Description
GE IS230TCISH6C | 125 VDC TMR I/O Assembly | Mark VIe Turbine Control
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | IS230TCISH6C |
| Manufacturer | GE General Electric |
| Control Platform | Mark VIe |
| Functional Family | TCIS |
| Assembly Description | TBCIS2C / YDIAS1A |
| I/O Architecture | TMR |
| Field Voltage Class | 125 VDC |
| Product Type | Mark VIe I/O / terminal assembly |
| Mounting | DIN rail |
| Field Interface | Removable terminal blocks |
| Associated I/O Architecture | I/O pack mounted to terminal assembly |
| Application | Turbine control and discrete field signal acquisition |
The strongest model-specific identification describes IS230TCISH6C as a “TBCIS2C/YDIAS1A 125VDC TMR ASM.” Another technical reference describes the general IS230TCISH6C as a Mark VIe DIN-rail I/O module consisting of an I/O pack and terminal board, with the terminal board providing the field wiring interface and passive signal circuitry.
Product Introduction
The GE IS230TCISH6C is a Mark VIe turbine-control I/O assembly associated with the TBCIS2C/YDIAS1A 125 VDC TMR configuration. It belongs to the distributed I/O architecture used by GE Mark VIe systems, where the terminal assembly provides the field wiring interface and the associated I/O electronics perform local signal acquisition and processing.
The important engineering characteristic of the GE IS230TCISH6C is its TMR configuration and 125 VDC field interface. This makes the complete assembly configuration more important than simply matching the IS230 prefix. The terminal board, associated I/O pack, field wiring, redundancy arrangement, and Mark VIe configuration should all be checked before a replacement is installed.
IS230TCISH6C
Application Scenarios & Field Pitfalls — Engineer’s Perspective
Engineering Pain Point
The primary replacement risk is confusing this assembly with another GE Mark VIe TCIS/STCI/TCAT family module. Similar-looking IS230 assemblies can have substantially different field interfaces and redundancy arrangements.
Typical Applications
- Turbine discrete signal acquisition — Interfaces field contact/status signals with Mark VIe turbine logic.
- 125 VDC field circuits — Used where higher-voltage turbine contact circuits are part of the control architecture.
- TMR turbine control — Supports redundant signal acquisition where three independent channels are required.
- Mark VIe distributed I/O — Installed as part of a local turbine-control I/O assembly rather than functioning as a standalone PLC CPU.
Technical Pitfalls to Avoid
- Do not treat as a generic analog I/O module. One current listing claims 12 analog inputs, 8 analog outputs, 24 digital inputs, and 16 relay outputs. There is no reliable evidence in the model-specific references supporting that description.
- Verify the 125 VDC TMR configuration. The strongest model-specific record explicitly identifies the part as a 125 VDC TMR assembly. A superficially similar 24 VDC or simplex board should not be substituted without checking the system drawings.
- Do not confuse the terminal assembly with the I/O pack. Mark VIe I/O hardware consists of an I/O pack mounted to a terminal board. The terminal board provides field termination and passive interface circuitry, while the I/O pack contains the local processing and data-acquisition electronics.
- Check the complete redundancy architecture. A TMR installation depends on the three-channel signal path, not simply the physical presence of one replacement board. Verify channel assignment, wiring, I/O pack identity, and system configuration before commissioning.
Related Products
- IS200TBCIS2C — Earlier Mark VI terminal-board designation associated with the TCIS family; verify the complete assembly before considering replacement.
- — Mark VIe 125 VDC TMR assembly; the primary part number covered here.
- IS200STCIH6A — Mark VI/Mark VIe STCI contact-input terminal board for a different I/O architecture.
- IS200STCIH6AED — Configured STCI H6A contact-input board; not automatically interchangeable with the TCIS H6C assembly.
- IS230SNCIH6A — Mark VIe simplex contact-input assembly; different redundancy architecture.
- IS220PDIAH1A — Mark VIe discrete I/O pack family used with compatible terminal-board assemblies.
- IS220PDIAH1B — Related PDIA I/O pack revision; verify firmware and system compatibility.
- IS230TCAT family — Mark VIe terminal assemblies for different signal applications; do not substitute solely because the physical format appears similar.
Procurement Note
For a replacement, specify the complete part number and identify the associated TBCIS2C/YDIAS1A 125 VDC TMR configuration. The installed I/O pack should be documented separately.
For surplus hardware, inspect the terminal blocks, connector interfaces, board condition, and any evidence of field overvoltage. The 125 VDC field circuit is particularly important: verify the actual plant wiring and excitation before energizing a replacement.
I would also request photographs of the actual nameplate and connector side when buying a used unit. Generic descriptions such as “GE controller,” “analog I/O module,” or “multi-channel turbine controller” are not sufficient evidence of compatibility for this part.
