Factory-Packaged DS200ACNAG1ADD ARCNET Board

This DS200ACNAG1ADD is a new-surplus GE SPEEDTRONIC Mark V ARCNET board supplied in original factory packaging with warranty. In GE's DS200 scheme the function code ACNA denotes the Attached Resource Computer Network connection card — a communications board, not a control board. Because communication faults can idle a healthy turbine, a sealed spare on the shelf is cheap insurance against a Stage Link problem.

The card presents two connectors for LAN communications and a single 6-pin connector. Its purpose is simply to connect a Mark V processor onto the ARCNET network reliably.

The Card's Role on the Stage Link

Mark V uses ARCNET — a deterministic, token-passing local-area network — for panel communications. The best-known ARCNET link in the system is the Stage Link, which connects the common core <C> in the control panel to the operator interface <I>. Per GE's documentation, the Stage Link is a coaxial bus terminated at each end, with each processor tapping in through a "T" connector so the cable can carry on to the next station. The ACNA is the board that makes that tap-in on the panel side. Where exactly your particular card connects is best verified against the unit's network and elementary drawings, since ARCNET is used in more than one place. A wider tour of the boards is in GE Mark V DS200 Boards Explained.

Diagnose the Network Before Replacing the Card

Loss-of-comms symptoms — a processor missing from the <I> screen, intermittent Stage Link errors, a station that will not join the network — point at the whole ARCNET segment, not just this board. Because it is a shared bus, one weak point affects everyone on the wire. Check in this order:

• Cable and terminators. Confirm both end-of-line terminators are present and correct and that the coax and "T" taps are sound. This is the single most common cause of ARCNET trouble.
• Other nodes. A fault at the operator interface card or at another processor's connection can look identical to a fault here.
• Configuration. Verify the node address and setup; a conflict keeps a station off the bus regardless of board health.
• Power and driver board. Confirm supply voltage to the card and review the associated communication/driver hardware (such as the DS200STCA) before swapping the ACNA.

Only after the passive media and the far end are cleared does replacing the connection card make sense.

Part-Number Breakdown

DS200 = Mark V DS200 board series; ACNA = ARCNET Connection function; G1 = functional group; A = functional revision; DD = board artwork/hardware revision. Always quote the complete string, because the trailing letters separate this build from ABB, ACC and other G1A variants. The GE Speedtronic Part Number Decoder steps through the format in detail.

Related Mark V Communication Hardware

Keep the wider communication path in view: the ARCNET coax and terminators, the operator interface and its ARCNET card, and panel communication boards such as the DS200STCA. For sites considering a control-system refresh, the successor Mark VI (IS200) platform is covered in Mark V vs Mark VI: DS200 to IS200. The full Mark V range is at GE Mark V DS200 Boards, with the broader control-board catalogue at GE Speedtronic Turbine Control Boards.

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