Spectrum Controls SLC 500 1746sc-INO4i User manual

Owner’s Guide 0300128-03Rev. D
SLC 500
™
I SOLATED
A NALOG O UTPUT M ODULES
Catalog Numbers
1746sc-INO4i
1746sc-INO4vi

Important Notes
1. Please read all the information in this owner’s guide before installing
the product.
2. The information in this owner's guide applies to hardware and
firmware version 1.0 or later.
3. This guide assumes that the reader has a full working knowledge of
the relevant processor.
Notice
The products and services described in this owner's guide are useful in a
wide variety of applications. Therefore, the user and others responsible
for applying the products and services described herein are responsible
for determining their acceptability for each application. While efforts
have been made to provide accurate information within this owner's
guide, Spectrum Controls assumes no responsibility for the accuracy,
completeness, or usefulness of the information herein.
Under no circumstances will Spectrum Controls be responsible or liable
for any damages or losses, including indirect or consequential damages
or losses, arising out of either the use of any information within this
owner's guide or the use of any product or service referenced herein.
No patent liability is assumed by Spectrum Controls with respect to the
use of any of the information, products, circuits, programming, or
services referenced herein.
The information in this owner's guide is subject to change without notice.
LimitedWarranty
Spectrum Controls warrants that its products are free from defects in
material and workmanship under normal use and service, as described in
Spectrum Controls literature covering this product, for a period of 1 year.
The obligations of Spectrum Controls under this warranty are limited to
replacing or repairing, at its option, at its factory or facility, any product
which shall, in the applicable period after shipment, be returned to the
Spectrum Controls facility, transportation charges prepaid, and which
after examination is determined, to the satisfaction of Spectrum Controls,
to be thus defective.
This warranty shall not apply to any such equipment which shall have
been repaired or altered except by Spectrum Controls or which shall have
been subject to misuse, neglect, or accident. In no case shall the liability
of Spectrum Controls exceed the purchase price. The aforementioned
provisions do not extend the original warranty period of any product
which has either been repaired or replaced by Spectrum Controls.

Preface
Who Should Use This Guide....................................................................... iii
What This Guide Covers ............................................................................. iii
Related Allen-Bradley Documents .............................................................. iii
Terms & AbbreviationsYou Should Know ................................................... iv
Overview And
Specifications
Chapter 1
General Features And Benefits....................................................................1
Detailed Specifications.................................................................................2
Installing AndWiringYour
Module
Chapter 2
Avoiding Electrostatic Damage ....................................................................6
Determining Power Requirements ...............................................................6
Setting The DIP Switch ................................................................................7
Selecting A Rack Slot ..................................................................................8
Inserting Your Module Into The Rack ...........................................................8
WiringYour Module ....................................................................................10
ThingsTo Consider Before
UsingYour Module
Chapter 3
HowThe Processor Communicates WithYour Module ..............................13
Channel Update Time ................................................................................13
Temperature Calibration Time....................................................................14
Output Mode Change Time (-INO4vi only) ................................................14
Your Module’s Response To Slot Disabling................................................14
UsingYour Output Module
Chapter 4
EnteringYour Module’s ID Code ................................................................15
Configuring Each Output Channel .............................................................18
Optional:Setting The Output Data Limits (or User-Defined Scale)............21
Controlling Each Output Channel’s Signal .................................................24
Monitoring Each Output Channel...............................................................25
Checking Each Output Channel’s Configuration And Status .....................25
TestingYour Module
Chapter 5
InspectingYour Module ..............................................................................29
Disconnecting Prime Movers .....................................................................30
Powering Up...............................................................................................30
Interpreting The LED Indicators .................................................................31
Interpreting I/O Error Codes ......................................................................31
Troubleshooting..........................................................................................32
Table Of Contents

