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The IS420UCSBH4A is a high‑performance controller module manufactured by GE, belonging to the Mark VIe control system series. This Universal Control System Block (UCSB) module is designed to serve as the core processing element in critical applications such as turbine control (gas or steam), power generation, large industrial drives and process automation.
As part of the Mark VIe / Mark VIeS controller family, the IS420UCSBH4A features a powerful microprocessor architecture, real‑time operating system, on‑board I/O network interface (IONet), and redundant design for high availability. It is engineered for rugged industrial environments, offering minimal panel footprint, no battery/jumper settings, fanless cooling, and modular design simplifying maintenance.
The brand is GE, the series is Mark VIe / Mark VIeS – UCSB Controller Modules.
| Parameter | Specification |
|---|---|
| Model | IS420UCSBH4A |
| Brand | GE |
| Series | Mark VIe / Mark VIeS – UCSB Controller Modules |
| Processor | Intel EP80579 (≈ 1066 MHz) or equivalent high‑speed controller |
| Memory | e.g., 256 MB DDR2 SDRAM + Flash storage (varies by revision) |
| Power Supply | 24 V DC nominal (redundant inputs supported) |
| Operating Temperature | –40 °C to +70 °C |
| Storage Temperature | –40 °C to +85 °C |
| Mounting / Form Factor | Panel‑mounted module, rack slot compatible |
| Dimensions (W × H × D) | Approx. 127 mm × 178 mm × 76 mm (various sources) |
| Weight | Approx. 1.3 kg |
| Communication Interfaces | Ethernet (10/100 Mbps) for IONet & control network |
| I/O Network | IONet interface to I/O packs (R, S, T networks) |
| Certifications / Safety | SIL2/SIL3 capable in redundant configurations; real‑time OS (QNX) |
| Typical Applications | Turbine control, compressor drives, power generation, process automation |
Control of gas turbines and steam turbines in power generation plants, managing speed, load, fuel control, sequencing, protection.
Large industrial drive systems (compressors, pumps, generator sets) where high‑speed control logic and real‑time data handling are required.
Process automation systems in oil & gas, petrochemical, refineries and industrial plants with high availability and redundancy demands.
Retrofit or upgrade of aging control systems in legacy installations, providing a modern controller module with reduced footprint and improved diagnostics.
Safety‑instrumented systems (SIS) where redundant controllers are used with high integrity functions, leveraging the UCSB architecture for reliability.
High‑performance processing: The dedicated controller architecture and fast microprocessor enable execution of complex control logic, real‑time communications, and large I/O volumes.
Rugged and reliable design: Built without fans, with no batteries or jumpers, supporting wide ambient temperature, vibration and shock immunity.
Compact footprint and modularity: Reduced panel space is required; the module plugs into standard rack systems, making board‑level replacement straightforward.
Redundancy capable & safety ready: Supports redundant configurations (dual, triple modular redundancy) for mission critical systems; supports SIL2/SIL3 frameworks.
Seamless integration: Designed for compatibility within the Mark VIe/VIeS ecosystem; integrates via IONet with standard I/O packs and control infrastructure.
Reduced maintenance overhead: With fanless cooling, no battery replacements, and simple firmware updates, maintenance costs and downtime can be minimised.
| Model | Type | Description | Key Specification |
|---|---|---|---|
| IS420UCSBH3A | Controller Module | Prior version UCSB controller | Similar form‑factor; ~1.3 kg |
| IS420UCSCH1B | Controller Module | High‑end UCSC variant with expanded capability | Enhanced I/O, higher capacity |
| IS420UCSBS1A | Safety Controller Module | Safety variant of UCSB for SIS applications | SIL3 certified |
| IS420PAICH2A | Analog Input Module | Works alongside UCSB controller for analog signal processing | I/O module |
| IS420ESWBH4A | Ethernet Switch Module | IONet switch module for network connectivity in rack | Networking hardware |
| Model | Series | Type | Key Specification |
|---|---|---|---|
| IS220AIIBH2A | Mark VIe | Analog Input I/O Module | For turbine/generator analog signals |
| IS200VCMIH2BCC | Mark VIe | Bus Master Controller Board | Controls IONet network connectivity |
| IS420ESWBH3A | Mark VIe | IONet Ethernet Switch Module | Network switching in control rack |
| IS430SNUAH1A | Mark VIe | I/O Module (Analog/Digital) | General I/O interface module |
| IC697CPG302 | PACSystems | CPU Controller Module | High‑performance PLC‑type controller |
Q1: What is the primary function of the IS420UCSBH4A?
A1: It serves as the main controller module in the Mark VIe control system, executing control logic, managing communications, and interfacing with I/O networks in turbine and industrial automation applications.
Q2: What power supply does this module require?
A2: A nominal 24 V DC supply with support for redundant power inputs for enhanced reliability.
Q3: What are its physical dimensions and weight?
A3: Dimensions are approximately 127 mm × 178 mm × 76 mm and the weight is about 1.3 kg.
Q4: What ambient temperature range does it support?
A4: Operating range is roughly –40 °C to +70 °C; storage range is –40 °C to +85 °C.
Q5: Does it support redundant or safety‑critical systems?
A5: Yes, the module supports redundant configurations and is compatible with safety systems (SIL2/SIL3) when used with appropriate modules.
Q6: What communications and I/O network does it interface with?
A6: It uses the IONet network for communication with I/O packs, and supports Ethernet connectivity for control/engineering access.
Q7: Can the module be used for retrofit projects?
A7: Yes, it is often used to replace or upgrade legacy controllers in turbine, compressor or power‑generation control systems due to its modern architecture and reduced footprint.
Q8: What maintenance characteristics does it have?
A8: Fanless, no battery or jumper settings, modular design—all contributing to lower maintenance and reduced downtime.
Q9: Is it compatible with the Mark VIe ecosystem?
A9: Yes, it is designed for full compatibility with the Mark VIe/VIeS system architecture and IONet I/O modules.
Q10: What industries commonly use the IS420UCSBH4A?
A10: Power generation, oil & gas, petrochemical, large manufacturing, turbine drive systems, and any application needing real‑time, high‑availability control.
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