DS200SLCCG2AGH: LAN Communication for Mark V and EX2000

DS200SLCCG2AGH is a G2-group SLCC – GE's LAN Communication Card for the Speedtronic Mark V turbine control system, also used in EX2000 excitation cabinets. Its function is to process and filter incoming LAN communication signals using isolated and non-isolated circuits, built around a LAN Control Processor (LCP, U1) whose software lives in two replaceable EPROMs (U6/U7) with dedicated RAM at U8/U9. 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 technicians access to configuration and fault-code readout.

This card 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. As a G2-group SLCC, it carries network adaptation circuitry from the earlier SLCC design – later G4-group SLCC cards dropped that circuitry entirely, which is why the SLCC's group letter is a functional distinction, not just a cosmetic revision marker.

Before You Buy: Understand What Actually Causes SLCC-Type Faults

Symptoms that look like a bad SLCC – a frozen operator display, data that stops updating – are some of the most commonly misdiagnosed faults on a Mark V panel. In one well-documented case, an operator interface stopped updating live data, and the site methodically replaced every card in the <C> core – SLCC, TCCA, SDCC, TCDA – plus the TCPS power supply, and the fault remained. The troubleshooting guidance that followed pointed toward causes outside the SLCC itself:

• Power supply voltages at the <R> and <C> processor test points, checked against the limits in the Mark V Maintenance Manual (GEH-5980)
• The BOI (backup operator interface), which communicates directly with the <R> processor without going through <C> – useful for isolating whether the fault is really in communications or in <R> itself
• Connector corrosion or a broken wire, rather than a defective card
• The TCQC card in the <R> core, which handles internal core-to-core communication and links to the <C> core's SLCC over the ARCPL cable – a fault here or in the cable itself can mimic a bad SLCC exactly

It's also worth remembering that a processor core only reaches I/O status A7 once every card in it has individually reached A6 – so if your <C> core is stuck below A7, identify which specific card is the holdout before assuming it's the SLCC.

Understanding the DS200SLCCG2AGH Part Number

DS200 is the Mark V-era board series prefix, SLCC is the LAN Communication Card acronym, G2 is this board's product grouping, and GH is the specific functional and artwork revision combination carried by this unit. SLCC groups aren't purely sequential revisions – the network adaptation circuitry present in G1/G2 cards was removed entirely in the later G4 group – so always match the full part number to your system documentation rather than assuming any SLCC will do.

Related Boards and Longer-Term Alternatives

Within the <C> core, the SLCC is typically discussed alongside TCCA, SDCC, IOMA, TCDA, and the TCQC card linking back to <R>. For sites weighing a 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 general picture. For the logic behind GE's part-numbering system, see the GE Speedtronic Part Number Decoder, and for how the SLCC compares with other DS200 boards, see GE Mark V DS200 Boards Explained.

What to Include in Your Quote Request

• The full part number and suffix, e.g., DS200SLCCG2AGH
• A photo of the label, if you have one
• Turbine model and whether it's a Mark V or EX2000 panel
• Quantity needed
• Urgency – scheduled outage or unplanned downtime

Request a Quote

This DS200SLCCG2AGH is new-surplus, factory-packaged stock with a 1-year warranty (see below). We don't publish prices online since Mark V board quotes depend on exact revision availability – 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	DS200SLCCG2A Mark V DS200
Description	DS200SLCCG2A by GE DS200SLCCG2AGH Mark V DS200 New Surplus Factory Package
Condition	newSurplusFactoryPackage Cleaned and Tested. With 1 Year Warranty.