Triconex 3721 Tricon 3000 Series Input Module

Availability: 10 left in stock

Triconex 3721 Tricon 3000 Series Module Configured for high-density signal processing and electrical voltage verification in Tricon 3000 Series SIS...

SKU: 3721

Manufacturer: Triconex
Product No.: 3721
Product Type: Analog Input Modules
Product Origin: USA
Payment:T/T, Western Union
Weight: 1360g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Triconex 3721 Tricon 3000 Series Module

Configured for high-density signal processing and electrical voltage verification in Tricon 3000 Series SIS platforms, the Triconex 3721 (3721 Analog/Digital Input Module) provides direct physical/electrical execution. The component executes real-time data acquisition from field circuits, routing isolated input pathways directly to the primary safety controller backplane matrix.

Hardware Specifications

Parameter	Specification
Model	3721
Brand	Triconex (Schneider Electric)
Origin	United States
Weight	1.36 kg (1.5 kg)
Dimensions	177.8 mm x 101.6 mm x 228.6 mm
Operating Temp	-20 to +60 deg C (FSR validated from 0 to 60 deg C)
Power Consumption	Not specified / Backplane distributed
Input Channels	32 differential, DC-coupled (or 32 isolated digital inputs)
Voltage Range	0 to 5 VDC, -5 to +5 VDC (+6%), or 18-32 VDC logic inputs
Input Update Rate	10 ms
Resolution	12 bits or 14 bits programmable
Accuracy	< 0.15% of FSR
Common Mode Rejection	-85 dB (DC - 100 Hz)
Input Overrange Protection	150 VDC / 115 VAC continuous
Isolation	1500 VAC galvanic isolation between channels and backplane
Diagnostics	Continuous per-channel monitoring, LED indicators, fault detection
Certifications	IEC 61508 SIL3, IEC 61511, TÜV, CE, UL Class I Div 2, ATEX Zone 2

Triple Modular Redundancy and Safety Integrity

The module hardware uses a triple modular redundancy (TMR) 2oo3 architecture paired with internal voter logic circuitry to achieve continuous fail-safe state execution. Three separate logic legs handle concurrent processing of the incoming 32 channels, cross-checking values to eliminate single-point hardware faults. Galvanic isolation up to 1500 VAC protects the subsystem by separating the field channels and the primary backplane bus. These structural diagnostic layers allow the module to maintain active state operation and safety loops under strict IEC 61508 SIL3 certification parameters.

Frequently Asked Questions

Q: What are the physical operational limitations during a hot-swap procedure?

A: The module supports online hot-swap operations within a single rack slot allocation. The replacement procedure must execute while the system is energized, allowing the backup or adjacent redundant channels to manage the processing loop during the physical swap without causing shutdown initialization.

Q: How does the interface architecture handle signal validation overvoltage spikes?

A: The hardware includes built-in input overrange protection rated up to 150 VDC or 115 VAC continuous. This protection array works in tandem with the galvanic isolation barrier to isolate high-voltage spikes and prevent degradation of the core logic solvers.

Field Installation Guidelines

Mount the module vertically inside the designated slot position of the Tricon 3000 Series SIS rack. Confirm the guide pins route securely into the rear backplane connectors before engaging the faceplate locking screws. Field technicians must terminate all external circuits at the corresponding termination baseplate. Apply continuous cable shielding and low-impedance grounding across all low-level signal paths to minimize electromagnetic interference (EMI). Maintain strict physical separation between data signaling lines and high-voltage AC power loops inside the enclosure to eliminate induction errors.

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