GE,IS420UCSBH3A
GE,IS420UCSBH3A
GE,IS420UCSBH3A
GE,IS420UCSBH3A
GE,IS420UCSBH3A
GE,IS420UCSBH3A
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IS420UCSBH3A

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The General Electric IS420UCSBH3A is a deterministic controller purpose-built for GE Mark VIe turbine and critical asset control systems, combining real-time execution with triple-redundant I/O networking.
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Technical specifications for IS420UCSBH3A

  • Manufacturer:
    General Electric
  • Part Number:
    IS420UCSBH3A
  • Product Family:
    GE Mark VIe Distributed I/O
  • Product Type:
    UCSB CONTROLLER MODULE
  • Stock:
    1
  • MIcroprocessor:
    1200 MHz Intel EP80579
  • Operating System:
    QNX Neutrino
  • Power Requirements:
    28.7 W peak,17.3 W nominal
  • Input Voltage:
    18-36 VDC (Nominal 24/28 VDC)
  • Operating Temperature:
    0°C to 65°C
  • Weight:
    1.08 kg
  • Estimated shipping dimensions:
    4.8x15.8x20.2cm
  • Tariff Code:
    8537101190
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Applications Monitoring & Control Environmental Ratings

Features:

  • Interface Between the Industrial Control System and Mark VIe I/O Network
  • Combines Capability of Real-Time Control Processing with Redundant Controller Support
  • Operates in Conjunction with the Mark VIe Series and Standard I/O Packs
The IS420UCSBH3A operates as the Mark VIe or MarkStat Controller in a Mark VIe control system, providing reliable real-time control and data processing to all I/O packs within the system. It continuously executes control logic using its 1200 MHz Intel EP80579 microprocessor with 256 MB DDR2 SDRAM and distributes control commands through the triple redundant IONet (R/S/T) to support steady state operation of all I/O modules and field devices. Seamless controller operation is standard with the IS420UCSBH3A, however using an optional Redundant Controller Configuration will allow seamless switchover to a backup controller in the event of a primary controller failure. The IS420UCSBH3A has made improvements in several areas over previous controller designs in addition to incorporating universal 18-36 VDC input voltage capability within the Mark VIe rack.

The IS420UCSBH3A provides essential control functions common to the entire system, and is a critical component of the control path, directly affecting the proper, normal operation of the overall control system. One or two IS420UCSBH3A controllers are required per control segment depending on the desired redundancy level. The IS420UCSBH3A occupies a standard controller slot in the rack and is always located in the dedicated controller positions.

For Dual Redundant Controller applications, the Mark VIe System requires a second IS420UCSBH3A controller module installed in the redundant slot. In addition to standard single controller operation, the redundant configuration also performs automatic switchover. The Mark VIe dual controller configuration executes failover using the internal circuitry specified in the controller options. Using this method, the redundant controller system continually monitors the health of both controllers. If the system detects that the primary controller is no longer providing stable output (outside configured tolerance levels), it will automatically transfer the control load to the secondary controller and place an event in the System Event List.

The IS420UCSBH3A GE Mark VIe/MarkStat Controller may still be available for purchase and support from authorized distributors beyond End-Of-Life (EOL) by the manufacturer (OEM).

GE IS420UCSBH3A Mark VIe or MarkStat controller Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
GE IS420UCSBH3A Mark VIe or MarkStat controller

