A Workhorse Termination Point for Simplex Analog Loops

Ten process transmitters and two control loops can all land on one compact board: that is the job description of the IS200STAIH2A, the pluggable-terminal build of GE's STAI Simplex Analog Input terminal board for Mark VIe distributed I/O. Pressure, level, flow, position — whatever the 4-20 mA or voltage signal, the STAI terminates it, applies the correct burden or scaling path per its jumper settings, and presents it to the PAIC Analog I/O pack seated on the board, which converts the signals and streams them to the controller over Ethernet. The documented I/O complement is 10 analog inputs (two-, three-, four-wire, or externally powered transmitters; ±5/±10 V dc voltage signals) and 2 analog outputs at 0-20 mA, one configurable to 0-200 mA; 24 V dc is available on the board for transmitter power.

This listing is a used IS200STAIH2ACB that has been cleaned and tested, with warranty coverage as stated in the table below — a practical way to keep spares on the shelf for a fleet that GE has long since moved past building.

Transmitter, Wiring, Board, Pack: Test in That Order

That sequence reflects both failure probability and test effort, and it will keep you from buying hardware you do not need:

• Transmitter. Most dead channels are dead loops. Verify the instrument and its power — including the board's own 24 V dc feed if the loop uses it — and measure current right at the STAI terminals.
• Wiring. Shielded twisted pair, shields landed at the provided terminal, lead resistance inside the documented 15-ohm two-way budget. Ground loops and floating shields create drift and noise that no replacement board will cure.
• Board. With the loop proven, test the channel itself: move the loop to a spare input configured with identical jumper settings. If the spare reads correctly and the original channel does not, the STAI's termination for that channel has genuinely failed — this is the case a replacement board fixes.
• Pack. Node-wide symptoms — every channel frozen, link loss, boot failures — belong to the PAIC pack, its power input, or its network, not to the passive terminal board beneath it. The pack also reads the board's ID chip at power-up; a configuration/board mismatch announces itself as a hardware incompatibility diagnostic, which is solved by matching, not by more replacements.

Interpreting IS200STAIH2ACB on the Label

Segment by segment: IS200 marks the GE board platform generation; STAI is the function code for this simplex analog input terminal board; H2A is the group, which in this family corresponds to the pluggable Euro-block terminal arrangement (the -1 style uses a fixed 48-point block instead); CB is the revision. When replacing, carry the full string — group mismatches change your wiring approach, and revision confirmation is a one-line question for us versus a return shipment for you. Our GE Speedtronic Part Number Decoder generalizes this logic across GE families.

Platform Context: From Cabled I/O to Pack-on-Board

Where Mark VI ran analog inputs through VME processor boards cabled to large terminal boards, the Mark VIe architecture that the STAI belongs to puts the acquisition electronics directly on the terminal board as a plug-on I/O pack. Simplex nodes use single-pack boards like this STAI; triple-redundant loops use TBAI-class boards hosting packs on the <R>, <S>, and <T> channels. The IS200 prefix survived across that transition — hence the Mark VI labeling conventions you will see in catalogs, including our table below — and plenty of STAI boards serve at plants that migrated to Mark VIe from earlier Speedtronic generations. For the fuller account of how GE's board numbering evolved, read Mark V vs Mark VI: DS200 to IS200.

Quote a Cleaned and Tested STAIH2A

Ready to quote? Send the Request a Quote form with: the exact part number and revision (IS200STAIH2ACB) or a label photo, the mating PAIC pack number, your system generation, quantity, urgency, and ship-to destination. Replies go out within 24 hours. We ship DDP worldwide — duties and clearance are our problem, not yours — and we accept purchase orders. Our related inventory is collected under GE Speedtronic Turbine Control Boards.