IS200ACLEH1A - Application Control Layer Module

IS200ACLEH1A - Application Control Layer Module IS200ACLEH1A - Application Control Layer Module

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Part No: IS200ACLEH1A
Manufacturer: General Electric
Product Type: Application Control Layer Module
Series: EX2100
Availability: In Stock
Country of Manufacture: United States(USA)
Weight: 2.90 lbs
Manual: GEI 100434A

Functioanl Description

IS200ACLEH1A is an Application Control Layer Module manufactured by General Electric. It is part of EX2100 control systems. It's a microprocessor-based master controller that handles multiple tasks over communication networks like EthernetTM and ISBus. The ACL fits into two half-slots in a standard Innovation Series drive or EX2100 exciter board rack. The control cabinet houses the ACL and the board rack. The P1 connector (4-row 128-pin) plugs into the Control Assembly Backplane Board in drive applications (CABP). The ACL in the EX2100 exciter is mounted in the Exciter Backplane (EBKP).

Hardware Features

Integrated circuit features

The ACL's integrated circuits provide the following features:

  • Central processing unit (CPU)
  • Peripheral component interconnect (PCI) controller
  • Level 2 cache of 128 Kbytes
  • 8 MB of dynamic random access memory (DRAM)
  • 4 MB of flash memory basic I/O system (BIOS)
  • High-speed Ethernet
  • Bus target interface
  • COM1 and COM2 serial ports
  • Ethernet
  • ISBus communication ports


  • The CPU has a 16 K byte internal L1 cache.
  • It is a 486 processor that runs at 100 MHz.

PCI controller

  • All memory, I/O, and configuration transfers to and from the PCI bus are managed by the PCI controller. Memory and I/O transfers are normal CPU reads and writes.
  • Configuration reads/writes must be accessed as 32-bit transfers by first writing the configuration address to an I/O port and then reading/writing the configuration register from another I/O port.

128 KB Level 2 (L2) Cache

  • The PCI controller manages the 128 KB Level 2 (L2) cache.
  • The L2 cache is configured to generate 152 Ns cache line fills between the L2 and L1 caches.


The BIOS is a 1 MB (128 KB x 8) 5 V flash memory device that mounts in an ACL socket. If no video BIOS is found (if no PC/104 VGA board is installed), the BIOS will redirect the video display to COM1. There are three sections in the flash memory BIOS:

  • Primary BIOS
  • BIOS configuration utility
  • GE Industrial Systems Extended BIOS

PCI/ISA Bridge

The PCI/ISA Bridge connects to the PCI controller via the CPU Address and LINK buses and controls the following functions:

  • ISA bus control logic
  • Interrupt routing from IRQ to PCI
  • System clock generator

Reset Switch Logic

  • The RESET switch, located directly below the top ejector on the ACL faceplate, connects the Reset Switch Logic.

PC Compatible interface

It manages the compatible interface, which performs the following functions:

  • Keyboard and speaker control logic
  • Two programmable interrupt controllers
  • Real Time Clock (RTC)
  • Two DMA controllers
  • One programmable interval controller
  • Interrupt control logic for system management
  • Advanced power management control logic
  • Power management unit control logic

Software Features

The hardware is identified and initialized by the Basic Input/Output System (BIOS). The BIOS directs all output display information to the COM1 serial port during initialization. During the initial boot sequence, the BIOS also supports serial loading of the operating system (compatible with the current GE loader) via the COM1 port. The GE extended BIOS handles the following tasks:

  • Overwrites the boot interrupt to point to GE's extended BIOS
  • Displays the CMOS settings via the COM1 serial port (accessible via the toolbox and setup utility)
  • Supports an RS-232C download
  • Initializes any GE-specific hardware
  • Resets the ACL_ through RESDRV when needed via an I/O write
  • Enables flash disk support and booting

Connector Pin Signals

To access individual pin signals on the ACLA board backplane connector P1, a custom extender board is required. These signals are not checked as part of standard in-service testing/troubleshooting procedures, and they are not described in this publication. PC/104 header signals are not defined either. The ACL faceplate contains user connectors. The following tables define the pin signals for these connectors:

  • Table Connector
  • 5 COM1/2 Interface Connectors
  • 6 P3 Ethernet Interface Connector
  • 7 ISBus Connectors

GE Control Systems Toolbox

  • The toolbox is used to configure the ACL's runtime actions. It specifies and records all application code configuration information in a binary format known as Pcode. The toolbox saves Pcode to the ACL in either volatile or permanent (Flash) memory.
  • It is also used to monitor and change parameters online, as well as to make minor code changes. Over Ethernet, the toolbox upgrades the most recent product code firmware, such as block libraries, schedulers, and others. The Serial Loader is used to upgrade the ACL operating system. Instead of replacing the EPROM, this firmware is loaded into the ACL's flash memory via a serial cable.
  • The Serial Loader also configures ACL's TCP/IP address, allowing for additional communication with the toolbox via Ethernet.

WOC has the largest stock of GE Excitation control spare parts . Our team of experts at WOC is happy to assist you with any of your automation requirements. Please contact our staff by phone or email for pricing and availability on any parts and repairs.



What is IS200ACLEH1A?
It is an Application Control Layer Module manufactured by General Electric

What is The function of ACLEH1A?
Application Control Layer Module is a microprocessor-based master controller used to perform multiple duties over communication networks such as EthernetTM and ISBus.

Why is DC utilized as a source of excitation?
To create a static magnetic field, an excitation voltage or current is applied to the field windings of a rotor.