DS200ACNAG1ACC: ARCNET (Attached Resource Computer Network) Card

The DS200ACNAG1ACC is a GE SPEEDTRONIC Mark V ARCNET Connection Card, here in the G1ACC revision and offered as new-surplus, open-box hardware with warranty. The four-letter DS200 function code ACNA is short for Attached Resource Computer Network — the LAN technology this board connects to. In other words, it is a communications card: it links a Mark V processor to the ARCNET network that carries data around the control system, and it plays no part in the turbine's control or protection logic.

Physically it is a compact board with two connectors for LAN communications and one 6-pin connector.

Why the Board Carries the ARCNET Name

ARCNET (Attached Resource Computer Network) is a token-passing local-area network, and GE built Mark V communications around it. The most recognisable ARCNET link is the Stage Link, which connects the common core <C> in the turbine control panel to the operator interface <I> so data, alarms and commands can move between them. GE documents that link as a coaxial bus terminated at both ends, with each processor connecting through a "T" tap so the run continues to the next node. The ACNA supplies that connection at the board level. As ARCNET appears in more than one place in the system, use your network and elementary drawings to confirm the exact role of a given card. The layout is explained in GE Mark V DS200 Boards Explained.

Before You Buy: Isolate the Real Fault

The most useful thing to do before buying a communications card is to prove the card is actually the problem. ARCNET is a shared bus, and its faults love to hide in the wiring:

• Terminators and coax. A missing or wrong end-of-line terminator, or a damaged coax or "T" tap, can bring down the whole segment — check these before anything else.
• The opposite end. A defective ARCNET card in the operator interface or another processor gives the same "lost communication" symptom as a local fault.
• Node setup. An address conflict or configuration mistake drops a station off the bus with the hardware perfectly healthy.
• Power and driver board. Confirm the card has power and review the companion communication/driver hardware (such as the DS200STCA) before deciding the ACNA has failed.

Once the passive media, the far end and the configuration are cleared, a new-surplus ACC card is a clean way to restore the node.

Decoding the DS200ACNAG1ACC Suffix

Read the number as DS200 (Mark V DS200 board series) + ACNA (ARCNET Connection function) + G1 (functional group) + A (functional revision) + CC (board artwork/hardware revision). The trailing letters are what separate the ACC build from the ABB and ADD versions, so match the full string to your installed card and drawings. The GE Speedtronic Part Number Decoder walks through the whole format.

Related Boards in the Mark V Comm Path

The rest of the communication chain includes the ARCNET coax and terminators, the operator interface's ARCNET card, and Mark V communication boards such as the DS200STCA. If a future control-system upgrade is on the table, the Mark VI (IS200) platform is the successor generation — Mark V vs Mark VI: DS200 to IS200 outlines what changed. Browse the range at GE Mark V DS200 Boards and the wider GE Speedtronic Turbine Control Boards.

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