Triconex 2352 32-Ch Analog Input 4-20mA TMR

Product Overview

The 2352 is a 32-channel analog input module manufactured by Invensys Triconex for the Tricon safety instrumented system. It converts 4–20 mA DC current signals from field transmitters into digital values with 12-bit resolution and 0.15% full-scale accuracy. Designed with TMR architecture, each of the 32 commoned input channels is processed by three independent hardware paths, ensuring reliable data acquisition for safety-critical process variables such as pressure, temperature, flow, and level.

Key Specifications

• System: Invensys Triconex Tricon SIS
• Type: TMR Analog Input Module
• Channels: 32, commoned
• Nominal Input Current: 4–20 mA DC
• Operational Current Range: 2–22 mA DC
• Absolute Maximum Input Current: 50 mA DC
• Resolution: 12 bits
• Absolute Error: 0.15% of full scale (20 mA)
• Input Impedance (with Baseplate): 250 Ω
• Source Impedance: 180 Ω
• Input Bandwidth (3 dB): 16 Hz
• Scan Time: < 1 ms for all 32 points
• Functional-to-Protective-Earth Isolation: 500 VDC minimum
• Functional-to-Functional-Earth Isolation: 800 VDC minimum

Features & Benefits

1. TMR Signal Integrity: Three independent input channels per point with mid-value selection eliminate erroneous readings from single-channel failures.
2. High-Speed Scanning: Sub-millisecond scan time for all 32 points supports rapid safety logic execution for emergency shutdown systems.
3. Precision Current Measurement: 0.15% accuracy and 12-bit resolution provide tight-tolerance control for critical process loops.
4. Built-In Diagnostics: Force-to-value diagnostic (FVD) capability enables online verification of input channel health without process disruption.
5. Overcurrent Protection: 50 mA absolute maximum input current protects internal circuitry from wiring faults and transmitter failures.

FAQ

Q: What is the difference between 2352 and 2351?
A: The 2352 is a 32-channel 4–20 mA analog input module. The 2351 is a 16-channel variant with similar signal conditioning. Both use TMR architecture.

Q: Does the 2352 provide loop power for 2-wire transmitters?
A> The module provides loop power for 2-wire 4–20 mA transmitters through the 250 Ω I-to-V resistor network. Verify total loop current against the module's power budget.

Q: Can the 2352 handle 0–20 mA signals?
A> The operational range is 2–22 mA, which covers both 4–20 mA and 0–20 mA signals. For 0–20 mA, the digital scaling is adjusted in TriStation 1131.

Installation Guide

• Install the module into a Tricon analog input slot in the chassis.
• Connect 2-wire or 4-wire transmitters to the external termination panel (ETP) terminals.
• Verify polarity on all current loop connections before energizing.
• Ground shielded cable drains at one end only (ETP ground bus) to prevent ground loops.
• Verify input accuracy by injecting a 4 mA, 12 mA, and 20 mA calibrated current source and comparing module readings.

Selection Tips

• Channel Count: The 2352 provides 32 channels. For 16-channel requirements, the 2351 offers a lower-density alternative.
• Signal Type: The 2352 is dedicated to 4–20 mA current inputs. For voltage inputs (0–5V, 0–10V), select the 3704E or 3700A.
• Isolation Needs: The 2352 is a commoned-input module. For channel-to-channel isolation, specify the 3703E isolated analog input module.