The TRICONEX 3721 Differential Analog Input Module is a high-reliability component designed for safety-critical industrial control systems, particularly in Triconex Safety Instrumented Systems (SIS).
Its core functions and applications include:
1. Core Functions
Analog Signal Acquisition:
Converts differential analog signals (e.g., -5V to +5V, 0-10V) from sensors (e.g., pressure, temperature) into digital data for processing by the Triconex SIS.
Supports 32 differential input channels, each with independent signal conditioning and A/D conversion.
Triple Modular Redundancy (TMR):
Uses 3-channel parallel processing with majority voting to ensure continuous operation even if one channel fails, meeting IEC 61508/SIL 3 standards.
High Precision & Diagnostics:
Offers programmable 12/14-bit resolution and accuracy within 0.15% FSR (0°C–60°C).
Features real-time diagnostics (PASS/FAULT/ACTIVE/FIELD indicators) for fault detection.
2. Key Features
Isolation: Provides 420 kΩ inter-channel isolation to prevent signal interference.
Fast Sampling: Updates inputs every 10ms for dynamic process control.
Hot-Swap Capability: Allows online module replacement without system downtime.
3. Applications
Safety-Critical Systems:
Emergency shutdown (ESD) in oil/gas and chemical plants.
Fire & gas detection and turbine control.
Process Monitoring:
High-accuracy measurement of flow, pressure, and temperature in power/water treatment.
4. Advantages
Fault Tolerance: TMR design ensures 99.9999% availability.
Flexibility: Configurable input ranges and scalable channel density.
For wiring or voltage specifications, consult technical manuals.
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