DS200TCDAH1BHE in the Mark V I/O Chain

Contact inputs and relay outputs on a Speedtronic Mark V panel run through the TCDA card, and DS200TCDAH1BHE is an H1-group unit of this Digital I/O board. It brings field signals – limit switches, permissive contacts, status points – into the control system, and pushes relay-driven signals out to contactors, solenoids, and annunciator circuits. Software configuration determines each terminal's role; the card's physical layout doesn't change point to point.

Mechanically, the TCDA sits in one of the Mark V's control cores: <R>, <S>, or <T> in a TMR panel, or the single core of a Simplex panel. It's also part of the documented card set in the <C> communication core on many systems, working alongside a companion relay board (TCRA) and I/O cards like TCQA, TCQE, and TCEA over the IONET.

Before You Buy: Check These First

A TCDA-related alarm doesn't automatically mean this card is bad. Documented Mark V troubleshooting cases show these causes behind the classic symptoms – continuous I/O status cycling or repeated "card lost" diagnostics after a trip:

• IONET termination resistors in the wrong spot. Termination belongs IN at the TCDA and OUT on every TCEA card in the loop; a single TCEA wired backwards will reproduce the same fault as a failed TCDA.
• The TCPS power supply to the core, rather than the TCDA card – verify its output rails first.
• Transients on the control power bus, from a battery charger or from de-energizing unsuppressed DC coils near the cabinet.
• An outstanding PROM/firmware revision, since GE has resolved some IONET communication issues with a firmware update rather than a hardware swap.
• Loose card seating or a corroded connector pin on the board or ribbon cable.

Keep the TCDA distinct from its relay-output partner, TCRA, when troubleshooting: TCRA's electromechanical relays wear with switching cycles, while the TCDA's solid-state logic doesn't share that failure path. A relay output that won't energize points to TCRA more often than to this card. There's no fixed retirement age for a TCDA – plenty run eight-plus years trouble-free, and general Mark V card experience puts mean time between failures in the low hundreds of thousands of hours, with cabinet heat, humidity, dust, and voltage transients causing most real failures rather than age alone.

Reading DS200TCDAH1BHE

DS200 marks the Mark V-era board series, TCDA is the Digital I/O function, H1 is the product grouping, and BHE is this unit's specific functional and artwork revision combination. H1 and G1 TCDA cards are separate hardware groupings under the same acronym – do not assume one substitutes for the other without checking your system documentation. Quote and order against the full string, DS200TCDAH1BHE, matched to the label on the card being replaced.

Related Boards and the Mark VI Path

TCDA appears alongside TCRA, TCQA, TCQE, TCEA, STCA, and UCPB in most Mark V troubleshooting contexts. If your facility is considering a platform migration, GE's Mark VI system replaced the DS200 series with IS200-series boards and a different I/O architecture; our Mark V vs Mark VI: DS200 to IS200 guide covers the general mapping. For how GE's Speedtronic part numbers are structured, see the GE Speedtronic Part Number Decoder, and for TCDA's place among the other DS200 boards, see GE Mark V DS200 Boards Explained.

Information to Include in Your Quote Request

• Complete part number and suffix, e.g., DS200TCDAH1BHE
• A photo of the card's label
• Turbine model and panel configuration (Simplex or TMR)
• Quantity
• Urgency – planned procurement or unit-down situation

Request a Quote

This DS200TCDAH1BHE is offered used, clean and tested, with a 1-year warranty (see below). As with all our Mark V boards, pricing isn't published online since it depends on exact revision match and stock – submit a Request a Quote and our team responds within 24 hours. We ship worldwide DDP, accept purchase orders, and support both scheduled maintenance and emergency turbine-down orders.

General Information about the Product
Part Number	DS200TCDAH1B Mark V DS200
Description	GE DS200TCDAH1B DS200TCDAH1BHE Digital I/O Board Mark V
Condition	used Clean and Tested. With 1 Year Warranty.