ii SLC 500
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Isolated Analog Output Modules
MaintainingYour Module
And Ensuring Safety
Chapter 6
Preventive Maintenance.............................................................................33
Safety Considerations................................................................................33
Tables
Table 1. Related Allen-Bradley documents ................................................. iv
Table 2. Electrical specifications—module ...................................................2
Table 3. Electrical specifications—outputs ...................................................3
Table 4. Physical specifications....................................................................3
Table 5. Environmental specifications.......................................................... 4
Table 6. Backplane current consumed .........................................................7
Table 7. Channel update time (channels already enabled) ........................14
Table 8. Output module ID code ................................................................15
Table 9. Channel configuration word details, Output Words 4 and 5 .........18
Table 10. Data format definitions ...............................................................20
Table 11. Channel status word details, Input Words 4 through 7 ...............26
Table 12. LED definition .............................................................................31
Figures
Figure 1.Ferrite EMI suppressor for CE compliance .................................11
Figure 2.Wiring diagrams (showing differential outputs). ..........................12
Figure 3. Output and input scans...............................................................13
Figure 4.Output and input words...............................................................16
Figure 5.Example relationship between output signal and channel data..24
Figure 6.LED block ...................................................................................31
Figure 7.Problem resolution flowchart ......................................................32

Preface
Read this preface to familiarize yourself with the rest of the owner’s
guide. This preface covers:
• who should use this guide
• what this guide covers
• related Allen-Bradley documents
• terms & abbreviations you should know
Who Should UseThis
Guide
Use this guide if you design, install, program, or maintain a control
system that uses Allen-Bradley Small Logic Controllers.
You should have a basic understanding of SLC 500 products. You should
also understand electronic process control and the ladder program
instructions required to generate the electronic signals that control your
application. If you do not, contact your local Allen-Bradley
representative for the proper training before using these products.
WhatThis Guide Covers
This guide covers the 1746sc-INO4i and 1746sc-INO4vi isolated analog
output modules. It contains the information you need to install, wire, use,
and maintain these modules. It also provides diagnostic and
troubleshooting help should the need arise.
Related Allen-Bradley
Documents
Table 1 lists several Allen-Bradley documents that may help you as you
use these products.

iv SLC 500
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Isolated Analog Output Modules
Table 1. Related Allen-Bradley documents
Allen-Bradley Doc. No. Title
1747-2.30 SLC 500 System Overview
SGI-1.1 Application Considerations for Solid State Controls
1770-4.1 Allen-Bradley Programmable Controller Grounding and
Wiring Guidelines
1747-6.2 Installation & Operation Manual for Modular Hardware
Style Programmable Controllers
1747-NI001 Installation & Operation Manual for Fixed Hardware Style
Programmable Controllers
1747-6.4 Allen-Bradley Advanced Programming Software (APS)
User Manual
1747-6.11 Allen-Bradley Advanced Programming Software (APS)
Reference Manual
1747-6.3 Getting Started Guide for Advanced Programming
Software (APS)
ABT-1747-TSG001 SLC 500 Software Programmers’s Quick Reference
Guide
1747-NP002 Allen-Bradley HHT (Hand-Held Terminal) User Manual
1747-NM009 Getting Started Guide for HHT (Hand-HeldTerminal)
SD499 Allen-Bradley Publication Index
AG-7.1 Allen-Bradley Industrial Automation Glossary
To obtain a copy of any of the Allen-Bradley documents listed, contact
your local Allen-Bradley office or distributor.
Terms & Abbreviations
You Should Know
You should understand the following terms and abbreviations before
using this guide. For the definitions of terms not listed here, refer to
Allen-Bradley’s Industrial Automation Glossary, Publication AG-7.1
Attenuation – The reduction in magnitude of a signal as it passes
through a system. The opposite of gain.
Channel – Refers to one of the sets of signal interfaces available on a
module’s terminal block.
Channel update time – For analog outputs, the time required for the
channel to convert the data received from the processor to analog output
signals at the terminals.
Chassis – See rack.

Preface v
Common mode voltage – The voltage difference between the negative
terminal and analog common during normal differential operation.
Common mode voltage range – The largest voltage difference allowed
between either the positive or negative terminal and analog common
during normal differential operation.
Configuration word – Contains the channel configuration information
needed by the module to configure and operate each channel. Information
is written to the configuration word through the logic supplied in your
ladder program.
D/A – Refers to digital-to-analog conversion. The conversion produces
an analog output signal whose magnitude is proportional to the digital
value.
dB (decibel) – Alogarithmic measure of the ratio of two signal levels.
Data scaling - The data format that you select to define the logical
increments of the channel data word.
Data word – A 16-bit integer that represents the value of the analog
output channel. The channel data word is valid only when the channel is
enabled and there are no channel errors.
Differential operation – The difference in voltage between a channel’s
positive and negative terminals.
Effective resolution – The number of bits in the channel data word that
do not vary due to noise.
Full-scale error (gain error) – The difference in slope between the
actual and ideal analog transfer functions.
Full-scale range (FSR) – The difference between the maximum and
minimum specified analog values.
Gain drift – The change in full-scale transition voltage measured over
the operating temperature range of the module.
LSB (least significant bit) – The bit that represents the smallest value
within a string of bits. The “weight” of this value is defined as the full-
scale range divided by the resolution.
Maximum differential voltage – The largest voltage difference allowed
between the negative terminal and positive terminal during normal
differential operation.
Module ID code – A unique number associated with each 1746 I/O
module. The code defines for the processor the type of I/O or specialty
module residing in a specific slot in the 1746 chassis.
Module update time – See channel update time.

