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SPECIFICATIONS:
Part Number: IS421UCSBH4A
Manufacturer: General Electric
Series: Mark VIeS
Product Type: High-Performance Controller Module
Number of channels: 24
Power supply voltage: 28 V dc
Analog output current: 0-20 mA
Core Processor: Intel� EP80579 Integrated Processor
ControlST Software Suite Version: V06.01
Processor Clock Speed: 1066 MHz
Voltage Range: 14 to 32 V dc
Nominal Supply Voltage: 24 V DC / 28 V DC
Input Voltage Range: 18 V DC
Mounting: DIN-rail mounting
Technology: Surface mount
Operating temperature: -30 to 65�C
Size: 33.02 cm high x 17.8 cm
Repair: 3-7 Days
Availability: In Stock
Weight: 2 lbs
Country of Origin: United States
Manual: GEH-6721_Vol_II_BL
IS421UCSBH4A is a UCSB Controller Module designed and manufactured by General Electric as part of the Mark VIeS Series used in GE Distributed Control Systems. The UCSBH4A controllers are stand-alone computers that run the application code. The controller mounts in a panel and communicates with the I/O packs through on-board I/O network (IONet) interfaces. IONet is a private special-purpose Ethernet that only supports Mark controls I/O modules and controllers. The controller operating system (OS) is QNX Neutrino, a real-time, multitasking OS designed for high-speed, high-reliability industrial applications. Unlike traditional controllers, where I/O is on a backplane, the UCSB controller does not host any application I/O. Also, all I/O networks are attached to each controller, providing them with all input data. The hardware and software architecture guarantees that no single point of application input is lost if a controller is powered down for maintenance or repair.
The Mark VIeS UCSBH4A Safety controller and Safety I/O modules are used for functional safety loops to achieve SIL 2 and 3 capabilities. Mark VIES Safety equipment is used by operators knowledgeable in safety-instrumented system (SIS) applications to reduce risk in critical safety functions. Safety controllers and distributed I/O modules are programmed specifically for safety control use, and this specific control hardware and software have IEC 61508 certification. The UCSB controllers offer the following advantages:
UCSBH4A INSTALLATION:
The controller is contained in a single module that mounts directly to the panel sheet metal. The following diagrams display the module envelope and mounting dimensions. All dimensions are in inches. The UCSB is to be mounted to the panel as shown, with vertical air flow through the fins to be unobstructed.
UCSBH4A SOFTWARE AND COMMUNICATION:
The controller is loaded with software specific to its application. It can run on rungs or blocks. Minor modifications to the control software may be made online without requiring a restart. The IEEE 1588 protocol is used through the R, S, and T IONets to synchronize the clock of the I/O packs and controllers to within �100 microseconds. External data is transferred to and from the control system database in the controller over the R, S, and T IONets. This includes process inputs/outputs to the I/O modules. In a dual system, this also includes:
UCSBH4A BOOT LED:
The boot LED is lit continuously during the boot process unless an error is detected. If an error is detected, the LED flashes at a 1 Hz frequency. The LED, when flashing, is on for 500 ms and off for 500 ms. After the flashing state, the LED turns off for three seconds. The number of flashes indicates the failed state. If the flash image is valid but the runtime firmware has not been loaded, the boot LED flashes continuously at a 1 Hz rate. Once the firmware is loaded, the boot LED turns off. If the controller does not go online, use the ToolboxST application to determine why the controller is blocked. Once an IP address has been assigned, the ToolboxST application uses the Ethernet for configuration.
World of Controls specializes in supplying high-quality, warranty-backed OEM replacement parts, including unused surplus and professionally rebuilt components for critical turbine control and industrial automation systems like the General Electric Mark VIe and Mark VIeS systems. To minimize customer downtime and ensure original equipment standard compliance, every component undergoes rigorous inspection, testing, and verification in an advanced electronics lab. Beyond parts distribution, the company delivers comprehensive, global support through 24/7 technical assistance, expert troubleshooting, component repair services, and rapid shipping, ensuring optimal efficiency and long-term reliability for critical industrial operations worldwide.
What is GE IS421UCSBH4A?
It is a UCSB Controller Module used in General Electric Mark VIeS control systems. It is a real-time industrial controller responsible for executing application logic, managing system communication, and coordinating distributed I/O through the IONet network in turbine and process control environments.
What type of processor is used in the UCSB Controller Module?
It uses an Intel EP80579 integrated processor operating at 1066 MHz, designed for embedded industrial applications requiring deterministic execution and real-time control performance.
What differentiates the H4A variant from standard H1A UCSB controllers?
The H4A variant features a higher-clocked 1066 MHz Intel processor, providing faster control sequence execution and superior computation throughput compared to the 600 MHz processor found in the baseline models.
Does this controller require a dedicated mounting rack or backplane?
The UCSBH4A is a stand-alone panel-mount or DIN-rail mount module that requires no active backplane chassis. It draws power directly from a secure connector and handles communications over independent Ethernet ports.
What is the nominal operating input power required for this module?
The board runs on a nominal input rating of 24 V DC or 28 V DC, accepting a working range from a minimum of 18 V DC up to a maximum threshold of 30 V DC at 1.5 Amps.
