IS200ACLEH1A is an Arg application control layer module used in the EX2100 excitation system. Before upgrading to a higher level of IS215, the IS200 version of ACLE instead of IS215 was the base level board. IS200ACLEH1A, commonly known by ACLE, is a microprocessor based main controller designed to perform multiple tasks simultaneously through an Ethernet communication network. All software and configuration tasks of IS200ACLEH1A require the use of the GE Control System Toolbox to control the EX2100 excitation system.

IS200ACLEH1A has a wide panel with the manufacturer’s logo and plate number printed on it. Due to the wide panel, the module occupies two slots in the EX2100 excitation control system rack. The board components of IS200ACLEH1A are also marked with the board number and GE logo. It has code 6BA01 printed on one side of the PCB. Car mounted components tend to be identified by reference codes in General Electric manuals, such as GEI-100584A.

IS200ACLEH1A has several board connectors, including the vertical pin connector in the upper right corner, the backplane connector located at the back edge of the board, and the multi pin ribbon cable connector. The ribbon connector is connected to the auxiliary board, which occupies most of the middle of the board. This auxiliary board has many components, including multi pin connectors and integrated circuits. The motherboard also has an IDE to SATA converter, which can accommodate 128 MB of cards.

The panel of the ACLE module has easily recognizable status LEDs. These status indicators include: normal (watchdog timer enabled), active (microprocessor access to memory), ENET (Ethernet active), and flashing (flash write operation in progress).