vi SLC 500
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Isolated Analog Output Modules
Overall accuracy – The worst-case deviation of the signal over the full
range, expressed in percent of full scale.
Rack – Ahardware assembly that houses devices such as I/O modules,
adapter modules, processor modules, and power supplies.
Repeatability – The closeness of agreement among repeated
measurements of the same variable under the same conditions.
Resolution – The smallest detectable change in a measurement, typically
expressed in engineering units (e.g. 0.15 °C) or as a number of bits. For
example, a 12-bit system has 4096 possible output states. It can therefore
measure 1 part in 4096. See also effective resolution.
Safe state – The state of the analog outputs entered when the processor is
not in RUN mode. The user must ensure that this state is a safe state for
the application.
Status word – Contains status information about the channel’s current
configuration and operational state. You can use this information in your
ladder program to determine whether the channel data word is valid.
Step response time – The time required for the output signal to reach
95% of its expected, final value, given a full-scale step change in the
output data word.
Useful resolution – See effective resolution.

Overview And Specifications
The 1746sc-INO4i provides four isolated channels of current outputs,
while the 1746sc-INO4vi provides four isolated channels of current or
voltage outputs (in any combination). In both modules, the voltage and/or
current ranges are independently configurable for each channel. These
modules also provide new, advanced features to make your control
systems more dependable and flexible.
Read this chapter to familiarize yourself further with your isolated analog
module (shown above). This chapter covers:
• general features and benefits
• detailed specifications
General Features And
Benefits
Increased System Accuracy and Reliability
Both modules provide 750 Vdc channel-to-channel isolation, which
means no electrical noise crosstalk between channels (resulting in a high
usable resolution). They also provide 750 Vdc field-wiring-to-backplane
isolation to protect the processor and rack. These modules even feature
onboard temperature compensation to maintain their accuracy with
fluctuating ambient temperatures, which is important for crowded control
cabinets.
Reduced System Costs
Because isolation is built into these modules, you can improve system
accuracy while saving hundreds of dollars on system installation costs.
Expensive, external isolation blocks are simply not required. They also
Chapter 1

2SLC 500
™
Isolated Analog Output Modules
provide a single-slot solution for applications requiring up to four, mixed
analog outputs, so you don’t have to buy more I/O than you need.
State-of-the-Art Performance
These modules incorporate proprietary Allen-Bradley technology, so they
operate and perform like the latest Allen-Bradley products. They also
provide 16-bits of resolution, user-programmable range settings,
continuous temperature compensation (no field calibration), software
configuration, programmable output limits, and programmable safe states
in case of a fault.
Detailed Specifications
Table 2. Electrical specifications—module
Backplane Current Consumption (maximum)
1746sc-INO4i 120 mA @ 5 Vdc
250 mA @ 24 Vdc
1746sc-INO4vi 120 mA @ 5 Vdc
250 mA @ 24 Vdc
Backplane Power Consumption (typical) 0.6 W
Number Of Channels 4 (differential, individually isolated)
I/O Chassis Location Any 1746 I/O module slot except slot 0
A/D Conversion Method Sigma-Delta
Calibration Factory calibrated
Temperature compensation once a minute
Opto-Electrical Isolation 750 Vdc channel-to-channel
750 Vdc field wiring-to-backplane
Module ID Code
1746sc-INO4i 3521
1746sc-INO4vi 3519
Thermal Dissipation 4.5 W maximum

