PI2381 | Triconex Pulse Input Module for Industrial Safety

Product Description

The TRICONEX PI2381 (7400221-100) is a pulse input baseplate and module designed for Schneider Electric’s Triconex safety instrumented systems. It reliably acquires high-speed pulse signals from field devices, enabling accurate monitoring of speed, frequency, and flow conditions in safety-critical environments.

This module operates within a Triple Modular Redundant architecture, therefore eliminating single points of failure during continuous operation. Moreover, its robust isolation and precision signal processing ensure dependable data acquisition, even in electrically noisy industrial environments.

The PI2381 is widely deployed in industries where overspeed detection and real-time pulse monitoring are essential. For instance, it supports turbine protection, compressor monitoring, and flow measurement applications with deterministic performance and SIL 3 compliance.

Technical Specifications

Product Type: Pulse Input Module / Digital Input Baseplate
Model Number: TRICONEX PI2381
Part Number: 7400221-100
Manufacturer: Schneider Electric (Triconex)
Architecture: Triple Modular Redundant (TMR)
Safety Integrity: IEC 61508 SIL 3 certified
Function: High-speed pulse signal acquisition

Input Channels:

• 16 isolated pulse input channels

Signal Characteristics:

• Input signal type: Pulse signals from magnetic pickups, proximity probes, flow sensors

• Input voltage range: 0.5 – 24 VDC (sensor dependent)

• Frequency range: 0.1 Hz to 20 kHz typical

• Resolution: 1 pulse

Performance and Protection:

• Isolation: Optical and electrical isolation between channels

• Diagnostics: Continuous self-test, fault detection, LED indicators

• Response behavior: Fast, deterministic for protection applications

Environmental Ratings:

• Operating temperature: 0 °C to +60 °C

• Storage temperature: –40 °C to +85 °C

• Relative humidity: 5% to 95%, non-condensing

Mechanical Data:

• Mounting: Rack-mount within Triconex chassis

• Dimensions: 114 × 127 × 108 mm

• Weight: 1.0–1.2 kg

Standards and Compliance:

• IEC safety standards

• API 670 compliance

FAQ

What is the primary function of the TRICONEX PI2381?
The PI2381 acquires high-speed pulse signals for speed, frequency, and flow monitoring in safety systems.

How many input channels does the PI2381 support?
It provides 16 isolated pulse input channels within a single module.

Is the PI2381 suitable for overspeed protection applications?
Yes, it supports high-frequency inputs up to 20 kHz, making it ideal for overspeed detection.

Does this module support SIL 3 safety systems?
Yes, the PI2381 is certified to IEC 61508 SIL 3 for safety-critical applications.

Can it integrate with existing Triconex systems?
Yes, it works seamlessly within Triconex TMR architectures and TriStation environments.