EMERSON VE4031S2T2B1 Redundant Discrete Input Cards 24Vdc 8 Channels

EMERSON VE4031S2T2B1 Redundant Discrete Input Cards 24Vdc 8 Channels

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The Emerson VE4031S2T2B1 (also designated as KJ3201X1-BA1) serves as a redundant discrete input module exclusively engineered for the DeltaV M-series Distributed Control System. It is equipped with a redundant standard I/O termination block and offers support for 8-channel discrete inputs, specifically designed to accommodate 24 VDC dry contact signals. Tailored for applications where high reliability is non-negotiable, this module processes input signals from on-site devices—such as switches and relays—across critical industries including oil and gas, chemical, and power generation. Its built-in redundancy ensures uninterrupted system operation, even in the event of component failure.​
Technical Specifications​

• Model: VE4031S2T2B1 (alternate part number: KJ3201X1-BA1)​
• Series: DeltaV M-series​
• Module Type: Redundant discrete input module with 8 channels, compatible with 24 VDC dry contact inputs​
• Discrete Input Channels: 8​
• Input Signal Requirement: 24 VDC, dry contact​
• LocalBus Power Consumption: 12 VDC at 100 mA​
• Field Circuit Power Consumption: 24 VDC at 75 mA​
• Weight: 0.3 kg​
• Operating Temperature Range: -40°C to +70°C​
• Storage Temperature Range: -40°C to +85°C​
• Relative Humidity Tolerance: 5% to 95% (non-condensing)​
• Protection Rating: IP20​
• Airborne Contaminant Resistance: Compliant with ISA-S71.04-1985 Class G3; features conformal coating for enhanced protection​
• Mounting Compatibility: T-type DIN rail (installed on an I/O carrier)​
• Certifications: CE, CSA, FM, ATEX, IECEx, and marine certifications (ABS, DNV)​
• System Compatibility: Works with DeltaV v8.3 or later versions​

Key Functionality & Environmental Durability​

1. Functional Capabilities​

The VE4031S2T2B1 is designed to process signals from eight 24 VDC dry contact discrete inputs, enabling reliable data collection from field-based devices. A standout feature is its redundant termination block: if the primary module encounters a fault, the system automatically switches to a backup module, ensuring no disruption to operation. Additionally, the module supports hot-swappable installation—this allows for maintenance or replacement work to be carried out without shutting down the entire system, minimizing downtime. It also includes built-in diagnostic functions that can detect open or short circuits, simplifying troubleshooting and reducing maintenance time.​

2. Environmental Resilience​

Engineered to withstand harsh industrial conditions, the VE4031S2T2B1 is equipped with conformal coating, which provides a protective barrier against airborne contaminants and helps prevent damage from moisture or dust. Beyond this, it maintains stable performance across extreme temperature ranges, as well as in environments with high levels of shock and vibration—making it suitable for use in demanding on-site settings where environmental factors often pose challenges to equipment reliability.