About the IS200STAIS2A Group Variant

Most STAI boards you meet in the field carry H1A or H2A group codes; this listing is for the S2A group — IS200STAIS2A, shipped here as revision CB. Published GE-derived documentation describes the STAIS2A identically to its siblings in function: a Simplex Analog Input terminal board for Mark VIe distributed I/O that terminates 10 analog inputs and 2 analog outputs on high-density Euro-block terminals and operates with the PAIC Analog I/O pack, which handles digitization and Ethernet communication to the controller. The inputs cover two-wire, three-wire, four-wire, and externally powered transmitters plus ±5/±10 V dc signals; 24 V dc transmitter power is available on-board; the outputs are 0-20 mA with one loop jumper-selectable to 0-200 mA.

What public documentation does not spell out is the precise physical distinction between the S-group and H-group builds — so we will not invent one. The practical guidance is simple and safe: replace like with like. If your panel runs STAIS2A boards, order the S2A group; if the label says H1A or H2A, order that. Where a cross-group substitution is being considered, ask us first and we will verify against the revision documentation before anything ships.

Verify the Loop Before You Swap the Board

The terminal board is the passive partner in the analog input node, which makes it the last thing to condemn, not the first:

• Start at the transmitter: loop current measured at the STAI's terminals tells you immediately whether a dead reading is arriving dead from the field.
• Respect the cable limits: the documented limits are 15 ohms of two-way lead resistance, with support for runs up to roughly 300 meters — marginal wiring at the edge of those limits produces the sagging, unstable readings that get boards replaced for nothing.
• Use the diagnostics you already have: the mating pack monitors output health through on-board series resistors and interrogates the STAI's ID chip (board type, serial, revision). An ID mismatch raises a hardware incompatibility fault — a configuration problem masquerading as a hardware death.
• Isolate board from pack: a spare-channel test (move the loop, match the jumpers) implicates or clears the board's channel termination; a node-wide failure implicates the pack, its power, or its network before the passive board.

Matching S2A Exactly — and What CB Adds

Break the number apart: IS200 / STAI / S2A / CB. The first segment is GE's platform prefix — the same IS200 that leads countless Mark VI-era part numbers, which is why boards like this are habitually catalogued under Mark VI (our summary table below follows that convention) even though the STAI's documented service is Mark VIe distributed I/O, very much including Mark VIe retrofits at plants that began life on Mark V or Mark VI. The second segment names the function, the third is the group discussed above, and CB is the revision. For background on how GE numbering evolved across control generations, see the GE Speedtronic Part Number Decoder and our comparison guide Mark V vs Mark VI: DS200 to IS200.

How the STAI Mates With the PAIC I/O Pack

In the Mark VIe scheme, every I/O node is a two-piece assembly: the terminal board carries wiring, jumpers, burden resistors, and the ID chip; the I/O pack carries the processor, acquisition electronics, and dual Ethernet ports, connecting to the terminal board through a D-type connector. For this board that pack is the PAIC analog I/O pack. The single pack position is what makes the node simplex — redundant <R>/<S>/<T> configurations require the TBAI-class terminal boards designed to host three packs. When you order a replacement STAI, note your pack's part number too: pack and board are matched by the system's configuration, and quoting them together avoids a second outage if testing later implicates the pack.

Your Quote Request, Step by Step

1) Copy the full string from the label — IS200STAIS2ACB — or attach a photo. 2) Add the PAIC pack number from the same node. 3) Tell us the system (Mark VIe native or retrofit) and the machine it serves. 4) State quantity, condition preference, and urgency. 5) Give the delivery destination. Send it through the Request a Quote form and our team responds within 24 hours with availability and lead time. Shipping is DDP worldwide, purchase orders are accepted, and this particular unit is new surplus in original factory packaging with the warranty listed below. More IS200-prefix stock lives in our GE Mark VI IS200 Boards collection.