What DS200SLCCG1AGH Does and Where It Lives

DS200SLCCG1AGH is an SLCC – a LAN Communication Card – used in GE's Speedtronic Mark V turbine control system (the same card family is also used in EX2000 excitation cabinets). Its job is to process and filter incoming LAN communication signals between the Mark V's control processors and the rest of the system, using both isolated and non-isolated circuits. The card's main component is its LAN Control Processor (LCP, at position U1), with LCP software held in two replaceable EPROMs (U6/U7) and dedicated RAM at U8/U9. A dual-ported RAM (U5) lets the LCP talk to the drive control processor on the companion SDCC card over connector 3PL. An attachable alphanumeric keypad/display module plugs into the SLCC for diagnostics, configuration, and fault-code readout.

Physically, the SLCC is part of the card set documented in the Mark V's <C> (communication) core, and it connects to the NTB/3TB, SDCC, TCCB, and DCFB boards through a 2PL connector. This is a G1-group card – the earliest SLCC grouping, which includes both DLAN and ARCNET network adaptation circuitry (later G4-group SLCC cards dropped this circuitry entirely, so an SLCC group isn't just a revision number – it can reflect real differences in what network hardware the card supports).

Diagnose Before You Buy: The SLCC Is Often Not the Problem

This is the part most sellers skip, and it matters here more than on almost any other Mark V card, because SLCC symptoms are notoriously easy to misdiagnose. A well-documented Mark V field case describes a turbine running with the operator interface no longer updating live data – a classic "bad SLCC" symptom. In that case, the site replaced every card in the <C> core, including the SLCC, TCCA, SDCC, and TCDA, plus the TCPS power supply card – and the fault did not go away. Experienced responders pointed troubleshooting toward:

• Power supply voltages at the test points on the <R> and <C> processor power cards, checked against the limits published in the Mark V Maintenance Manual (GEH-5980)
• What data is visible through the BOI (the panel's backup operator interface, which talks directly to the <R> processor without going through the <C> core) – this helps isolate whether the fault is really in the communication path rather than in <R> itself
• Corrosion on connector pins or a broken wire, rather than a card fault
• The TCQC card, which handles internal Mark V core-to-core communication – in position 4 of the <R> core, it links to the <C> core's SLCC over the ARCPL cable, and a bad TCQC or a damaged ribbon cable between the two cores can produce the exact same symptoms as a bad SLCC

There's also a useful rule buried in GE's own maintenance documentation: every card in a processor core has to individually reach I/O status A6 before the whole core can move on to A7. If your <C> core is stuck at A5 or A6, check which specific card is holding it back before assuming the SLCC is the one at fault – it may be the SDCC, TCCA, or IOMA card in the same core instead.

Reading This Part Number

Breaking down DS200SLCCG1AGH: DS200 is the Mark V-era board series prefix, SLCC is the LAN Communication Card functional acronym, G1 is the product grouping (the earliest SLCC group, carrying both DLAN and ARCNET circuitry), and GH encodes this unit's specific functional and artwork revision levels. Because network circuitry has actually changed across SLCC groups – G1 and G2 include DLAN/ARCNET adaptation circuits that later G4-group cards do not – don't assume every SLCC group is a drop-in replacement for another. Match the complete part number against your system documentation and the label on the card you're replacing.

Related Boards and the Move to Mark VI

Inside the <C> core, the SLCC is normally discussed alongside TCCA, SDCC, IOMA, TCDA, and the TCQC card that links <C> back to <R>. If your site is planning a longer-term platform change, GE's Mark VI system replaced the DS200 board series with IS200-series hardware and a different communications architecture; see our Mark V vs Mark VI: DS200 to IS200 guide for the general picture. For how GE's Speedtronic part numbers are structured, see the GE Speedtronic Part Number Decoder, and for context on the DS200 board family overall, see GE Mark V DS200 Boards Explained.

What to Send With Your Quote Request

• The complete part number and suffix, e.g., DS200SLCCG1AGH
• A photo of the label, if possible
• Turbine model and whether the panel is Mark V or EX2000
• Quantity needed
• Urgency – planned outage or active fault

Request a Quote

This DS200SLCCG1AGH 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 our team will respond 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	DS200SLCCG1A By General Electric DS200SLCCG1AGH LAN Communication Card Mark V
Condition	used Clean and Tested. With 1 Year Warranty.