the installat ion, care and use of all Continuum I/O modules.
The
Continuum
various combinat ions of DIN rail-mounted moduleshigh density I/O, CPU and power
supply, and your c hoic e of several user interf ac e modulesin a
to meet your building’s control and monitoring needs. With the
your network gr ows , sim ply add or replace I /O m odules as needed.
Ethernet-based intelligent building system allows you to mix and match
single
Continuum
controller location
system, as
Continuum
The
convection cooling, and a 3-position fr ont 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
mountingno tools r equir ed. These fasteners als o s nap into a locked position for panel
mounting. I nput and output connectors ar e located at the bottom of each I/O module and
are removable for eas y field acc es s and m aintenance. All
designed for mounting in an optional NEMA 1-style
The
Continuum
module. Like all
connectors on either side so network expansion is quic k and eas y . Both power
transmiss ion and c om m unic ation signals between the
NetController CP U m odule, and all I/O modules feed thr ough this connection. For added
convenience in cert ain applic ations, such as door c ontrol or lighting control, a s ingle
module or groups of I/ O modules c an be r em otely loc ated and connected using approv ed
cable and powered from a loc al 24 V DC power s upply . Eac h I/ O module features its own
push-button for quick and easy network commis s ioning.
This document covers the standard Input and Output modules. Fo r in format io n
regarding the speci al Continuum enclosure door- mount ed display modules
consult the Andover Con t rol s
I/O modules featur e a sleek, lightweight casing designed f or natural
I/O modules communicate with the
Continuum
modules, the I/ O modules s nap together directly via built-in
Continuum Display Modul e Ref erence
Continuum
Continuum
Continuum
Continuum
enclosure.
NetController CP U
modules are
power supply module,
.
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Continuum I/O System Reference
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 electrical communic ations bus. Each functional com ponent is
enclosed in a plastic c as e c ontaining all of its connections to the outside world. Modules
are connected t o a centr al c ontroller via a standard fiv e c onduc tor connector.
The Continuum sy stem inc ludes at least one power supply and a single cont r oller
module. I/O m odules pr ov ide the controller with the ability to interface with t he outside
world. They c onnec t direc tly and communicate with the CPU. T he following is a typical
architecture drawing of a Cont inuum System:
Power Supply
Controller
I/O Modules
Continuum I/ O modules ar e av ailable in INPUT, OUTPUT, MIXED and DISPLAY
varieties.
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The INPUT modules av ailable ar e:
UI-8-10; Univ er s al Input Module
•
UI-8-10-10V; Universal Input Module
•
DI-6 AC; AC Digital Input Module
•
DI-6 AC HV; AC Digital Input Module
•
DI-8; Digit al Input Module
•
DM-20; Digital Input/Output Module (for DIO-20)
•
MI-6; MilliAmp Input Module
•
The OUTPUT modules available ar e:
AO-4-8-O; Analog Output Module (with override)
•
AO-4-8; Analog O utput Module
•
DO-4-R-O; Relay Out put Module (with override)
•
DO-4-R; Relay Out put Module
•
DO-6-TR; Triac Output Module
•
LO-2-O; Light ing Output Module (with over r ide)
•
LO-2; Light ing Output Module
•
The MIXED modules av ailable ar e:
AC-1; Door, Access Control, Wiegand Module
•
AC-1-ABA; Door, Access Control, ABA Module
•
The DISPLAY modules av ailable ar e:
LB-8; 8-Channel LED B ar Dis play / 8 Push Button Module
•
LS-8; 8-Channel, 3 Digit 7-Segment LED Display/ 16 Push Butt on M odule
•
LC-1; 2-Line LCD Display/ 12 Push Button Module
•
VM-1; Voice Record and Playback Module
•
GA-40; Graphic A nnunc iator Panel
•
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Continuum I/O System Reference
3
Mechanical Installation
q
Each I/O module, exc ept the Display variety, is enc los ed in the same standard plastic
case that is designed t o be m ounted on a standard DIN rail or fastened to a panel.
Note: In order to meet agency requirements, it is necessary that t he modules along
with the power supply and controller be housed in another metal enclosure i.e., a
NEMA box or the new Andover Controls Con t in uu m enclosure.
