Standard Analog Current
Input Modules
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2011 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
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1
DATA SHEET
Form 443-111026
Standard Analog Current Input Modules
Features
Single channel of optically-isolated current-to-digital
conversion
AD3T and AD2T modules offer additional channel-to-
channel isolation
“T” modules provide 4,000 Vrms channel-to-channel
isolation which eliminates any loop problems
Description
Each Opto 22 AD3, AD3T, and AD2T analog input module
provides a single channel of optically-isolated current-to-
digital conversion. The AD3T and AD2T modules offer
additional channel-to-channel isolation. For the AD3 and
AD3T modules, the nominal input range is 4 to 20 mA with an
under/over range capability from less than 3 mA to greater
than 35 mA. The AD2T module has a nominal input range of 0
to 20 mA with an under/over range capability from less than -
1.25 mA to greater than 35 mA. The “T” modules also provide
4,000 Vrms channel-to-channel isolation which eliminates any
loop problems. These modules plug into a Classic Standard
analog I/O rack and are secured by a captive screw.
Part Numbers
Part Description
AD3 4 to 20 mA Input
AD3T 4 to 20 mA Input Isolated
AD2T 0 to 20 mA Input Isolated
AD3T
Standard Analog Current Input Modules
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2011 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
Standard Analog Current Input Modules
PAGE
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DATA SHEET
Form 443-111026
Specifications
AD3 AD3T AD2T
Input Impedance 249 Ohms 249 Ohms 50 Ohms
Nominal Input Range 4 to 20 mA 4 to 20 mA 0 to 20 mA
Over/under Range 3 to 35 mA 3 to 35 mA -1.25 to 35 mA
Accuracy 0.016 mA (0.1% of span) 0.016 mA (0.1% of span) 0.020 mA (0.1% of span)
Resolution 12 bits (0.0039 mA) 12 bits (0.0039 mA) 12 bits (0.0049 mA)
Response Time Full-scale step change in 3 ms
Isolation Transient
Input-to-Output
Input-to-Analog-Supply 4,000 Vrms
n/a 4,000 Vrms
4,000 Vrms 4,000 Vrms
4,000 Vrms
Power Requirements 13 mA at +15 (+/- 0.25) VDC
7.5 mA at -15 (+/- 0.25) VDC 35 mA at +15 (+/- 0.25) VDC
35 mA at -15 (+/- 0.25) VDC 35 mA at +15 (+/- 0.25) VDC
35 mA at -15 (+/- 0.25) VDC
Ambient Temperature:
Operating
Storage 0 to 70 °C
- 25 to 85 °C
*Accuracy figures assume use of Gain and Offset commands.
Standard Analog Current Input Modules
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2011 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
Standard Analog Current Input Modules DATA SHEET
Form 443-111026
PAGE
3
Connections
AD3 Modules Using Shared Loop Service
AD3T: All of the lower A terminals on the
mounting rack are tied together. These
provide a convenient tie point for shared
loop source return. To use the AD3T
module with a common loop power
supply, connect any one lower A terminal
to the shared loop source “-”, then jumper
upper A to lower A for each AD3T.
NOTE: For connecting the AD2T
module, use AD3T module
diagrams and instructions.
AD3 Modules Using Self-powered Transmitter
NOTE: For connecting the AD2T
module, use AD3T module
diagrams and instructions.
Standard Analog Current Input Modules
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2011 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
Standard Analog Current Input Modules
PAGE
4
DATA SHEET
Form 443-111026
Connections (cont)
NOTE: For connecting the AD2T
module, use AD3T module
diagrams and instructions.
NOTE: For connecting the AD2T
module, use AD3T module
diagrams and instructions.
Standard Analog Current Input Modules
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2011 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
Standard Analog Current Input Modules DATA SHEET
Form 443-111026
PAGE
5
Connections, Loop Supply
Standard Analog Current Input Modules
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2011 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
Standard Analog Current Input Modules
PAGE
6
DATA SHEET
Form 443-111026
Connections, Loop Supply (cont.)
NOTE: For connecting the AD2T
module, use AD3T module
diagrams and instructions.
Standard Analog Current Input Modules
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2011 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
Standard Analog Current Input Modules DATA SHEET
Form 443-111026
PAGE
7
Connections, Loop Supply (cont.)
