Why a "Blank" Board Still Needs to Power Up Correctly

Look at the faceplate of an IS200BICLH1B and there's almost nothing on it — two mounting brackets, one label. The intelligence is inside: control logic for this Bridge Interface Module runs on an onboard EPLD (electronically programmable logic device), and that EPLD is configured by the EX2100 exciter's main CPU every time the system powers up or is hard-reset. A 1024-bit serial memory on the board stores its own identification and revision data so the system knows what it's talking to. If a freshly installed board doesn't behave, a failed or incomplete configuration cycle at power-up is worth checking before assuming the hardware itself is bad.

What It Connects and Why It's Called a "Bridge" Interface

This board is the link between the EX2100 excitation control system's main regulator board and the Bridge Personality Interface boards — BPIA, BPIB, or SCNV — that connect directly to the IGBT power bridge controlling generator field current. It's not a network bridge and it's not part of Mark VI turbine control logic, despite carrying the same IS200 numbering convention as Mark VI boards. Firing commands go out through it; current and thermal diagnostic data comes back. It also monitors ambient and bridge temperature independently and interfaces with the cabinet's PWM-driven cooling fan and system fault display.

Symptoms That Point Elsewhere

• A bridge/IGBT fault on the HMI can originate at the power module, at the BPIA/BPIB/SCNV board, or at the BICL — don't assume it's this board just because it's in the fault path.
• Overtemperature alarms are often the fan or airflow, not the monitoring circuitry itself.
• Erratic behavior right after a swap often means an incomplete EPLD configuration cycle or a wrong installation slot, not a defective new unit.

Installation: Slot 5, Every Time

The board's single faceplate label specifies Slot 5 as the only correct installation position, because backplane connections at that slot are wired specifically for the BICL. Confirm the slot before removing power for a swap, and use standard anti-static precautions throughout.

The Part Number

IS200BICLH1B IS200BICLH1BAA: BICL identifies the board's function, H is the surface-mount technology code, and AA (following H1B) marks this specific revision. GE's reference documentation for the board is manual GEI-100264. For the complete logic behind Mark VI and EX2100 part numbers, see our part number decoder.

Boards That Usually Travel Together

A BICL is ordered alongside its matching Bridge Personality Interface board (BPIA, BPIB, or SCNV), and often alongside EACF exciter AC feedback boards elsewhere in the same EX2100 cabinet. Our Mark VI IS200 boards collection covers the wider catalog.

What to Send Us for a Quote

• Full part number and suffix (IS200BICLH1BAA), with a label photo if the revision isn't clear
• Confirmation the application is EX2100 excitation control
• Generator/turbine model and site
• Quantity and urgency

Request a Quote

This board is quoted rather than sold at checkout. Send your part number and timeline through Request a Quote and we'll respond within 24 hours with DDP pricing. Worldwide shipping, purchase orders accepted.