Description
Note: Many products are not yet listed. Please contact us for more product information. Our supply channels are constantly expanding, and we currently have 20 stable shared supply channels. Please confirm the model, product, price, and all other necessary information with customer service before placing an order. We offer new, refurbished, and used products, and prices are adjusted according to the year of the item you require.
3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Model | 3720 |
| Product Type | TMR Analog Input Module |
| Number of Channels | 64, single-ended |
| Input Voltage Range | 0 to 5 VDC (+6% over-range to 5.3 V) |
| Input Current Range | 0 to 20 mA (with 250 Ω shunt) |
| Resolution | 12-bit or 14-bit (programmable) |
| Accuracy | < 0.15% of FSR (0 °C to 60 °C) |
| Update Rate | 10 ms |
| Input Resistance (load) | 10 MΩ minimum (DC) |
| System Compatibility | Tricon v10.2 and later |
| Color Code | Yellow |
| Architecture | Triple Modular Redundant (TMR) |
4. Product Introduction (Anti-Template)
The Triconex 3720 is a high-density TMR Analog Input module for the Tricon safety system (version 10.2 and later). It provides 64 single-ended channels that accept 0–5 VDC signals or 0–20 mA current signals (using external 250 Ω shunt resistors).
Each input is processed independently by the three legs of the TMR architecture, with the Main Processors voting on the results to maintain high integrity. The module supports programmable 12-bit or 14-bit resolution and delivers an update rate of 10 ms. Accuracy is better than 0.15% of full-scale range across the operating temperature range. Continuous online diagnostics monitor channel health, and the module can be hot-swapped in a running system. It is commonly used for high-density analog signal acquisition in SIL-rated safety applications such as emergency shutdown, fire & gas, and process protection systems.
Triconex 3720
Triconex 3720
Triconex 3720
Triconex 3720
Triconex 3720
5. QC, Procurement & Logistics SOP
- Inbound Verification – Confirm full model number (3720), revision markings, connector condition, and color code (yellow). Photograph all labels.
- Functional Testing – Install in a compatible Tricon chassis where possible and verify basic channel status and diagnostic indicators. Full verification requires a running TMR system.
- QA & Packaging – Protect the backplane connectors and field terminals, clean the module, and pack in anti-static protective packaging.
- Global Logistics & Export Compliance – Classify under the correct HS code for industrial safety I/O modules. Packaging must protect against electrostatic discharge and mechanical shock; export documentation is prepared to minimize customs delays.
6. Technical Pitfalls & Integration Warnings
System Version – The 3720 is only supported in Tricon v10.2 and later. Installing it in earlier systems will result in incompatibility.
Shunt Resistors – For 4–20 mA or 0–20 mA signals, external 250 Ω precision shunt resistors must be installed correctly. Incorrect or missing shunts produce erroneous readings.
Resolution Setting – Configure 12-bit or 14-bit resolution in TriStation 1131 according to application requirements. Higher resolution reduces noise immunity in some cases.
Hot-Swap Procedure – Follow Triconex hot-swap guidelines strictly. Improper removal or insertion can disrupt the TMR configuration or cause channel faults.
7. Frequently Asked Questions (FAQ)
What is the realistic global lead time for a verified Triconex 3720?
As a specialized safety system module, availability depends on surplus stock. Typical lead time after verification is 5–20 business days plus specialized shipping.
What is the function of the 3720?
It is a 64-channel TMR Analog Input module that accepts 0–5 VDC or 0–20 mA signals for the Tricon safety controller.
How many channels does it have?
64 single-ended analog input channels.
What voltage and current ranges does it support?
0–5 VDC (with 6% over-range) and 0–20 mA (using 250 Ω shunts).
What system versions is it compatible with?
Tricon v10.2 and later systems.
Is the 3720 still in production?
It is a mature Tricon module. Newer platforms use different I/O modules, but the 3720 remains available through surplus channels for existing systems.
What should be confirmed before ordering a replacement?
Exact model number and revision, Tricon system version (must be v10.2 or later), required resolution setting, and whether current or voltage inputs will be used.
