Basic Information

• Model: IS220PDIOH1B

• Assembly Part Number: 336A5026ADP6

• Brand & Series: GE Speedtronic Mark VIe Gas/Steam Turbine Control System, PDIO Discrete I/O Pack Series

• Product Type: Distributed Discrete Digital Input/Output (DI/DO) I/O Module, Field Signal Interface I/O Pack

• Compatible Systems: Mark VIe/VIeS TMR (Triple Modular Redundant) Control System, works with TDBS/TDBT terminal boards (ISx0yTDBSH2A, TDBSH8A, TDBTH2A, TDBTH8A)

• Country of Origin: USA

• Function: Core field discrete I/O interface for Mark VIe control system, acquires 24VDC digital switch/contact signals, outputs control signals to relays/actuators, with on-board processor, dual Ethernet communication, channel isolation and fault diagnostics, approved for hazardous locations (Class I Div 2/Zone 2), enabling high-speed, reliable data exchange between field devices and controller

Product Overview

Core Functions

1. 24DI + 12DO Isolated Channels: 24-channel 24VDC isolated digital inputs (DI, contact wetting/dry contact), 12-channel Form C mechanical relay isolated digital outputs (DO), electrical isolation between channels and to ground, strong anti-electromagnetic interference capability.

2. On-Board Intelligent Processing: Equipped with a 32-bit on-board processor, independently performs signal filtering, debouncing, diagnostics, and logic preprocessing, reducing main controller load with response time <1ms.

3. Dual Redundant Ethernet Communication: Dual RJ45 10/100Mbps full-duplex Ethernet ports, supporting Mark VIe IONet industrial Ethernet, dual-network redundancy and hot-standby switching to ensure uninterrupted communication.

4. Channel Protection & Diagnostics: Built-in overvoltage, overcurrent, short-circuit, reverse-polarity protection; supports input open/short circuit, output relay fault, power abnormality diagnostics; on-board LED status indicators (power, Ethernet, channel, alarm) for quick fault location.

5. Hazardous Location Certification: Certified for Class I Division 2, Zone 2 Group IIC, ATEX, for direct use in hazardous explosive industrial sites.

6. Redundancy & Hot-Swapping: Supports simplex/dual-redundant configurations, online hot-swapping without system interruption, convenient for maintenance and replacement.

7. Wide-Temperature Industrial Design: Industrial-grade PCB, UL94 V‑0 flame retardant, anti-vibration/anti-EMI, adapting to harsh environments in power plants and petrochemical facilities.

Technical Specifications

• Power Supply: Nominal 28VDC (range 27.4–32VDC), typical power consumption 8W

• Digital Inputs (DI): 24 channels, 24VDC (18–30VDC), dry/wet contact, input current 5mA/channel, isolation voltage ≥1500VAC, response time <1ms

• Digital Outputs (DO): 12 channels, Form C mechanical relay, contact rating 2A@24VDC, switching voltage 30VDC, isolation voltage ≥1500VAC, mechanical life ≥10⁷ operations

• Communication: Dual RJ45, 10/100Mbps full-duplex, IONet protocol, redundant communication

• Processor: 32-bit high-performance microprocessor, local real-time signal processing

• Temperature: Operating -30°C to +65°C; Storage -40°C to +85°C

• Protection: IP20 (cabinet-mounted), UL94 V‑0 flame retardant, anti-vibration and anti-electromagnetic interference (EMI)

• Mounting: Standard Mark VIe cabinet slot, hot-swappable, with TDBS/TDBT terminal boards (ISx0yTDBSH2A/8A, TDBTH2A/8A)

• Certifications: Class I Div 2, Zone 2 IIC, ATEX, CE, UL 61010-1, IEC 61508 SIL 2

• Dimensions/Weight: Standard Mark VIe I/O pack size, weight <2lbs (≈0.9kg)

Typical Applications

• Start/stop control, valve interlock, protection trip, limit/state signal acquisition for Mark VIe/VIeS gas turbines and steam turbines

• Discrete device control and safety interlocking for combined-cycle power plants, petrochemical compressor/pump units, offshore platforms

• Field digital I/O signal interface in hazardous explosive areas (Class I Div 2/Zone 2)

• Replacement of distributed discrete I/O modules for legacy Mark VI system upgrades

• SIL 2 safety-rated unit protection and emergency shutdown logic control