The T3420A of the ICS TRIPLEX Regent series is a high-performance analog input module designed for industrial safety and process control, serving as one of the core components of the Regent safety control system.
The module supports 16 single-ended analog inputs, or can be flexibly configured as 8 differential inputs. It converts field voltage/current signals into digital signals, delivering reliable process data acquisition for Safety Instrumented Systems (SIS), Distributed Control Systems (DCS) and other platforms. It is widely applied in industrial scenarios requiring high reliability, such as petroleum, chemical and power industries.
Technical Parameters
1. Channel Configuration
Single-ended Mode: 16 independent single-ended analog input channels (CH1–CH16).Differential Mode: 8 differential input channels (CH1(+)/CH1(–) to CH8(+)/CH8(–), corresponding to shaded terminal definitions in the label).Reference and Ground Terminals: Provides AREF 1–8, AREF 9–16 reference terminals and AGND analog ground terminals; some terminals are marked N/C (Not Connected).
2. Signal Input Range (Voltage / Current)
The module supports 5 preset signal ranges. Current input requires an external precision 250Ω resistor.
| Configuration No. | Voltage Input Range (Vdc) | Current Input Range (mA) |
|---|---|---|
| 1 | 0 to 5 | 0 to 20 |
| 2 | 1 to 5 | 4 to 20 |
| 3 | -5 to +5 | -20 to +20 |
| 4 | 0 to 10 | 0 to 40 |
| 5 | -10 to +10 | -40 to +40 |
3. Environmental and Operating Parameters
Operating Temperature: 0°C ~ 60°C (32°F ~ 140°F)
Product Identification:Model: T3420APart Number: 200234Serial Number: B904Revision: Rev. B/SBrand Series: ICS TRIPLEX Regent (Trustworthy Control Safety Control Series)
4. Key Features
- Supports 60Hz power frequency interference rejection (standard for base T3420A; T3420AF is the fast-response version).
- Adopts hot-swap / hot-replace design, allowing online maintenance without interrupting system operation.
- High anti-interference design, suitable for complex electromagnetic environments in industrial sites.
Frequently Asked Questions (FAQ)
Q1: Why is an external 250Ω resistor required for current input of the T3420A?A: The module’s current input function is implemented by connecting an external precision resistor. Industrial 4–20mA / 0–20mA current signals flow through the 250Ω resistor and are converted into 1–5V / 0–5V voltage signals, which are then sampled and converted by the module.This design reduces module costs and prevents internal circuitry from directly bearing current loads, improving long-term operational reliability.
Q2: How to choose between single-ended mode and differential mode?A:Single-ended Mode (16 channels): Suitable for applications with low signal interference and short transmission distances. It provides more channels with simpler wiring.Differential Mode (8 channels): Ideal for environments with strong electromagnetic interference and long signal transmission distances. Differential input effectively eliminates common-mode interference and improves signal acquisition accuracy. The shaded terminals on the module label are specifically defined for differential mode wiring.
Q3: Does the T3420A support hot swapping?A: Yes. The module is hot-replaceable and can be directly replaced while the system is running without shutdown. It is well suited for safety-critical applications such as SIS that demand high system continuity.
Q4: What are the limits of the module operating temperature range?A: The standard operating temperature range is 0~60℃. Operating outside this range may degrade signal acquisition accuracy, shorten service life, or even trigger module protection or permanent damage under extreme temperatures. When deployed in high or low-temperature environments, use temperature-controlled cabinet equipment to keep ambient temperature within the rated range.
Q5: What is the difference between T3420A and T3420AF?A: Both are analog input modules of the Regent series. The main differences lie in interference rejection and response speed:T3420A: Equipped with 60Hz power frequency interference suppression, suitable for industrial sites with severe mains interference, with relatively slower response speed.T3420AF: Without power frequency filtering, featuring faster response speed, ideal for applications requiring low acquisition delay and operating in low-interference environments.
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