GE IS200ACLAH1A Application Control Layer Module

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GE IS200ACLAH1A Application Control Layer Module, which is a core component within GE’s industrial control systems.

The search results confirm that the GE IS200ACLAH1A is a critical board, part of the Mark VI Speedtronic Turbine Control System and its related series like the EX2100 Excitation Control.¹ The functional acronym, ACLA, stands for Application Control Layer Module.²

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Product Description

The GE IS200ACLAH1A Application Control Layer Module (ACLA) is a microprocessor-based master controller designed by General Electric for its high-performance Mark VI Turbine Control System.³ It functions as the central computing engine for the control system, managing the execution of the main application software, handling complex control algorithms, and overseeing system-level communication.

The ACLA module is where the application-specific code (Blockware language) resides and executes, often at rates critical for real-time turbine control (e.g., ⁴$10 \text{ ms}$ or ⁵$20 \text{ ms}$).⁶ It is essential for managing communication networks, including Ethernet and proprietary buses like ISBus or IONet, which connect the ACLA to the I/O processing boards and other system modules.⁷ The GE IS200ACLAH1A (Placeholder Link: GE Automation Solutions Product Page) typically operates on a real-time, pre-emptive multi-tasking operating system (like QNX) to ensure deterministic control action. This board is often installed in a VME card rack, occupying one or two slots, and is protected by a conformal coating.⁸ The GE IS200ACLAH1A (Placeholder Link: GE Automation Solutions Product Page) is fundamental to the system’s performance, stability, and control execution. The GE IS200ACLAH1A (Placeholder Link: GE Automation Solutions Product Page is often used in both turbine control and drive applications, such as the EX2100 Excitation control.

Product Parameters

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

• Manufacturer/Series: General Electric, Mark VI Speedtronic Control System.⁹
• Product Type: Application Control Layer Module (ACLA).¹⁰
• Processor: Often utilizes an Intel 486-class processor running at ¹¹$100 \text{ MHz}$ (or similar embedded CPU, depending on revision).¹²
• Operating System: Real-time operating system (e.g., QNX-based) supporting pre-emptive multi-tasking.¹³
• Memory: Typically includes DRAM (Dynamic Random Access Memory) for application execution and Flash memory for the BIOS and operating system.¹⁴
• Communication Ports: Includes an Ethernet port (¹⁵$10 \text{BaseT}$ or ¹⁶$10/100 \text{ Mbps}$), at least two ¹⁷$\text{RS-232C}$ serial ports (¹⁸$\text{COM1}$ and ¹⁹$\text{COM2}$), and potentially proprietary bus interfaces (ISBus/IONet) depending on the exact model variant.²⁰
• System Interface: Plugs into a standard VME or specialized GE backplane (e.g., the Control Assembly Backplane Board or Exciter Backplane).²¹
• Coatings: Conformal Coated for environmental protection.²²

Advantages and Features

• Deterministic Control: Executes application software on a real-time OS, guaranteeing precise timing for control loops, which is critical for turbine stability and protection.
• High Integration: Serves as the central hub for the entire control system, managing data from all I/O boards (via IONet/ISBus) and communicating with plant-level systems (via Ethernet/serial ports).
• Robust Operating System: Utilizes the reliable QNX platform, known for its stability and suitability in demanding industrial and mission-critical applications.²³
• Comprehensive Diagnostics: Includes on-board LEDs for status, processor activity, and network communication, and supports the GE Control Systems Toolbox for detailed configuration, online monitoring, and software upgrades.²⁴

Application Areas and Use Cases

The GE IS200ACLAH1A is indispensable in:

• Gas and Steam Turbine Controls (Mark VI): Acts as the main processor for governing, protection, and sequencing of the turbine.
• Excitation Control Systems (EX2100): Often serves as the primary control and communication module for managing Automatic Voltage Regulators (AVR) and Power System Stabilizers (PSS).²⁵
• High-Speed Drive Applications: Used in the control racks of large industrial drives (Innovation Series) requiring precise speed and torque control.²⁶

Competitive Comparison

The GE IS200ACLAH1A competes as the central processing unit within its proprietary control ecosystem, competing with CPUs from other high-end industrial control platforms:²⁷

Selection Advice

You should select the GE IS200ACLAH1A Application Control Layer Module when:

1. You are performing maintenance, repair, or upgrade within a GE Mark VI or EX2100 control system that requires the ACLA function.
2. The system integrity and deterministic control require the specialized hardware and real-time operating system provided by this specific GE module.
3. You need the central computing engine for application execution, I/O management, and overall system communication.

Important Considerations

• Revision Match: The full part number, particularly the H1A suffix, specifies the hardware revision and configuration.²⁸ Always verify that the replacement module’s revision matches the one being replaced to ensure software and hardware compatibility.
• Firmware and Configuration: The module’s performance is tied to the loaded application firmware. Ensure the correct version of the application code and configuration is loaded onto the ACLA using the GE Control Systems Toolbox.
• Sparing Strategy: Due to the module’s critical role and its status within a legacy (Mark VI) or mature (EX2100) platform, maintain an adequate inventory of spares and check the current lifecycle status.