The standard I/ O module plas tic case is illustrat ed below:
Status Indicators
& some switches
Status indic ators and operator switc hes ar e located on the indicator panel. Ot her
switches available for module configuration may be accessed by lifting the hinged door to
the module as shown.
Connections to
controlled/sensed
uipment
e
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Wiring to controlled points or sensors is accomplished via a standard removable screw
terminal block loc ated at the bottom of the module behind t he door . An open area at the
bottom of the c as e allows wires to exit in an appropriate manner.
On the back of each module are molded DIN rail guide fingers. The design allows the
module to easily hook onto and slide along a standard DI N rail.
Locking Fingers
With the mounting br ac k ets extended outward, hook the module onto the DIN rail as
shown below:
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Continuum I/O System Reference
5
Slide the module into pos ition.
Press the lower mounting bracket inward until it locks the module in place.
Press the upper br ac k et int o its loc k ed pos ition as well.
Once the module is in the des ir ed pos ition, it is locked to the rail by pushing t he bottom
clamps inward. A ft er the bottom is secure, press the top clamp inward to complete the
operation.
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Overall Dimensions
The overall dimensions of the standard I/O case are as shown:
6.70''
(170.2 mm)
2.50 ''
(63.5 mm)
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3.50 ''
(88.5 mm)
Continuum I/O System Reference
7
Enclosure-Mounted Modules
The modules that are des igned to be mounted to the new Andover Contr ols Continuum
enclosure fit into openings left by removing panels in the front door.
The new enclosure prov ides a plac e to mount a power supply, CPU and up to ten DIN rail
mounted I/O m odules . 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 integral display panels, DIN rails, cable
troughs and a battery storage compartment.
DIN Rail
Cable Trough
Battery
Storage
The enclosure f eatures three DIN rails and cable management accessories. Use of t he
new enclosure is not r equir ed, however, it provides a c onv enient method of construct ing
small local systems.
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The front door of the enclos ur e c ontains removable sections into which special operator
display and control m odules m ay be m ounted. Alternately, Plex iglas panels m ay be us ed
to view the stat us lights of all internal modules when t he door is closed.
Removable
Display Panels
Spacers for
Additional Displays
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Continuum I/O System Reference
9
Power-CPU Connections
The Continuum Net Controller CPU module includes a c onnec tor on the upper right
side of its case f or fur ther distribution of the 24 VDC input power and s pec ial I/O
communications s ignals to all I/O modules. Continuum I/ O modules us e these signals
for power and comm unic ations as well.
The power-I/O c onnec tor is a five pin male assembly that is designed to eas ily ins er t
directly int o the left side (input) connect or of any I/ O module. The signals within that
connector are as follows:
PIN Function
5 +24 VDC
4 24 VDC Return
3 Ground
2 Comm B
1 Comm A
The system power s upply gener ates a +24 VDC source for all modules in the syst em.
This power sourc e is received through the input power c onnec tor on the left side of
the CPU module and sent through to pins 4 and 5 of this connector. Pin 3 (Ground) is
intended as a signal ground connec tion.
Communications between the CPU and I/O modules is through a two-signal serial
interface that can be internally conf igur ed as either RS 485 or Echelon LON FTT-10.
Pins 1 and 2 (Comm B and Comm A) provide the electrical connection for this
interface.
5
10
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Connecti on of I/O Modul es
y
The CPU can directly c onnec t to I/O without the use of cables thr ough a system 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 c as e, cable as s em blies br idge the I/O modules together .
The cable necessar y to connect the CPU and external I/O modules is f iv e c onduc tor
and would be attached using a plug-in screw terminal connector. Connect ion
between the modules is one- to-one straightfor war d wir ing as s hown below:
5
4
3
2
This connect or is available f r om A ndov er Controls under part number 01-2050- 283;
Wieland manufactures it under part number 25.340.0553.0.
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5
4
3
2
Continuum I/O System Reference
11
Maximum Number of I/O Modules
There is no operat ional lim it to the number of I/O modules connected to the CPU except
the capacity of t he power s upply . It is pos s ible to insert auxiliary power supplies into the
I/O bus to increase the number of modules support ed.
To determine the maximum number of I/O modules your system can support, subtract the
power requirements for each module from the maximum available f r om y our power
supply.
