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Triconex 3721 Differential Analog Input Module
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Detail
- Product NameTriconex 3721 Differential Analog Input Module
- Item NO.3721
- Weight2.0200 kg = 4.4533 lb = 71.2534 oz
- CategoryDCS> Triconex
- BrandSchneider
- Creation Time2026-11-04
- Triconex 3721 differential analog input module. Differential voltage acquisition.Product dimensions: 2.1 × 40.8 × 40 cm
TRICONEX / TRICON
3721
Differential Analog Input Module
Differential voltage acquisition.
Selectable resolution for Tricon input processing.
TRICON
PRODUCT PROFILE
Input points
32 differential
Input voltage ranges
0 to 5 VDC or -5 to +5 VDC; +6% overrange
Input update rate
10 ms
FIELD VOLTAGE / DIGITAL CONVERSION / TMR INPUT DATA
Differential voltage acquisition. Selectable resolution for Tricon input processing.
Contact info
LET’S DISCUSS YOUR REQUIREMENT
Send the model number and required quantity to Jim Pei for product information and a quotation.
Specifications
| Parameter | Specification |
|---|---|
| Input points | 32 differential |
| Input voltage ranges | 0 to 5 VDC or -5 to +5 VDC; +6% overrange |
| Input update rate | 10 ms |
| Resolution | 12 or 14 bits, programmable |
| Accuracy | <0.15% of FSR, 0 to 60 °C |
| Input resistance | 10 MΩ minimum, DC |
| Power-off resistance | 140 kΩ typical, DC |
| Common-mode rejection | -85 dB, DC to 100 Hz |
| Common-mode range | -12 to +12 V peak |
| Leg-to-leg isolation | 420 kΩ typical |
| Normal-mode rejection at 23 Hz | -3 dB |
| Normal-mode rejection at 60 Hz | -8 dB |
| Normal-mode rejection at 120 Hz | -14 dB |
| Continuous input overrange protection | 150 VDC / 115 VAC |
| Current-input conversion | 0-20 mA with a 250 Ω shunt resistor |
| Input coupling | DC-coupled |
| Channel-to-channel isolation | Not isolated |
| Input architecture | Triple modular redundant (TMR) |
The voltage range and resolution are selected in TriStation 1131. Check the field termination and shunt arrangement before changing between voltage and current-loop inputs.
Description
DIFFERENTIAL ANALOG INPUT MODULE
Tricon
Triconex 3721 is a differential analog input module with thirty-two input points for the Tricon system. It accepts a unipolar or bipolar voltage range and offers programmable conversion resolution. Independent input channels acquire the field signals and deliver converted values to the main processors. Mid-value selection in TMR operation supports consistent process data despite a channel fault. Continuous channel diagnostics provide fault indication through the module and chassis. The module integrates through a separate external termination panel and its backplane interface cable.
Signal Processing & Diagnostics
01 / Differential acquisition
The input arrangement measures the difference between the signal connections, supporting the configured unipolar or bipolar voltage input range.
02 / Selectable conversion
The project can select the input range and conversion resolution to match the signal requirements of the installed process instrumentation.
03 / Triplicated supervision
Independent input paths are checked continuously; a failed diagnostic reports a channel fault and raises the chassis alarm.
Applications & Integration
Bipolar process measurements
Use the bipolar range where a field signal crosses the zero reference; retain the correct signal polarity and common-mode limits.
Current transmitter interfaces
A specified shunt converts a current loop to an input voltage. Select the termination arrangement for the intended conversion and installed wiring.
Maintain the configured input range
A replacement must preserve the project input scaling and wiring reference. Differential inputs do not imply channel-to-channel galvanic isolation.
About Company
Years of Global Experience
With 20+ years of industry experience, we serve customers worldwide and have built long-term relationships across the UK, Russia, UAE, India, Venezuela, and more.
Professional Support Team
Our experienced team provides reliable pre-sales and after-sales support, helping customers select suitable products and resolve purchasing concerns.
Wide Range of Brands
We supply leading automation brands covering PLCs, DCS, I/O modules, drives, motors, power supplies, communication modules, and more.
Large In-Stock Inventory
A wide range of products is available from stock, including discontinued, obsolete, and hard-to-find parts, helping reduce sourcing time.
Honesty & Trust
We value long-term cooperation and treat every customer with honesty, respect, responsibility, and care.
Your Trusted Automation Partner
From a single replacement part to complete automation projects, we are ready to support your needs and build a long-term partnership.
Our Company History
The Beginning
Company was founded in Xiamen, Fujian, China, in 2005 with a team of only four people. At that time, we mainly served selected European and North American markets, supplying commonly requested industrial automation products from Siemens, Allen-Bradley and Bently Nevada. Although the business was still developing and we completed relatively few orders, this period helped us build essential product knowledge and international trade experience.
A Period of Growth
By 2017, our team had grown to approximately 30 people, and we had established a warehouse for in-stock automation components. Our business expanded across Europe, North America and Southeast Asia, while our product range grew from popular models to scarce and discontinued industrial automation parts. As our product knowledge and service experience increased, we completed nearly 20 orders per month on average.
Serving Customers Worldwide
Today, Company serves customers worldwide with a professional team of approximately 60 people. Our warehouse holds a broad selection of industrial automation components, including popular products, hard-to-find parts and discontinued models. We now complete more than 30 orders per month, with an average monthly transaction value of approximately USD 3 million. We have established long-term partnerships with nearly 30 customers from different countries and welcomed almost 40 international customers to visit our company.
Since our company was founded, we have served every customer with sincerity and professionalism. Our prices may not always be the lowest, but we earn long-term trust through quality products, dependable after-sales support, honest condition reporting, timely communication and responsible delivery. Our goal is to build lasting partnerships rather than pursue one-off transactions.
Product brand
► DCS System: Distributed Control System (DCS) ◄
ABB | Invensys Foxboro | Invensys Triconex | Ovation | Woodword | HIMA | Yokogawa | Honeywell | Emerson
► PLC System: Programmable Logic Controller (PLC) ◄
Rockwell Allen-Bradley | Schneider Modicon | GE Fnauc | Siemens | Prosoft | Bachmann | Woodhead
► TSI System ◄
Bently Nevada | EPRO | ENTEK
Other Products
| EDS4100 | HB276HD4 | X-18s |
| 800HL-PPD24G | EC30 | N-ID8 |
| 220W000042-402 | XLS757-7A-T | SATELLINE-3ASD |
| MNB-CNTLR-300 | XY2CE2A296 | ZA10341 |
| GX1230 | EHS-220 | QUINT-PS/24DC/24dc/20/CO |
| 80PK-27 | UC24PGR | 700-HN125 |
| MMC-120A-F000 | AT-MC103XL | PDITE-SMRTVUE-01 |
| 396381-01-3 | EY-RC302F001 | PLC-XP55 |
| f170 | QPA2000 | GC1600CH |
| PZM-760-24-B | 8265674 | 601P-M |
| MTWP-2475W-FR | 1492-FB3C30 | R643-16 |
| F9342LP-05 | 63-10610729-000 | BP3-1V11B5C111 |
| LIF-200 | 126648-01 | ULFIM16AI-D37M-45-XOR-R2 |
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