Chapter 1: Overview And Specifications 3
Table 3. Electrical specifications—outputs
Output Current Ranges
(selectable for each channel) 4 to 20 mA
0 to 20 mA
0 to 21 mA
OutputVoltage Ranges—INO4vi only
(selectable for each channel) -10 to +10 Vdc
0 to 10 Vdc
0 to 5 Vdc
1 to 5 Vdc
SLC Communication Formats
(selectable for each channel) Scaled engineering units
Scaled for PID
Proportional counts
1746-NO4 format
User-defined scale
Output Impedance
Current Outputs Greater than 1 MΩ
Voltage Outputs—INO4vi only Less than 1.0 Ω
Load Range
Current Outputs 0 to 500 Ω
Voltage Outputs—INO4vi only 1 kΩand greater
Max. Current, Voltage Mode—INI4vi only 10 mA
Output Step Response Time 1 ms (0–95% of full scale)
Channel Update Time (maximum) 33.7 ms for all 4 channels in parallel
Output Resolution 16-bit
Current Outputs 366 nA/count
Voltage Outputs—INO4vi only 320 µV/count
Overall Accuracy
Current Outputs 0.08% of full scale @ 25 °C
0.15% of full scale @ 60 °C
Voltage Outputs—INO4vi only 0.08% of full scale @ 25 °C
0.35% of full scale @ 60 °C
Table 4. Physical specifications
LED Indicators Four green channel status indicators, one for each channel
One green module status indicator
Recommended Cable Belden 8761 (shielded, twisted-pair) or equivalent
Wire Size (maximum) One 12–24 AWG wire per terminal
Terminal Block Removable (supplied)

4SLC 500
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Isolated Analog Output Modules
Table 5. Environmental specifications
Operating Temperature 0 to 60 °C (32 to 140 °F)
Storage Temperature -40 to 85 °C (-40 to 185 °F)
Relative Humidity 5 to 95% non-condensing
Certifications UL/CUL and CE
Hazardous Environment Classifications Class I Division 2 Groups ABCD

Installing And Wiring Your Module
Read this chapter to install and wire your module. This chapter covers:
• avoiding electrostatic damage
• determining power requirements
• setting the DIP switch
• selecting a rack slot
• inserting your module into the rack
• wiring your module
Note that although your module has a jumper on its printed circuit board,
this jumper is for the manufacturer’s use only. Also, your module was
calibrated by the manufacturer, so you don’t need to perform this task.
Important - For UL and CUL compliance, power and input/output (I/O)
wiring must be in accordance with Class I, Division 2, wiring methods
[Article 501-4 (b) of the National Electrical Code , NFPA 70] and in
accordance with the authority having jurisdiction. Also, you must observe
the warnings shown below. Failure to observe these warnings can cause
personal injury.
WARNING
EXPLOSION HAZARD
Substitution of components may impair suitability for
Class I, Division 2;
When in hazardous locations, turn off power before
replacing or wiring modules;
Do not disconnect equipment unless power has been
switched off or the area is known to be non-hazardous.
Chapter 2
!

6SLC 500
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Isolated Analog Output Modules
The following documents contain information that may help you as you
install and wire your module:
•National Electrical Code, published by the National Fire Protection
Association of Boston, MA
• IEEE Standard 518-1977, Guide for the Installation of Electrical
Equipment to Minimize Electrical Noise Inputs to Controllers from
External Sources
• IEEE Standard 142-1982, Recommended Practices for Grounding of
Industrial and Commercial Power Systems
•Noise Reduction Techniques in Electronic Systems, by Henry W. Ott;
published by Wiley-Interscience of New York in 1976
Avoiding Electrostatic
Damage
Guard against electrostatic damage by observing the following
precautions:
CAUTION
ELECTROSTATICALLY SENSITIVE COMPONENTS
• Before handling the module, touch a grounded object to
rid yourself of electrostatic charge.
• When handling the module, wear an approved wrist strap
grounding device.
• Handle the module from the front, away from the
backplane connector. Do not touch backplane
connector pins.
• Keep the module in its static-shield container when not
in use or during shipment.
Failure to observe these precautions can degrade the module’s
performance or cause permanent damage.
Determining Power
Requirements
The backplane of the SLC 500 system can provide both 5 Vdc and 24
Vdc power. The following table shows the maximum current consumed
by your module when using these power sources:
!