NOTE: For connecting the AD2T
module, use AD3T module
diagrams and instructions.
Standard Analog Current Input Modules
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2011 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
Standard Analog Current Input Modules
PAGE
8
DATA SHEET
Form 443-111026
Schematics
ANALOG MOUNTING RACK SCHEMATIC
(PB4AH, PB8AH, PB16AH)
More About Opto 22
www.opto22.com • Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • Form 1335-110907
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2011 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
Products
Opto 22 develops and manufactures reliable, flexible, easy-to-
use hardware and software products for industrial automation,
energy management, remote monitoring, and data
acquisition applications.
OptoEMU Energy Management System
The easy-to-use OptoEMU Sensor monitors electrical energy
use in your facility and delivers detailed, real-time data you
can see and analyze. The Sensor can monitor energy data from
pulsing meters, electrical panels or subpanels, and equipment.
View energy data online using a software service or
incorporate the data into your control system for complete
energy management.
SNAP PAC System
Designed to simplify the typically
complex process of selecting and
applying an automation system, the
SNAP PAC System consists of four
integrated components:
•SNAP PAC controllers
•PAC Project™ Software Suite
•SNAP PAC brains
•SNAP I/O™
SNAP PAC Controllers
Programmable automation controllers (PACs) are
multifunctional, modular controllers based on open standards.
Opto 22 has been manufacturing PACs for over two decades.
The standalone SNAP PAC S-series and the rack-mounted
SNAP PAC R-series both handle a wide range of digital, analog,
and serial functions for data collection, remote monitoring,
process control, and discrete and hybrid manufacturing.
SNAP PACs are based on open Ethernet and Internet Protocol
(IP) standards, so you can build or extend a system easily,
without the expense and limitations of proprietary networks
and protocols.
PAC Project Software Suite
Opto 22’s PAC Project Software Suite provides full-featured,
cost-effective control programming, HMI (human machine
interface) development and runtime, OPC server, and
database connectivity software for your SNAP PAC System.
Control programming includes both easy-to-learn flowcharts
and optional scripting. Commands are in plain English;
variables and I/O point names are fully descriptive.
PAC Project Basic offers control and HMI tools and is free for
download on our website, www.opto22.com. PAC Project
Professional, available for separate purchase, adds
OptoOPCServer, OptoDataLink, options for controller
redundancy or segmented networking, and support for legacy
Opto 22 serial mistic™ I/O units.
SNAP PAC Brains
While SNAP PAC controllers provide central control and data
distribution, SNAP PAC brains provide distributed intelligence
for I/O processing and communications. Brains offer analog,
digital, and serial functions, including thermocouple
linearization; PID loop control; and optional high-speed digital
counting (up to 20 kHz), quadrature counting, TPO, and pulse
generation and measurement.
SNAP I/O
I/O provides the local connection to sensors and equipment.
Opto 22 SNAP I/O offers 1 to 32 points of reliable I/O per
module, depending on the type of module and your needs.
Analog, digital, and serial modules are all mixed on the
same mounting rack and controlled by the same processor
(SNAP PAC brain or rack-mounted controller).
Quality
Founded in 1974, Opto 22 has established a
worldwide reputation for high-quality products. All
are made in the U.S.A. at our manufacturing
facility in Temecula, California. Because we do
no statistical testing and each part is tested
twice before leaving our factory, we can
guarantee most solid-state relays and optically
isolated I/O modules for life.
Free Product Support
Opto 22’s California-based Product Support Group offers free,
comprehensive technical support for Opto 22 products. Our
staff of support engineers represents decades of training and
experience. Support is available in English and Spanish by
phone or email, Monday–Friday, 7 a.m. to 5 p.m. PST.
Additional support is always available on our website: how-to
videos, OptoKnowledgeBase, self-training guide,
troubleshooting and user’s guides, and OptoForums.
In addition, hands-on training is available for free at our
Temecula, California headquarters, and you can register online.
Purchasing Opto 22 Products
Opto 22 products are sold directly and through a worldwide
network of distributors, partners, and system integrators. For
more information, contact Opto 22 headquarters at 800-321-
6786 or 951-695-3000, or visit our website at
www.opto22.com.
www.opto22.com