PS 120/240 AC 50 U, UPS power supply pr ov ides 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 supply provides 50 Wat ts of power
•
NetController r equir es 15 Watts of power
•
Start by subt r acting the NetController from the power av ailable from your power supply .
PS 120/240 AC 50 U
35 – 15 = 20 Watts of available power f or I/ O
PS 120/240 AC 50
50 – 15 = 35 Watts of available power f or I/ O
PS –48 DC 50
50 – 15 = 35 Watts of available power f or I/ O
The power requirements for each I/O module is list ed in the
Reference Guide
ACC # 30-3001-499 and can be found on indiv idual data sheets.
Continuum I/O System
Maximum Length of I/O Bus
A repeater is nec es s ar y if the cable lengths get too long. The following are
recommendations r egar ding c able lengths for both RS - 485 and FTT- 10 interfaces:
RS-485 Repeater required if length is >2000 ft. (610 m) or after 32 m odules .
FTT-10 Repeater required if length is >8858 ft. (2700 m) bus topology
>1640 ft. (500 m) free topology
Connecting Remote I/ O Modules with RS-485
The Continuum sy stem allows I/ O modules to be placed in a remote location from the
CPU (NetContr oller ) . However, long cable lengths can c aus e 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 terminat or m ust be c onnec ted at both ends of
the bus for proper operation.
12
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Termina t i on Guidel ine s
The following are t y pic al ins tallations that indic ate the placement of the terminat or :
Simple CPU and 1 remot e I/O Module:
The I/O Bus that needs to be terminated is the one formed by the cable at taching the
remote module t o the CPU. I n 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 the remote
I/O module.
CPU
5
4
3
2
1
120 Ω
Resistor
120 Ω
Resistor
5
4
3
2
1
Remote
I/O
Module
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Continuum I/O System Reference
13
CPU with local and 1 remote I/O Module:
The I/O Bus that needs to be terminated is the one formed by the cable t hat starts at
the NetContr oller and ends at the remote module. The bus that ext ends from the
NetController through the local I/O stac k does not need termination. In this cas e, t he
terminator r es is tor is connected direct ly acros s the c om m unic ations lines ( pins 1 & 2) at
the NetContr oller 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
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CPU with local and sever al r em ote I/O Modules:
The I/O Bus that needs to be terminated is the one formed by the cable t hat starts at
the NetContr oller and ends at the first remote module. The bus that extends from the
NetController through the local I/O stac k and the one that starts at the first remote
module and extends t hr ough s ubs equent modules do not need terminat ion. In this
case, the term inator resistor is connected dir ec tly across the communicat ions lines
(pins 1 & 2) at the NetContr oller 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
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Continuum I/O System Reference
15
CPU with two remote m odules s epar ated by distance:
The I/O Bus that needs to be terminated is the one formed by bot h cables on eit her
end of the first remot e I/O m odule. In this case, the bus begins at the Net Controller,
flows by the firs t rem ote module and ends at the second. The term inator resistor is
connected directly across the communicat ions lines ( pins 1 & 2) at the Net Controller
and again at the last r emote I/ O module. If the last module is actually a stac k of
directly connec ted I/O modules, the term inator is placed at the first 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
Module
120 Ω
Resistor
5
4
3
2
1
Remote
I/O
Module
16
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Individual Module Characteristics
This section of the document describes the various I/O modules and presents interfacing
information. Each module is presented in it s own mini-sec tion. 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 gr ound any part of t he input sensor wiring. Remote gr ounds c onnec ted
to the return t er m inal c ould m ak e the syst em oper ate incorrectly or damage the
equipment. T he s ignal r eturn is not true earth ground. It is an elect r onic r eferenc e point
necessary t o interpret the sensor properly.
It is recommended that you run input wiring in a conduit s epar ate from AC power or
output wiring and avoid long wir ing r uns .
For reliable input oper ation, follow thes e input wiring guidelines:
Never lay wires acr os s the surfac e of a printed circuit board.
•
Wires should never be within 1 in. or 25 mm of any component on a printed
•
circuit board.
Use shielded input wire.
•
Terminate the shield of the input wires at one end of the r un only—preferably at
•
the end where your I/O module is loc ated.
