TRICONEX 3721 | Differential Analog Input Module

📝 Product Description

The TRICONEX 3721 is a TMR Differential Analog Input Module designed for Tricon safety and process-control systems. It provides 32 differential, DC-coupled analog input channels and supports 0 to 5 VDC or −5 to +5 VDC signals. The module uses programmable 12-bit or 14-bit resolution and has a 10 ms input update rate, making it suitable for monitoring transmitters, sensors, and other analog field devices in safety-related automation applications. The 3721 is specified for Tricon systems version 10.2 and later.

Its differential input architecture, common-mode rejection, field-to-system isolation, and diagnostic status indicators support integration into demanding industrial measurement and safety applications. The module can also accommodate 0–20 mA signals when used with an appropriate 250 Ω shunt resistor.

🔧 Key Features

32 differential DC-coupled analog input channels
TMR analog input architecture
0–5 VDC or −5 to +5 VDC input range
Programmable 12-bit / 14-bit resolution
10 ms input update rate
Less than 0.15% FSR accuracy from 0°C to 60°C
10 MΩ minimum DC input resistance
−85 dB typical common-mode rejection
PASS, FAULT, ACTIVE, and FIELD status indicators
0–20 mA input capability with 250 Ω shunt resistor
150 VDC / 115 VAC continuous input over-range protection

📋 Product Datasheet

Parameter	Specification
Brand	TRICONEX
Model	3721
Series	Tricon Safety System
Product Name	Differential Analog Input Module
Module Type	TMR Analog Input Module
Input Channels	32 Differential, DC-Coupled
Input Range	0–5 VDC / −5 to +5 VDC
Resolution	12-bit or 14-bit Programmable
Input Update Rate	10 ms
Condition / Status	Verify actual item condition before installation

Technical Note: The documented 3721 specification identifies the module for Tricon v10.2 and later systems. Dimensions, shipping weight, and exact hardware revision can vary by configuration or production version, so these should be checked against the physical nameplate before replacement.

❓ Common Questions & Answers

Q: What is the TRICONEX 3721 used for?
A: It is used to acquire differential analog signals for Tricon safety and process-control applications.

Q: How many analog inputs does it provide?
A: The 3721 provides 32 differential, DC-coupled input signals.

Q: What input signals are supported?
A: The primary voltage ranges are 0–5 VDC and −5 to +5 VDC. A 0–20 mA signal can be accommodated using a 250 Ω shunt resistor.

Q: Is the 3721 a TMR module?
A: Yes. It is specified as a Triple Modular Redundancy (TMR) analog input module.

Q: Which Tricon system versions support the 3721?
A: Documentation specifies installation in Tricon v10.2 and later systems.

Q: Can another analog input module be substituted directly?
A: Do not assume direct interchangeability. Channel count, signal range, isolation, firmware, chassis compatibility, and system revision should all be verified before substitution.