IS215ACLEH1B: The ACLE Master Controller Inside GE EX2100 Excitation

The IS215ACLEH1B is the Application Control Layer (ACLE) module that acts as the microprocessor-based master controller in General Electric EX2100 and EX2100e excitation control systems. It shares the IS200/IS215 hardware platform and toolbox environment used across the GE Speedtronic Mark VI family, but its job is specific: it is the processor board of the exciter and voltage regulator, not the turbine sequencer. This listing is for an IS215ACLEH1B card supplied at the H1BC revision level.

What the ACLE Actually Does

Running the QNX operating system, the ACLE executes the excitation control block-ware that regulates generator field current, working alongside the DSPX signal-processor board that handles thyristor gate firing. Its core responsibilities include:

• Hosting the control block-ware language and library that implement the regulator logic.
• Loading and validating the online application configuration each time the rack is powered up.
• Managing internal Boolean forcing and I/O points for commissioning and test.
• Examining run and start permissives and flagging the ones that fail.
• Raising application-level alarms and providing the toolbox interface over Ethernet.
• Storing its configuration in non-volatile compact flash so settings survive a power cycle.

Where the ACLE Sits in the Rack

The module occupies two slots and plugs into the standard EX2100 control racks: the simplex thyristor control rack with an IS200ESBP backplane, the IS200EBKP warm-backup thyristor control rack, the simplex regulator rack with an IS200ERBP backplane, and the redundant regulator rack with an IS200ERRB backplane. Across the backplane it exchanges data with the IS200DSPXH1 digital signal processor (DSPX) board through 32-bit dual-port RAM. Physically it is a sealed assembly — an IS200ACLE carrier board carrying a plug-in PC/104-Plus processor board — and GE's guidance is to replace the complete module rather than open it, which avoids the software and compatibility problems that come from mixing sub-boards.

Diagnose Before You Buy: Is It Really the ACLE?

A tripped regulator or an exciter that will not come online often points suspicion at the ACLE when the real fault sits somewhere cheaper to fix. Work through these before you commit to a replacement controller:

• Application and runtime code. The ACLE validates its toolbox configuration against the hardware at power-up. A failed or partial runtime download, a mismatched configuration, or corrupted compact-flash contents can make a perfectly good board look dead. Re-download the application over the ENET1 port with the toolbox first.
• The DSPX partner board. Because the ACLE and the IS200DSPXH1 DSPX share the regulation and firing task across dual-port RAM, a DSPX or gate-firing fault can surface as an alarm that appears to originate in the ACLE.
• Rack power and backplane. Confirm the EX2100 supply rails and inspect the ESBP, ERBP, ERRB or EBKP backplane for bent pins or a seating problem before assuming the processor failed.
• The toolbox link. A COM or Ethernet communications fault can mimic a hung controller. Verify the connection — the optional GE serial cable 336A3582P1 links a PC COM port to the ACLE — before condemning the card.
• Downstream field faults. Thyristor bridge problems, blown fuses, or field faults can trip the regulator from below. In those cases the ACLE is only the messenger.

Ruling these out first is the difference between a quick recovery and an expensive swap that changes nothing.

Reading the IS215ACLEH1B Part Number

IS215 marks the Mark VI / IS200-generation special assembly. ACLE is the functional acronym — Application Control Layer, the module that superseded the earlier ACLA in EX2100 systems. H1B identifies the hardware variant, and the trailing characters, H1BC in this case, track successive functional and artwork revisions. Revisions are usually backward compatible within a variant, but processor and memory content has changed across ACLE builds, so the safe practice is to match the full suffix printed on your board's label. Our GE Speedtronic Part Number Decoder breaks down each segment.

Related Boards and Where to Look Next

Parts you may need alongside this controller include the IS200DSPXH1 DSPX signal-processor board, the EX2100 backplanes listed above, and the ACLA module the ACLE replaces. Browse adjacent GE control hardware in our GE Mark VI IS200 Boards and GE Speedtronic Turbine Control Boards collections.

Request a Quote for the IS215ACLEH1B

To make sure you receive the correct card the first time, send us the full part number and suffix (IS215ACLEH1B / H1BC), the revision, a clear photo of the board label, the EX2100 or EX2100e system and the generator or turbine it serves, the ControlST or toolbox version if you know it, the quantity you need, and how urgently you need it. The GE reference manual for this module is GEI-100584.

Tell us what you are running and we will respond within 24 hours. We ship worldwide on DDP terms and welcome purchase orders from qualified facilities.