Be careful when stripping wire not to drop small piec es of wire ins ide the cabinet.
•
Don’t run your input wir ing in the same conduit with AC power.
•
Don’t run your input wir ing in the same conduit with your output wir ing.
•
Grounding the Modules
Each module includes a screw terminal connection for Earth ground. It is important that
this connect ion be m ade as c los e to the module as pos s ible.
Caution
Do not externally ground any input signal connected to the modul e. This may
damage the unit. Sign al return terminals are not connected to Eart h G round.
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Continuum I/O System Reference
17
18
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UI-8-10
The UI-8-10,
Continuum
’s universal input m odule, provides 8 universal inputs, software
configurable as voltage, thermis tor, digital, or counter point types. Each point can also be
configured as a super v is ed input for security monitor ing, providing separate indic ation of
alarm and trouble conditions. This module is a perfect choice for any mix of temperat ur e,
pressure, flow, status points, and similar inputs in a cont rol system, with a 0-5 volt input
range and 10 bit A/D c onv er s ion.
The UI-8-10- 10V m odel is available f or 0- 10V applic ations. It provides the identical point
type select ion; but is equipped with individual voltage div ider DIP switches on each input,
allowing each to be configur ed for a 0-10 volt range.
FEATURES
POWER
COMM
STATUS
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
G
DC
A
N
T
D
A
/
1
3
IN1
IN2
IN3
IN4
SUPERVISED
IN5
INPUTS(0-5V)
IN6
IN7
1
23
L
E
D
IN8
L
A
O
D
K
U
O
ANALOG INPUTS
X
R
/
0
IN3 IN4 RETIN2 RET IN5 IN6 RET IN7 IN8 RET
4
56
7
ON
OFF
AUTO
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 Input s
10 bit Resolution
0-5V or 0-10V Input Range
Supports Voltage, Thermistor, Digital,
Counter and Supervis ed E lec trical
Types
•
Pull-up Resistor Dis able S witches
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Continuum I/O System Reference
19
UI-8-10
SPECIFICATIONS
ELECTRICAL
Power Consumption:
0.7 Watt at 24VDC max.; normally provided by
supply module.
Continuum
power
Overload Protection:
INPUTS
Number of Inputs:
Input Types:
Input Protection:
Input Impedance:
Input Connections:
Voltage: UI-8-1 0 (0-5V) UI-8-1 0-10V (0-10V mo d e)
Range: 0-5 volts 0-10 volts
Resolution: 5 mV 10 mV
Accuracy: ±15 mV (± 0.3% FSR) ±40 mV (±0.4% FSR)
Filtering: Corner Frequency at 15 Hz, –20 db/decade
Calibration: Permanent (factory)
Thermistor:
Type: 10 KΩ, Type III Thermistor
Range: -30 to 230°F
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
(-34 to 110°C)
Resolution: 40 to 100°F range 0.20°F typical
(4 to 38°C) (0.11°C typical)
Accuracy: 40 to 100°F range ± 1.0°F (includes 0.36° error for thermistor)
(4 to 38°C) (±0.55°C)
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
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UI-8-10
I/O Connections
The actual input connect ions are located on a twelve-position removable screw terminal
connector located at the bottom of the module. Input wir es s hould enter from either the
top or bott om wiring t r oughs , and should c om e from the left side of the rack (by
convention).
The inputs are labeled IN1, IN2, IN3, and so fort h. Eac h pair of inputs is followed by a
connection labeled RET for the input signal retur n, resulting in a sequence of I N1, I N2,
RET, IN3, IN4, RET, and s o on. F or any given input, you should use the closest r eturn
terminal either before or after that input —the nex t return terminal goes with t he next two
inputs, and so on.
The twelve-pos ition connector allows for eight inputs and four signal ret ur ns .
The diagram below indicat es wher e eac h input number is located in the terminal block.
Shield/Eart h Ground
1.
2.
3.
4.
5.
6.
7.
8.
9.
