A manufacturer-sourced guide to reading GE Mark VIe board and assembly identifiers, understanding the role of the four-character board name, and checking group, functional-interchangeability and revision positions before a purchase order, outage replacement or maintenance decision.
November 6, 2026 — GE Mark VIe inventories contain terminal boards, processor boards, I/O packs, distribution boards and complete assemblies whose identifiers may look similar at first glance. A label beginning with IS200 is useful, but it is not a complete compatibility statement.
GE Vernova certification documents show a structured nomenclature in which the prefix identifies a board or assembly class, a four-character block names the board family, and later positions describe construction, group, functional interchangeability and revision. Those later characters should remain attached to the model during RFQ, quotation and receiving inspection.
Technical basis: The nomenclature and official pairing examples below were checked against public GE Vernova Mark VIe product and certification documents. The procurement guidance below does not replace the applicable GE instruction, system drawing, bill of material or site-approved engineering procedure.
Read the entire identifier—not only IS200 and not only the four-letter family. In GE's published nomenclature, IS200 identifies a board, the next four letters identify the board name, the following letter describes the construction category, the number identifies a group/component list, and the remaining letter positions address functional interchangeability and revision.
A code such as IS200TBAIH1C should therefore be verified as a complete string. A different group or revision may require a drawing, firmware, terminal assignment, system-document or GE service review before it is accepted.
The example below uses the official GE nomenclature positions as a reading framework. The exact number of suffix letters visible on a product can vary, so the equipment label and the document for that specific assembly remain authoritative.
| Position | Published meaning | How to use it |
|---|---|---|
| IS200 | Board identification | Establishes that the identifier is for a board. GE documents also use prefixes such as IS210, IS220, IS400, IS410 and IS420 for other boards or assemblies. |
| TBAI | Board name — any four A–Z characters | Treat the four-letter block as one family code. Do not invent a universal letter-by-letter expansion unless the exact GE document provides it. |
| H / G / M / S | Construction category | GE's nomenclature lists H for surface-mount components, G for through-hole components, M for a module with a parent and daughter board, and S for SIL-certified equipment. |
| 1 | Group number | Identifies the component list used for the bare board. A different group number is not automatically equivalent. |
| C | Functional interchangeability | This position is directly relevant to replacement review. Confirm the official interchangeability instruction rather than assuming a later letter is always backward compatible. |
| A | Schematic or bill-of-material revision | Record every final revision character shown on the label. Revision significance must be checked against the exact GE document or system record. |
IS200 appears across many functions. It does not by itself tell a buyer whether the item is an analog terminal board, discrete input terminal board, relay output board, distribution board, processor board or another component. The full code and the system context must be retained.
GE Vernova describes Mark VIe as a distributed control platform used for integrated control, protection and monitoring. A field signal commonly passes through more than one separately identified component, so a board number should be checked within the complete signal path.
This simplified path is not a wiring instruction. Mark VIe installations may use simplex, dual or triple-redundant arrangements, specialized protection modules, different controller generations and application-specific terminal boards. Always work from the installed system drawing.
GE's published nomenclature identifies IS200 as board identification and IS220 as assembly identification. Many Mark VIe field I/O functions therefore combine an IS220 I/O pack with an approved IS200 terminal board. The two identifiers describe different physical and functional levels and should not be treated as competing names for the same component.
Mark VIeS is GE Vernova's functional-safety platform. Safety-certified I/O and terminal-board codes must be reviewed within the certified Mark VIeS configuration. A standard Mark VIe board should not be presented as a safety-system substitute simply because the connectors or basic function appear similar.
The following examples are drawn from GE Vernova's publicly available Mark VIe certification schedules. They demonstrate why the I/O pack and terminal board should be verified together; they are not a universal substitution chart.
| I/O pack or module | Officially documented terminal-board examples | Function represented |
|---|---|---|
| IS220PAICH1A | IS200STAIH1A, IS200STAIH2A, IS200TBAIH1C | Analog I/O |
| IS220PDIAH1A | IS200STCIH1A, IS200STCIH2A, IS200STCIH8A, IS200TBCIH2C, IS200TBCIH4C | Discrete input |
| IS220PDOAH1A | IS200TRLYH2E, IS200TRLYH3E, IS200TRLYH1F, IS200TRLYH2F | Discrete output |
| IS220PTCCH1A | IS200STTCH1A, IS200STTCH2A, IS200TBTCH1B, IS200TBTCH1C | Thermocouple input |
| IS220PRTDH1A | IS200TRTDH2D, IS200SRTDH1A, IS200SRTDH2A | RTD input |
| IS220PVIBH1A | IS200TVBAH2A, IS200WNPSH1A | Vibration monitoring |
| IS220PSVOH1A | IS200TSVCH2A, IS210WSVOH1A | Servo control |
| IS220PSCAH1A | IS200SSCAH1A, IS200SSCAH2A | Serial communication |
GE's nomenclature states that the group number identifies the component list used for the bare board. It is part of product identity, not a packaging count or an optional marketing designation.
Functional interchangeability and schematic/BOM revision are separate concepts. A change can affect components, connectors, jumpers, firmware support, diagnostics, approvals or system documentation. Review the applicable GE technical information, drawing and installed configuration before accepting any suffix change.
For outage planning, capture clear photographs of the complete label, rack position, connected I/O pack, terminal board, connector designations, jumpers and surrounding assembly. Do not build an RFQ from an abbreviated maintenance list when the physical label is available.
A strong RFQ can be short: complete model, quantity, installed system, mating hardware, required revision or approved interchangeability, nameplate photographs and delivery location. Missing any of these items may delay a technically responsible quotation.
The following models are provided as cross-brand industrial spare-parts references and are not direct substitutes for GE IS200 or Mark VIe boards. Confirm the manufacturer, complete model, revision and system compatibility before ordering.
No. GE uses IS200 as a board-identification prefix across multiple functions. The four-letter board name and complete suffix are required to identify the item.
Not safely as a universal rule. GE's nomenclature defines the block as the board name using four letters. Use the exact GE manual or certification schedule to identify that family rather than inventing an expansion.
No. GE documentation identifies IS200 as a board and IS220 as an assembly. An IS220 I/O pack may be used with one or more approved IS200 terminal boards, but they are different components.
No. The revision and functional-interchangeability positions must be reviewed against official GE information and the installed system configuration.
Do not assume so. Mark VIeS is a certified functional-safety system. Use only the hardware combinations and revisions included in the approved safety documentation.
Send the complete board and assembly codes, clear nameplate photographs, Mark VIe or Mark VIeS system identification, controller and I/O pack details, rack position, quantity and any required revision or approval.
Official sources were reviewed in November 2026. Manufacturer documentation and supported combinations may change; confirm the current revision for the installed system.
Send the full nameplate code, system generation, mating I/O pack or terminal board and clear equipment photographs for an exact-order review.
Disclaimer:
Nordwel sells new and surplus products and develops channels for purchasing such products. This website has not been approved or recognized by any of the listed manufacturers or trademarks.
![Siemens 6ES7157-0AD82-0XA0 Ex [i] DP/PA bus coupler product views](/uploadfile/202610/27/b70843fcaef95b3cefb4caf74a3a412d_thumb.jpg)
