Triconex 3700 / 3700A Analog Input Module

Overview

The Triple Modular Redundant (TMR) Triconex 3700A and Triconex 3700 Analog Input (AI) Module provides accurate and fault-tolerant data acquisition through independent input channels, mid-value selection, and comprehensive diagnostics for high-reliability systems.

Features

Channel Independence:
Three independent channels per input point, preventing single-channel failures from affecting others.
Data Handling:
- Converts variable voltage signals to digital values for processing by three main processors.
- In TMR mode, mid-value selection ensures correct data for every scan.
Diagnostics:
Continuous monitoring of each channel activates the Fault indicator if any failure is detected. The module remains operational with up to two faulty channels.
Hot-Spare Capability:
Supports online replacement of faulty modules without system interruption.
External Termination Panel (ETP):
Requires a separate ETP connected via cable to the Tricon backplane.

Specifications

Feature	Specification
Model Number	3700 / 3700A
Voltage	0-5 V, ±6% (3700A only)
Type	TMR
Number of Input Points	32, differential, DC coupled
Isolated Points	No
Input Update Rate	55 ms
Resolution	12 bits
Accuracy	<0.15% of FSR, from 0°C to 60°C
Input Resistance (Load)	30 MΩ (DC), minimum
Power-Off Resistance	30 KΩ (DC), typical
Common Mode Rejection	-80 dB (DC-100 Hz), typical
Common Mode Range	-12 V to +12 V peak
Leg-to-Leg Isolation	200 KΩ, typical
Normal Mode Rejection	– @ 8 Hz: -3 dB
	– @ 60 Hz: -17 dB
	– @ 120 Hz: -23 dB
Input Overrange Protection	150 VDC / 115 VAC continuous
Current Range	0-20 mA, 250 Ω shunt
Diagnostic Indicators	– Module Status: PASS, FAULT, ACTIVE
	– Color Code: Yellow