Product Details
The Invensys Triconex 3720 is a high-density, single-ended analog input module engineered for safety-critical and high-integrity control applications. Featuring 64 isolated single-ended channels, this module accepts both voltage (0-5 VDC) and current (0-20 mA) inputs, offering programmable 12-bit or 14-bit resolution and a rapid channel update rate of 10 ms.
Signal Conditioning and Performance
The module supports a 0-5 VDC input voltage range and a 0-20 mA current range when utilized with external 250 ohm shunt resistors, both providing a +6% overrange margin. It achieves an accuracy of < 0.15% of full scale range across operating temperatures from 0 deg C to 60 deg C. Advanced filtering provides normal mode noise rejection (-3 dB @ 8 Hz, -17 dB @ 60 Hz, -23 dB @ 120 Hz) to maintain high signal fidelity in noisy industrial environments.
Channel Isolation and Protection
Each channel is galvanically isolated to prevent earth loops and protect system electronics from field disturbance. Built-in input overrange protection guards internal components against voltage spikes, while a continuous common mode voltage tolerance of 150 VDC / 115 VAC ensures steady operation under adverse electrical conditions.
Specifications
| Parameter | Specification |
|---|---|
| Model | 3720 |
| Brand | Invensys (Triconex) |
| Product Type | Analog Input Module |
| Input Structure | 64 channels, single-ended |
| Isolation | Yes |
| Input Voltage Range | 0-5 VDC (+6% overrange) |
| Input Current Range | 0-20 mA (+6% overrange) with 250 ohm shunt resistor |
| Resolution | 12 bits or 14 bits (programmable) |
| Update Rate | 10 ms |
| Accuracy | < 0.15% of FSR (0 deg C to 60 deg C) |
| Input Resistance (Load) | 10 Mohm min (DC) |
| Power-Off Resistance | 140 kohm typical (DC) |
| Leg-to-Leg Isolation | 420 kohm typical |
| Common Mode Range | 150 VDC / 115 VAC continuous |
| Normal Mode Rejection | -3 dB @ 8 Hz, -17 dB @ 60 Hz, -23 dB @ 120 Hz |
| Overrange Protection | Built-in |
Frequently Asked Questions
Q: How does the Triconex 3720 module accommodate 0-20 mA current loops?
A: The module measures 0-20 mA current signals by using external 250 ohm shunt resistors to convert the current into an equivalent voltage signal.
Q: Can the conversion resolution of the 3720 analog input module be adjusted?
A: Yes, the module features programmable resolution, allowing configuration for either 12 bits or 14 bits depending on system application requirements.
Q: What is the channel update rate for the 64 input points on the 3720?
A: The module updates all 64 isolated single-ended channels every 10 ms.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
Mastering Wire Identification in Industrial Automation: The Power of Ferrules and Cross-Ferruling
Proper wire labeling forms the cornerstone of reliable control system installation and long-term maintenance. In complex industrial automation environments, technicians terminate thousands of conductor ends inside control panels, marshalling racks, and field junction boxes. Ferrules serve as individual tube-shaped sleeve markers slipped onto conductors before final termination. While technicians historically relied on pre-printed individual letter rings, modern control panel builders utilize automated ferrule printing machines. These thermal-transfer printers generate durable, single-sleeve heat-shrink tags directly matching approved wiring schematics, significantly accelerating cabinet assembly workflows.
Understanding Marshalling Cabinets in Industrial Automation and Control Systems
Marshalling cabinets serve as the crucial connection hub between field instruments and centralized processing units. In large DCS and PLC control system architectures, hundreds of multipair field cables run from local junction boxes to the central instrument equipment room. The marshalling cabinet houses field terminal blocks, surge arresters, intrinsic safety isolation barriers, and interposing relays. By segregating field field-wiring terminations from sensitive processor hardware, engineers protect expensive controller backplanes from high-voltage transients. Consequently, this modular separation dramatically streamlines maintenance workflows and simplifies system expansion.
Essential Best Practices for PLC Wiring and Installation in Industrial Automation
Successful control system deployment begins with thoroughly reviewing manufacturer technical documentation. Controllers from major brands like Allen-Bradley, Siemens, and Schneider Electric feature unique terminal layouts. Engineers must verify voltage requirements before connecting power cables to prevent catastrophic equipment damage. Standard line connections require strict adherence to regional electrical codes and proper wire color coding. Furthermore, panel builders should always establish a robust low-impedance ground connection using at least 16-AWG copper conductor tied directly to the main plant grounding grid.