3703E Invensys Triconex Isolated Analog Input Module

Analog Input Modules Overview

Introduction Analog Input (AI) Modules consist of three independent input channels. Each channel receives variable voltage signals, converts them to digital values, and transmits these values to the three Main Processor modules upon request. In Triple Modular Redundancy (TMR) mode, a mid-value selection algorithm ensures correct data for every scan. Each input point is sensed in a way that prevents a single channel failure from affecting other channels. Ongoing diagnostics for each channel detect failures, activating the module's Fault indicator and the chassis alarm signal. The Fault indicator signals a channel fault, not a module failure, allowing the module to operate with up to two faulty channels. AI Modules support hot-spare capability for online replacement of faulty modules. They require an external termination panel (ETP) and are mechanically keyed for proper installation in a Tricon chassis.

Module Specifications Model Numbers: 3703E

Voltage:

• 3703E: 0-5V or 0-10V, + 6% (selectable using TriStation 1131)

Type: TMR, AI

Number of Input Points:

• 3703E: 16, differential, isolated

Isolated Points:

• 3703E: Yes

Input Update Rate:

• 3703E: 50 ms

Resolution: 12 bits

Accuracy: < .15% of Full Scale Range (FSR), from 0° to 60°C

Input Resistance (load): 30 MΩ (DC), minimum

Power-Off Resistance:

• 3703E: 30 MΩ (DC), minimum

Common Mode Rejection:

• 3703E: -90 dB @ 60Hz, minimum; -100 dB @ DC, minimum

Common Mode Range:

• 3703E: +200V peak

Leg-to-Leg Isolation:

• 3703E: 20 KΩ, typical

Normal Mode Rejection:

• At 8Hz: -3 dB
• At 60Hz: -17 dB
• At 120Hz: -23 dB

Input Overrange Protection: 150 VDC/115 VAC continuous

Current Range:

• 3703E: 0-20 mA, 250 Ω shunt for 5V, 500 Ω shunt for 10V

Diagnostic Indicators: Pass, Fault, Active

Color Code:

• 3703E: Mustard yellow

Conclusion Analog Input Modules are integral components designed for reliability and accuracy, featuring independent input channels, comprehensive diagnostics, and the ability to operate despite channel failures. They are equipped with various safety and operational features, making them suitable for critical applications.