DS200SLCCG2AHH: Function and Placement

DS200SLCCG2AHH is a G2-group SLCC, GE's LAN Communication Card for the Speedtronic Mark V turbine control system (also used in EX2000 excitation cabinets built on the same architecture). The board processes and filters incoming LAN communication signals through isolated and non-isolated circuits, with a LAN Control Processor (LCP, U1) at its core, LCP software in two replaceable EPROMs (U6/U7), and dedicated RAM at U8/U9. A dual-ported RAM at U5 links the LCP to the drive control processor on the companion SDCC card via connector 3PL, and an attachable alphanumeric keypad/display module provides on-card diagnostics and fault-code readout.

This card is part of the Mark V's <C> (communication) core, connecting to the NTB/3TB, SDCC, TCCB, and DCFB boards through a 2PL connector. As a G2-group card, it retains network adaptation circuitry from the earlier SLCC design, circuitry that a later G4-group SLCC dropped completely – a genuine hardware distinction between groups, not just a revision counter.

What to Check Before You Assume the SLCC Has Failed

SLCC-type symptoms – a frozen operator display, data that stops updating – are among the most commonly misdiagnosed faults in a Mark V panel. One well-documented case involved exactly that symptom, and the site replaced every card in the <C> core (SLCC, TCCA, SDCC, TCDA) along with the TCPS power supply. The fault stayed. What ultimately mattered:

• Power supply voltages at the <R> and <C> test points, checked against the Mark V Maintenance Manual (GEH-5980) limits
• The BOI (backup operator interface), which talks to <R> directly, bypassing <C> entirely – a good way to confirm whether the fault is really communications-related
• Corrosion on connector pins or a broken cable conductor, checked before any card was swapped
• The TCQC card in <R> and the ARCPL cable to the <C> core's SLCC – a fault on either end of that link reproduces SLCC-like symptoms precisely

Also remember: a processor core only reaches I/O status A7 once every card inside it individually reaches A6. If the <C> core on your panel won't progress, identify the specific card holding it back before assuming it's the SLCC.

Reading DS200SLCCG2AHH

DS200 is the Mark V-era board series prefix, SLCC is the LAN Communication Card acronym, G2 is the product grouping, and HH is this unit's specific functional and artwork revision combination. Since SLCC groups map to real circuitry differences – G1/G2 include network adaptation hardware that G4 doesn't – always confirm the exact group and full suffix against your system documentation.

Related Boards and the Path Forward

Inside the <C> core, the SLCC works alongside TCCA, SDCC, IOMA, and TCDA, connecting back to <R> through the TCQC card. If your site is planning a longer-term platform change, GE's Mark VI system replaced the DS200 series with IS200-series boards and a different communications architecture; see our Mark V vs Mark VI: DS200 to IS200 guide. For the structure of GE's Speedtronic part numbers, see the GE Speedtronic Part Number Decoder, and for how the SLCC fits with other DS200 boards, see GE Mark V DS200 Boards Explained.

What to Send for a Quote

• The complete part number and suffix, e.g., DS200SLCCG2AHH
• A photo of the label
• Turbine model and whether the system is Mark V or EX2000
• Quantity
• Urgency – planned outage or active fault

Request a Quote

This DS200SLCCG2AHH is offered used, cleaned and tested, with a 1-year warranty (see below). We keep pricing off our website since Mark V board quotes depend on exact revision match and current stock – submit a Request a Quote and expect a reply within 24 hours. We ship worldwide DDP, accept purchase orders, and support both planned outages and urgent turbine-down orders.

General Information about the Product
Part Number	DS200SLCCG2A Mark V DS200
Description	GE General Electric DS200SLCCG2A DS200SLCCG2AHH LAN Communication Board Mark V
Condition	used Cleaned and Tested. With 1 Year Warranty.