DS200ACNAG1ADD ARCNET Connection Card (Used, Tested)

Supplied used, cleaned and tested with warranty, this DS200ACNAG1ADD is a GE SPEEDTRONIC Mark V ARCNET Connection Card in the G1ADD revision. The DS200 function code ACNA stands for Attached Resource Computer Network — the board's job is communications, giving a Mark V processor its physical link onto the ARCNET network that carries data across the control system.

It is a small card: two connectors for LAN communications and one 6-pin connector. That simplicity is a strength, because a tested connection card either passes traffic cleanly or it does not.

Function and Placement in the Mark V

Within the Mark V, ARCNET is the communications backbone, and its headline use is the Stage Link — the network between the common core <C> in the control panel and the operator interface <I>. GE documents the Stage Link as a coaxial bus, terminated at both ends, with each processor connecting through a "T" tap so the run can continue to the next node. The ACNA is the panel-side board that makes that connection. ARCNET is used in more than one place within the system, so verify from your network and elementary drawings which segment a given card belongs to before you plan a swap. The panel is mapped out in GE Mark V DS200 Boards Explained.

Troubleshooting Stage Link Communication

Communication faults usually announce themselves at the operator interface: a core greys out on the <I> display, the Stage Link logs errors, or a station will not come online. Tempting as it is to blame the connection card, ARCNET is a shared medium and the culprit is frequently elsewhere. Investigate the segment in this sequence:

• Start at the physical layer. Verify both end terminators and inspect the coax and "T" connectors — the majority of ARCNET faults are here.
• Test the opposite end. A bad ARCNET card in the operator interface or another processor mimics a local failure exactly.
• Review the node setup. Address conflicts or configuration errors drop a station off the bus with no hardware fault at all.
• Then the board and its neighbours. Confirm power to the card and check the companion communication/driver board (such as the DS200STCA) before deciding the ACNA is dead.

Clearing the media and the far end first is what stops a good, tested card from being swapped for nothing.

How to Read the Full Part Number

Decoded, the number is DS200 (Mark V DS200 board series) + ACNA (ARCNET Connection function) + G1 (functional group) + A (functional revision) + DD (board artwork/hardware revision). Because the trailing pair distinguishes this from ABB, ACC and other variants, always specify the whole string and check it against your drawings. The GE Speedtronic Part Number Decoder covers each element.

Cross-Generation and Related Boards

Related items in the communication chain include the ARCNET coax and terminators, the operator interface's ARCNET card, and Mark V communication boards such as the DS200STCA. Looking ahead, the Mark VI (IS200) platform succeeded Mark V; Mark V vs Mark VI: DS200 to IS200 explains how the architecture changed. See more inventory at GE Mark V DS200 Boards and the wider GE Speedtronic Turbine Control Boards.

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