DS200SLCCG1AAA and the Mark V Communication Core

If a Mark V panel loses its LAN-level communication, the card responsible for that link is the SLCC, and DS200SLCCG1AAA is a G1-group unit – the earliest SLCC grouping. Its job is to process and filter incoming LAN communication signals through isolated and non-isolated circuits, built around a LAN Control Processor (LCP, at U1) whose software sits in two replaceable EPROMs (U6/U7) with dedicated RAM at U8/U9. A dual-ported RAM at U5 lets the LCP exchange data with the drive control processor on the SDCC card via connector 3PL, and an attachable alphanumeric keypad/display module gives on-card access to diagnostics and fault codes.

The SLCC is part of the documented card set in the Mark V's <C> (communication) core, connecting to the NTB/3TB, SDCC, TCCB, and DCFB boards through a 2PL connector. Being a G1-group card, it includes the DLAN and ARCNET network adaptation circuitry that GE later removed entirely from the G4 group – a functional difference, not a cosmetic one.

Why the SLCC Gets Blamed for Faults It Didn't Cause

Before ordering a replacement SLCC, it's worth knowing how often this exact card gets swapped unnecessarily. A well-documented Mark V case involved an operator interface that stopped updating live data – textbook "bad SLCC" territory. The site replaced every card in the <C> core (SLCC, TCCA, SDCC, TCDA) plus the TCPS power supply, and the fault didn't clear. What experienced troubleshooters recommended instead:

• Verify power supply voltages at the <R> and <C> test points against the limits in the Mark V Maintenance Manual (GEH-5980)
• Use the BOI (backup operator interface) to see what data is reaching it directly from <R>, bypassing <C> entirely – this helps confirm whether the fault is really in the comms path
• Check for connector corrosion or a broken cable conductor before assuming a card is bad
• Consider the TCQC card in the <R> core, which links to the <C> core's SLCC via the ARCPL cable – a fault here reproduces SLCC symptoms exactly, even with a healthy SLCC installed

One more diagnostic point worth knowing: a processor core only reaches I/O status A7 once every card inside it individually reaches A6. If your <C> core won't progress, identify which specific card is stuck before assuming it's the SLCC – it could just as easily be the SDCC, TCCA, or IOMA sharing that core.

Reading DS200SLCCG1AAA

DS200 is the Mark V-era board series prefix, SLCC is the LAN Communication Card acronym, G1 is the product grouping (carrying DLAN and ARCNET circuitry that later groups dropped), and AAA is the specific functional and artwork revision combination of this unit. Because SLCC groups reflect genuine hardware differences rather than a simple sequence, always confirm the exact group and suffix against your system documentation before ordering.

Related Boards and Longer-Term Migration

Within the <C> core, the SLCC is typically discussed with TCCA, SDCC, IOMA, TCDA, and the TCQC card linking to <R>. If your facility is planning a move away from Mark V, GE's Mark VI platform 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 GE's Speedtronic part-numbering logic, see the GE Speedtronic Part Number Decoder, and for the SLCC's place among other DS200 boards, see GE Mark V DS200 Boards Explained.

What to Send With Your Quote Request

• The complete part number and suffix, e.g., DS200SLCCG1AAA
• A photo of the label
• Turbine model and whether the system is Mark V or EX2000
• Quantity needed
• Urgency – planned outage or active fault

Request a Quote

This DS200SLCCG1AAA is offered used, clean and tested, with a 1-year warranty (see below). Pricing isn't published online 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	DS200SLCCG1A Mark V DS200
Description	GE DS200SLCCG1A DS200SLCCG1AAA LAN Communication Card Mark V
Condition	used Clean and Tested. With 1 Year Warranty.