GE IS200ACLEH1A Application Control Layer Module

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GE IS200ACLEH1A Application Control Layer Module.

The research confirms that this board is a critical central processing unit (CPU) within GE’s high-reliability systems, primarily the Mark VI Speedtronic Turbine Control System and the EX2100 Excitation Control System. The functional acronym, ACLE (or ACL), stands for Application Control Layer Module.¹

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Product Description

The GE IS200ACLEH1A Application Control Layer Module (ACLE) is a microprocessor-based master controller that serves as the brain for its control system rack.² It is a fundamental component designed to manage and execute the primary control logic and communication functions for high-value rotating machinery.

Installed in a specialized rack (often VME-based) in systems like the Mark VI or the EX2100 Exciter, the ACLE handles several critical duties:³

• Application Execution: It runs the main control algorithms (often in a proprietary Blockware language) at deterministic rates (e.g., $10 \text{ ms}$), managing core functions like Automatic Voltage Regulation (AVR), Power System Stabilization (PSS), and Under Excitation Limit (UEL) control in Exciter applications.
• Communication Hub: It manages data exchange across various networks, including Ethernet (for HMI and plant-level communication) and proprietary high-speed buses like the ISBus or IONet (for I/O module communication).⁴

The GE IS200ACLEH1A (Placeholder Link: GE Automation Solutions Product Page) typically occupies two slots and is built with robust features like an embedded CPU (often a $100 \text{ MHz}$ 486-class processor) and a real-time operating system (like QNX) to ensure the deterministic, non-stop operation required for turbine and generator control. The board GE IS200ACLEH1A (Placeholder Link: GE Automation Solutions Product Page) features a metal faceplate with diagnostic LEDs (Active, OK, ENET, etc.) and a reset switch. The GE IS200ACLEH1A (Placeholder Link: GE Automation Solutions Product Page) is a central point for configuration via the GE Control Systems Toolbox.

Product Parameters

As a core processor and communication module, its key technical specifications include:

• Manufacturer/Series: General Electric, Mark VI Speedtronic Control System and EX2100 Excitation Control.⁵
• Product Type: Application Control Layer Module (ACLE/ACL).⁶
• Processor: Embedded CPU (e.g., ⁷$100 \text{ MHz}$ 486-class) with L1/L2 cache.⁸
• Memory: Typically includes DRAM (for application runtime) and Flash memory (for OS/BIOS/Firmware).⁹
• Operating System: Real-time operating system (e.g., QNX-based) for deterministic control.
• Communication Ports: Ethernet (10/100 Mbps), two RS-232 Serial Ports (¹⁰$\text{COM1/COM2}$), and proprietary bus interfaces.¹¹
• Mounting: Plugs into a VME or proprietary backplane (e.g., Exciter Backplane – EBKP).¹²
• Coatings: Often Conformal Coated (denoted by the ‘H’ in the suffix) for environmental protection.¹³

Advantages and Features

• High Determinism: The combination of dedicated hardware and a real-time OS ensures control logic executes with extremely precise and predictable timing, which is vital for turbine stability and protection.
• System Integrity: Acts as the single point of control for the control rack, synchronizing I/O across the proprietary communication network.
• Legacy and Current Support: Used across mature platforms (Mark VI) and integrated into systems like the EX2100 Exciter, offering specialized control functions.¹⁴
• Advanced Diagnostics: Supports the GE Control Systems Toolbox for remote configuration, online monitoring, and firmware upgrades via its communication ports.¹⁵

Application Areas and Use Cases

The GE IS200ACLEH1A is indispensable in:

• Excitation Control Systems (EX2100): Primary controller for critical generator functions like AVR, PSS, and limiters.¹⁶
• Gas and Steam Turbine Controls (Mark VI): Used as the main processor for speed governing, protection, and sequencing in some configurations.
• Industrial Drive Systems: Used as a master controller in large Innovation Series drive systems.¹⁷

Competitive Comparison

The GE IS200ACLEH1A is the central processing unit within its ecosystem, competing with CPUs from other high-end industrial control platforms:¹⁸

Selection Advice

You should select the GE IS200ACLEH1A Application Control Layer Module when:

1. You are performing maintenance, repair, or planned upgrade within a GE Mark VI or EX2100 control system that requires the ACLE function.
2. The system integrity and deterministic control require the specialized hardware and real-time operating system provided by this specific GE module for its control and protection functions.
3. You are replacing a failed central processing unit and must ensure the replacement’s hardware and firmware are compatible with the existing system architecture.

Important Considerations

• Revision Match is Crucial: The full part number, particularly the H1A suffix, is vital. Always verify that the replacement module’s revision matches the one being replaced to ensure software and hardware compatibility.
• Firmware and Configuration: The ACLE requires the correct application code and configuration (Pcode) to be loaded via the GE Control Systems Toolbox upon installation.¹⁹
• Legacy Status: While the EX2100 is still active, the Mark VI is a mature platform. Maintain an adequate inventory of spares and check the current lifecycle status for long-term planning.