IN 1
IN 2
RETURN
IN 3
IN 4
RETURN
IN 5
IN 6
RETURN
10. IN 7
11. IN 8
12. RETURN
READER
POWER
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POWER
COMM
STATUS
COMMISSION
RESET
UI-8
USE COPPER CONDUCTORS ONLY
USE COPPER CONDUCTORS ONLY
ON
OFF
AUTO
IN1
IN2
IN3
IN4
SUPERVISED
IN5
INPUTS(0-5V)
IN6
IN7
23
D
IN8
R
O
E
O
X
R
7
8
1-DOOR
VOLTAGE
RANGE
5V 10V
CONTACT RATING:
DIGITAL OUTPUTS
1-DOOR
R
E
T
10 11 12
9
SWITCH SETTINGS
INPUT TYPE REFERENCE RANGE
TEMPERATURE ON 5 V
5V RANGE OFF 5 V
10V RANGE OFF 10 V
REFERENCE
RESISTOR
OFF ON
+ 5V, 100mA
+ 12V, 180mA
READER
+
G
DC
A
N
V
T
D
A
/
1
IN1
Continuum I/O System Reference
123456789101112
12
3
1
L
E
L
A
D
K
U
ANALOG INPUTS
X
/
0
IN3 IN4 RETIN2 RET IN5 IN6 RET IN7 IN8 RET
4
56
OUT 2
ON
OFF
AUTO
OUT2
13 14 15
21
UI-8-10
Input Circuitry
UI-8-10 Inputs are essentially volt m eters. Universal inputs can be conf igur ed through
software to become one of five different input c ir c uits:
Temperature
♦
Voltage
♦
Digital
♦
Counter
♦
During configurat ion, the value of the Electrical Type attribute y ou s elec t t ells the
controller how t o interpret the reading fr om each input . Each Universal input is read ev er y
100 milliseconds. This reading is independent of the controller sc an time.
The following is a sim plified schematic of bot h 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 diff er enc e between the two is the UI-8-10-10V circ uit includes a switch
selectable fr ont-end voltage divider that effectiv ely divides the 10V input signal by two.
22
Andover Controls
Technical Manuals Online! - http://www.tech-man.com
UI-8-10
Each input includes a low- pas s filter after the pull-up f or m ed by a series r es is tor and a
parallel capacitor. The resist or is utiliz ed for over-voltage prot ec tion in limiting current t o
two protection diodes (not shown). Not e als o that all input returns are combined and must
be directly connec ted to earth ground. It is possible to have more than one input share a
single return wire. Keep in mind that the current through eac h input is approximately
0.3mA, so volt age dr ops oc c ur with long r uns of sm all gauge wir e.
Pull-up Ref erence Resistor Selection Switches
In some measuring inst anc es it is desirable that ther e be no pull-up resis tor. Instead of
physically remov ing or c utting the resistor off the pr inted circuit board, the input m odule
includes a pull-up resistor selection switch (labeled Swdis in the diagr am ) for each input
position. T his s witch allows you to select whether or not y ou want a pull-up r es is tor in the
circuit. A small 8- pos ition switch module is access ible from the front of the module when
the door is opened.
Slide marker
moves left and right
12345678
O N
These switc h modules are c om 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 switc h” . Pr es s ing the rais ed s lide m ar k er to t he side mark ed “ on” closes or
enables the switc h. To open or disable the switch posit ion, press the slide marker over to
the “off ” side.
Technical Manuals Online! - http://www.tech-man.com
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. Selection
is accomplished by us ing a s witch arrangement that is sim ilar to the operation of the pullup resistor s witches. The Voltage Range switc hes allow y ou to select a range (0-5 V) or
(0-10 V) for each input .
The 0-5V range allows c onnec tions to signals that do not exc eed 5.00V. The 0-10V range
allows connection t o s ignals up to 10.00V. In this mode the circ uit actually uses the same
input measuring cir c uit as the 0-5V range, however , it div ides the voltage present by two
thereby limit ing the internal circuitry to 0-5V. When you read a 0-10V input the actual
reading will be 0-5V. You m us t adjust your readings for the higher r ange v ia formula.
Switching to 10V inputs dramatically low ers the imp edance of the input to
4.4 KΩ.
This small 8-pos ition switch module is located to the right of the pull-up selector s witch
and is accessible f r om the f r ont of the m odule when the door is opened.
24
Andover Controls
Technical Manuals Online! - http://www.tech-man.com
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