DS200SLCCG3AFG: LAN Communication Card

DS200SLCCG3AFG is a G3-group SLCC, the LAN Communication Card GE uses in the Speedtronic Mark V turbine control system (the same card family also appears in EX2000 excitation cabinets). The SLCC's role is to process and filter incoming LAN communication signals through a mix of isolated and non-isolated circuits, centered on a LAN Control Processor (LCP, U1) whose software is held in two replaceable EPROMs (U6/U7) backed by dedicated RAM (U8/U9). A dual-ported RAM at U5 lets the LCP communicate with the drive control processor on the companion SDCC card over connector 3PL, and an attachable alphanumeric keypad/display module provides on-card diagnostics and fault-code readout.

The SLCC is documented as part of the Mark V's <C> (communication) core card set, connecting to the NTB/3TB, SDCC, TCCB, and DCFB boards via a 2PL connector. GE's SLCC lineage runs from G1 through at least G4; the earlier G1/G2 groups carried DLAN and ARCNET network adaptation circuitry that the later G4 group removed entirely, so the group letter reflects a real hardware difference, not just a cosmetic revision.

Diagnose Before You Buy: SLCC Faults Are Easy to Misdiagnose

An SLCC-shaped symptom – the operator display freezing, data no longer updating – is one of the most commonly misdiagnosed faults on a Mark V panel, and it's worth understanding why before you order a replacement. In one documented field case, a turbine's operator interface stopped updating live data, and the site replaced every card in the <C> core – SLCC, TCCA, SDCC, TCDA – along with the TCPS power supply, and the fault persisted. The troubleshooting that eventually helped pointed at:

• Power supply voltages at the <R> and <C> processor test points, checked against the Mark V Maintenance Manual (GEH-5980) limits
• The BOI (backup operator interface), which talks directly to <R> without routing through <C> – a useful way to isolate whether the problem is really communications-related
• Corroded connector pins or a broken wire, rather than a card defect
• The TCQC card in the <R> core and its ARCPL cable link to the <C> core's SLCC – a fault here reproduces SLCC-like symptoms exactly

Also keep in mind that a processor core only reaches I/O status A7 once every card in that core individually reaches A6 first – so before condemning the SLCC, check the status of each card in the <C> core rather than assuming the SLCC is the one holding things back.

What G3AFG Tells You

DS200 is the Mark V-era board series prefix, SLCC is the LAN Communication Card acronym, G3 is this board's product grouping, and AFG is the specific functional and artwork revision combination of this unit. We can confirm that GE changed SLCC network circuitry across groups – G1/G2 included DLAN and ARCNET adaptation hardware that G4 removed – so treat the group letter as a real hardware distinction and match it to your system documentation rather than assuming interchangeability across groups.

Related Boards and the Path to Mark VI

Inside the <C> core, the SLCC works alongside TCCA, SDCC, IOMA, TCDA, and the TCQC card that links back to the <R> core. For plants considering 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 how GE's Speedtronic part numbers are built, 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 for a Quote

• The complete part number and suffix, e.g., DS200SLCCG3AFG
• A photo of the label
• Turbine model, and whether the panel is Mark V or EX2000
• Quantity
• Urgency – planned outage or active fault

Request a Quote

This DS200SLCCG3AFG is new-surplus, open-box stock with a 1-year warranty (see below). Pricing isn't published online since Mark V board quotes depend on exact revision match and current availability – 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	DS200SLCCG3A Mark V DS200
Description	DS200SLCCG3A General Electric DS200SLCCG3AFG LAN Communication PC Board NSNB
Condition	newSurplusNoBox With 1 Year Warranty.