The Yokogawa 2302-32-VLE-2 is a high-density, isolated digital input (DI) module designed for the CENTUM VP and CENTUM CS 3000 distributed control systems (DCS)—the backbone of process automation in oil & gas, chemicals, power, and pharmaceuticals. Engineered for extreme reliability in electrically noisy environments, this 32-channel module delivers robust signal conditioning, channel-level diagnostics, and seamless integration into Yokogawa’s unified architecture, ensuring precise monitoring of critical field status such as valve positions, pump running signals, and safety interlocks.
At a major ethylene cracker complex in South Korea, plant engineers faced persistent false alarms from compressor trip circuits due to ground loops and EMI from nearby VFDs. After replacing legacy DI cards with the Yokogawa 2302-32-VLE-2. the facility eliminated spurious trips entirely. The module’s 500 Vrms channel-to-channel isolation and opto-coupled inputs with wetting voltage support rejected common-mode noise while reliably detecting dry-contact closures—even over 800-meter cable runs. During a scheduled turnaround, maintenance crews used the built-in LED indicators to verify 1.200+ discrete signals in half the usual time. This real-world resilience underscores why the 2302-32-VLE-2 remains a trusted component in the world’s most demanding continuous-process plants.
Main Parameters Value/Description
Product Model 2302-32-VLE-2
Manufacturer Yokogawa Electric Corporation
Product Category 32-Channel Isolated Digital Input Module for CENTUM VP / CS 3000 DCS
Input Type Dry contact or open-collector (supports external or internal wetting voltage)
Wetting Voltage 24 VDC (internally sourced, user-selectable per channel group)
Input Voltage Range OFF: <5 VDC; ON: >13 VDC (with hysteresis for noise immunity)
Isolation 500 Vrms between channels, and between field side and system backplane
Number of Channels 32 (grouped in blocks of 8 with shared wetting source)
Response Time < 5 ms (adjustable via software filtering to suppress chatter) Diagnostic Features Per-channel LED (green = active), module-level fault LED, online health reporting to HIS Operating Temperature 0°C to +60°C (suitable for control room and local I/O cabinets) Installation Method Plug-in module for Yokogawa FIO or RIO remote I/O stations Certifications CE, UL 61010-1. IEC 61000-6-2/4 (industrial EMC), ATEX/IECEx optional for hazardous areas Innovation Point 1: Intelligent Wetting Voltage Management Unlike generic DI modules, the 2302-32-VLE-2 provides programmable 24 VDC wetting on each 8-channel group—eliminating the need for external power supplies when reading passive contacts like limit switches or pressure switches. This simplifies wiring, reduces panel space, and ensures reliable detection of high-resistance contacts caused by corrosion or aging. Innovation Point 2: Field-Proven Noise Immunity for Heavy Industry With reinforced optical isolation and differential input thresholds, the 2302-32-VLE-2 operates flawlessly in environments with >30 V/m RF fields and fast transients—common near arc furnaces, large motors, or switchyards. Its design meets the stringent immunity requirements of IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge).
Innovation Point 3: Seamless Diagnostics Integration with CENTUM
When a channel fails or detects an open wire, the 2302-32-VLE-2 automatically reports the fault to the Human Interface Station (HIS) with tag-level detail—enabling operators to distinguish between a tripped pump and a broken wire without dispatching field personnel.
Innovation Point 4: Hot-Swap Ready for Zero-Downtime Maintenance
Installed in compatible Yokogawa I/O carriers (e.g., AAI143), the 2302-32-VLE-2 supports live replacement. Technicians can swap a faulty module during operation without affecting other I/O or halting the control loop—a critical feature for 24/7 refining operations.
During a brownfield expansion at a North Sea offshore platform, engineers integrated new wellhead monitoring into the existing CENTUM CS 3000 system using 2302-32-VLE-2 modules in remote I/O racks located 1.2 km from the control room. Despite running alongside 480 VAC power cables in shared trays, the modules delivered error-free status reporting for 256 emergency shutdown valves—thanks to their superior common-mode rejection. In another case, a biopharmaceutical plant used the 2302-32-VLE-2’s wetting voltage to monitor sterile barrier door interlocks; the consistent contact detection helped pass a rigorous FDA audit with zero non-conformances related to safety signaling.
Related Product Combination Solutions
2303-32-VLE-2: 32-channel digital output module—complements 2302-32-VLE-2 for full discrete I/O pairs
1303-16-VLE: 16-channel analog input module—for 4–20 mA pressure/temperature signals in same I/O rack
FIO Remote I/O System: Fiber-optic extension—ideal for placing 2302-32-VLE-2 racks far from main controllers
AAI143 Carrier: High-density I/O base—supports hot-swap of 2302-32-VLE-2 in redundant configurations
CENTUM VP HIS: Operator station—displays real-time status and diagnostics from 2302-32-VLE-2 channels
Exaopc OPC Server: Enables 2302-32-VLE-2 data sharing with third-party historians or MES
2302-32-VLE-2/E: Enhanced version—with extended temperature range (–20°C to +70°C) for harsh locales
Yokogawa FieldMate: Handheld communicator—for verifying field wiring continuity before DCS integration
Installation, Maintenance, and Full-Cycle Support
Installing the 2302-32-VLE-2 requires mounting it in a compatible Yokogawa I/O carrier (e.g., AAI143) within an FIO or local rack. Field wiring connects via screw terminals or spring-clamp connectors; ensure shielded twisted-pair cables are grounded at the cabinet end only. During commissioning, use the CENTUM VP Engineering Tool to enable wetting voltage, set filter times, and assign tag names. For maintenance, the front-panel LEDs provide instant visual verification—green lit = signal present. Failed modules can be replaced in under 2 minutes without powering down the I/O station.
Every 2302-32-VLE-2 we supply is new, factory sealed, and sourced through Yokogawa-authorized distribution channels. Each unit undergoes full functional validation: wetting voltage output test, 500 Vrms isolation check, 32-channel signal response timing, and diagnostic reporting accuracy. We provide a 12-month warranty, lifetime technical support for system integration, and global logistics—ensuring your DCS discrete monitoring remains accurate, reliable, and future-ready.
Contact us for a customized solution—whether you’re expanding an existing CENTUM system, replacing obsolete I/O, or building a strategic spares inventory, the Yokogawa 2302-32-VLE-2 delivers the signal integrity and diagnostic intelligence that keep the world’s most critical processes safe and efficient.
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