General

  • Manufacturer GE
  • Model IS420UCSBH3A
  • Condition New Original ready stock
  • Product Family IS420UCSBH3A-UCSB,IS420UCSBH3A-B,IS420UCSBH3A-D
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • High-Speed Turbine Control: Manages gas/steam turbine startup, loading, and grid sync with microsecond precision; executes fuel and IGV algorithms to avoid resonance.
  • Balance of Plant (BoP) Coordination: Controls auxiliary systems (lube oil pumps, cooling loops, breakers); ensures synchronization with turbine state to prevent nuisance trips.
  • MarkStat Regulation: Functions as a high-speed static regulator for gas compression stations, maintaining pressure/flow setpoints against variable pipeline demand.
  • Redundant Critical Processes: Supports seamless failover for 99.999% uptime (e.g., combined cycle plants, backup power); eliminates single-point-of-failure during firmware upgrades or hardware swaps.
  • IEEE 1588 I/O Synchronization: Synchronizes all I/O packs within 100 microseconds via R/S/T IONets; ensures accurate time-stamping for vibration monitors and trip signals across racks.
  • Lossless Redundancy Architecture: No input data loss when a controller is powered down; maintenance does not create a data gap.
  • Online Logic Modification: Supports rung/block edits without system restart; allows PID tuning and interlock changes online, reducing downtime.
  • Active/Standby Management: Front-panel "DC" LED indicates active master; shadow controller takes over within a single execution cycle on primary failure.
  • 0°C to +65°C ATEX T4 Rating: DEMKO-certified ambient range; surface temperature will not auto-ignite IIC group gases even at maximum load.
  • Hazardous Location Suitability: Certified for Class I, Div 2 (Groups A-D) and ATEX Zone 2, Group IIC; direct installation in turbine or compressor areas without expensive explosion-proof enclosures.
  • Passive FANLESS Cooling: Vertical cooling fins with natural convection eliminates fan failure points in dusty/humid environments; requires unobstructed vertical airflow for reliable thermal performance.
  • 18-36 VDC Wide Input Tolerance: Resilient against brownouts and 25% voltage sags; remains operational when large solenoids or actuators load the shared power bus.
Description
The General Electric IS420UCSBH3A operates as either a Mark VIe controller or a MarkStat controller, as officially documented in GEH-6725. Unlike generic PLCs, this module is architected for computational determinism in high-speed applications such as gas turbine startup, generator synchronization, and fuel path control. It does not host I/O directly but connects to all R, S, and T IONets, ensuring full access to system input data even when one controller is offline for maintenance.

Engineered for continuous operation in hazardous and harsh environments, the General Electric IS420UCSBH3A carries ATEX Zone 2, Group IIC and Class I Division 2 certifications. Its passive, fanless cooling design eliminates common failure points in dusty or humid industrial cabinets, while the wide 18–36 VDC input range provides resilience against power supply sags caused by large solenoids or actuators.

In redundant configurations, the General Electric IS420UCSBH3A supports seamless failover without system shutdown. The standby controller continuously shadows the active unit, taking over within one execution cycle upon primary failure. This architecture achieves 99.999% uptime for combined cycle plants, gas compression stations, and critical backup power applications.
Revisions

Revision Part #

Also known as

IS420UCSBH3A-UCSB
Series -UCSB, Rev -UCSB
IS420UCSBH3A-B
Series -B, Rev -B
IS420UCSBH3A-D
Series -D, Rev -D
IS420UCSBH3A-E
Series -E, Rev -E
IS420UCSBH3A-H
Series -H, Rev -H
Alternative Names
IS420UCSBH3A-UCSB IS420UCSBH3B IS420UCSBH3D IS420UCSBH3E IS420UCSBH3H IS420PPNGH1A IS420PUAAH1A IS420ESWBH3A
Technical notes
The General Electric IS420UCSBH3A utilizes an Intel EP80579 1200 MHz processor with 256 MB DDR2 SDRAM and operates within a certified ambient temperature range of 0°C to +65°C (T4 rating) per DEMKO 12 ATEX 1114875X.The General Electric IS420UCSBH3A requires no direct I/O backplane and relies entirely on the triple-redundant IONet (R/S/T) for data exchange, with IEEE 1588 clock synchronization across all I/O packs within 100 microseconds.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
What is IS420UCSBH3A ?
IS420UCSBH3A is a UCSB Controller Module developed by GE under the Mark Vle series.
What are the features of the IS420UCSBH3A processor?
It is powered by a quad-core CPU with pre-installed application software. The processor, which runs on the QNX Neutrino operating system, is built to provide real-time high-speed, and dependable operations.
What is the processor and memory configuration of the General Electric IS420UCSBH3A?
The General Electric IS420UCSBH3A is built around an Intel EP80579 processor running at 1200 MHz, with 256 MB DDR2 SDRAM (ECC) and 2 GB NAND flash for application storage.
What communication protocols does the General Electric IS420UCSBH3A support?
The General Electric IS420UCSBH3A supports Modbus TCP/IP, Ethernet Global Data (EGD), and proprietary GE IONet via dual ENET ports. It does not natively support PROFIBUS or PROFINET; external gateways are required for such integration.

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