Chapter 2: Installing And WiringYour Module 7
Table 6. Backplane current consumed
24Vdc *
Catalog Number 5Vdc w/o ext. supply w/ ext. supply
1746-sc-INO4i 120 mA 250 mA 0 mA
1746sc-INO4vi 120 mA 250 mA 0 mA
* The 1746sc-INO4i and 1746sc-INO4vi output modules can use an external 24 Vdc power
supply to reduce backplane loading.To use an external 24 Vdc power supply, you must set
your module’s DIP switch as indicated in the following subsection.
Use Table 6 to calculate the total load on the system power supply. For
more information, see the Allen-Bradley system Installation and
Operation Manual.
SettingThe DIP Switch
The 1746sc-INO4i and 1746sc-INO4vi output modules have an external
24 Vdc power switch, SW1, giving you the option of using an external
power supply:
• With the switch in the RACK position, the module draws all its power
from the backplane of the SLC system.
• With the switch in the EXT position, the module draws its 24 Vdc
power from an external power source; however, the module still draws
its 5 Vdc power from the backplane.
The switch, SW1, is located in the bottom corner of the module’s large
circuit board.
1
RACK
EXT
SW1

8SLC 500
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Isolated Analog Output Modules
Selecting A Rack Slot
Two factors determine where you should install your module in the rack:
ambient temperature and electrical noise. When selecting a slot for your
module, try to position your module:
• in a rack close to the bottom of the enclosure (where the air is cooler)
• away from modules that generate significant heat, such as 32-point
input/output modules
• in a slot away from ac or high-voltage dc modules, hard contact
switches, relays, and ac motor drives
• away from the rack power supply (if using a modular system)
Remember that in a modular system, the processor always occupies the
first slot of the rack.
InsertingYour Module
IntoThe Rack
CAUTION
POSSIBLE EQUIPMENT OPERATION
Before installing or removing your module, always
disconnect power from the SLC 500 system and from any
other source to the module (in other words, don’t“hot
swap”your module), and disconnect any devices wired to
the module.
Failure to observe this precaution can cause unintended
equipment operation and damage.
When inserting your module into the rack, you do not need to remove the
supplied 16-position terminal block from the module. If, however, you do
remove the terminal block, apply the supplied write-on label to the
terminal block, and use the write-on label to identify your module’s
location.
To remove the terminal block, unscrew the two retaining screws at the
top and bottom of the terminal block, and using a screwdriver or needle-
nose pliers, carefully pry the terminal block loose.
!

Chapter 2: Installing And WiringYour Module 9
To insert your module into the rack, follow these steps:
1. Align the circuit board of your module with the card guides at the top
and bottom of the chassis.
2. Slide your module into the chassis until both top and bottom retaining
clips are secure. Apply firm even pressure on your module to attach it
to its backplane connector. Never force your module into the slot.
Cover all unused slots with the Card Slot Filler, Allen-Bradley part
number 1746-N2.
To remove your module, press the retaining clips at the top and bottom of
your module and slide it out.

10 SLC 500
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Isolated Analog Output Modules
WiringYour Module
To wire the terminal block, you need:
• a small, flat-blade screwdriver
• Belden 8761 (shielded, twisted pair) cable or equivalent
CAUTION
POSSIBLE EQUIPMENT OPERATION
Before wiring your module, always disconnect power from
the SLC 500 system and from any other source to the
module.
Failure to observe this precaution can cause unintended
equipment operation and damage.
Before wiring the terminal block, take some time to plan your system:
• Ensure that the SLC 500 system is installed in a NEMA-rated
enclosure and that the SLC 500 system is properly grounded.
• Ensure that the load resistance for a current output channel is less than
500 Ω.
• Ensure that the load resistance for a voltage output channel is greater
than 1 kΩ.
• Route the field wiring away from any other wiring and as far as
possible from sources of electrical noise, such as motors, transformers,
contactors, and ac devices. As a general rule, allow at lease 6 in.
(about 15.2 cm) of separation for every 120 V of power.
• Routing the field wiring in grounded a conduit can reduce electrical
noise further.
• If the field wiring must cross ac or power cables, ensure that they
cross at right angles.
To wire your module, follow these steps:
1 Determine the length of cable you need to connect a channel to its
field device. Remember to include additional cable to route the drain
wire and foil shield to their ground points.
2. At each end of the cable, strip some casing to expose the individual
wires.
3. Trim the exposed signal wires to 2 in. lengths. Strip about 3/16 in.
(about 5 mm) of insulation away to expose the end of each wire.
!