General Electric IS420YDIAS1B Discrete Contact I/O Module

Product Overview

The GE IS420YDIAS1B is a Discrete Contact I/O Pack for the Mark VIeS functional safety system. It provides the electrical interface between one or two I/O Ethernet networks and a discrete input terminal board, supporting 24 contact inputs with 1500 V isolation. The pack features a common processor board and a dedicated acquisition board, with dual RJ-45 Ethernet connectors and a three-pin power input for redundant network connectivity. Reference: GEH-6855 (Mark VIeS Functional Safety).

Key Specifications

• Model: IS420YDIAS1B
• Type: Discrete Contact I/O Pack
• Series: Mark VIeS
• Channels: 24 discrete contact inputs
• Input Isolation: 1500 V
• Input Filter AC Rejection: 125 V DC
• Input Threshold: 50% of contact wetting voltage (clamped to 13% minimum)
• Under-Voltage Detection: Annunciates when wetting voltage drops below 40% nominal
• Power Supply: 28 VDC nominal (via 3-pin connector)
• Ethernet: Dual RJ-45 connectors (redundant IONet)
• Field Connection: DC-37 pin connector to terminal board
• Dimensions: 8.26 × 4.19 × 12.1 cm (H × W × D)
• Weight: 0.8 kg
• Operating Temperature: -40°C to +70°C

Environmental & Safety Certifications

• Operating Temperature: -40°C to +70°C
• Storage Temperature: -40°C to +85°C
• Humidity: 5% to 95% RH (non-condensing)
• Safety Rating: SIL 2 / SIL 3 capable (Mark VIeS)
• Hazardous Locations: Class I Div 2 / ATEX Zone 2

Installation Guide

1. Mount the IS420YDIAS1B I/O pack directly onto the compatible terminal board (e.g., TBDI).
2. Connect dual RJ-45 Ethernet cables to primary and redundant IONet switches.
3. Apply 28 VDC power via the 3-pin connector.
4. Configure input debounce, threshold, and alarm parameters via ToolboxST.
5. Verify each input channel using the onboard yellow status LEDs and forced-input test mode.

FAQ

• Q: What is the difference between YDIAS1A and YDIAS1B?
  A: The S1B revision features updated ATEX Zone 2 Group IIC certification and enhanced hardware compared to S1A.
• Q: Can YDIAS1B be used in TMR configurations?
  A: Yes, three YDIAS1B packs can be deployed in TMR for safety-critical applications.
• Q: What terminal boards are compatible?
  A: It mates with Mark VIeS discrete input terminal boards via the DC-37 pin connector.
• Q: How does the under-voltage detector work?
  A: If contact wetting voltage drops below 40% of nominal, the module annunciates a fault to the controller.

Selection Tips

• Specify IS420YDIAS1B for Mark VIeS safety systems requiring 24-channel discrete input acquisition.
• Ensure compatible terminal boards and 28 VDC power supplies are available.
• Use dual Ethernet connections for redundant IONet architectures.

Data Source: Verified against GE official manual GEH-6855 (Mark VIeS Functional Safety) and WOC hardware specifications.