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IS230TNIDH3A - Point Isolated Discrete Input TMR DIN-Rail Module is available in stock which ships the same day.
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TECHNICAL SPECIFICATIONS:
Part Number: IS230TNIDH3A
Manufacturer: General Electric
Series: Mark VIe
Functional Acronym: TNID
Product Type: Point-Isolated Discrete Input TMR DIN-Rail Terminal Board
Hardware Revision: Group 3 Architecture, Revision A (H3A)
Redundancy Configuration: Triple Modular Redundant (TMR)
I/O Pack Interface: Three dedicated high-density DC-62 pin headers matching PDIA packs
Discrete Logic Capacity: 24 dry contact binary input channels
Nominal Wetting Voltage: 125 V DC
Wetting Voltage Operational Window: 100 V DC to 145 V DC
State 2 (Logic Open / False): 50V DC
Nominal Wetting Current Path: 2.5mA per channel
Channel-to-Channel (Point-to-Point) Isolation: 1500 V RMS
Channel-to-Logic Core Isolation: 1500 V RMS
Hardware Debounce / Input Filter Delay: 4.0 milliseconds
Sequence of Events (SOE) Precision: 1.0-millisec
Form Factor / Mounting: Standard 35 mm
Internal Logic Power Input: 28 V DC nominal
External Wetting Power Requirements: 125 V DC
Circuit Board Protection: High-grade Conformal PCB Coating
Ambient Operating Temperature: -30 °C to +65 °C
Storage Temperature Envelope: -40 °C to +85 °C
Relative Humidity Boundaries: 5% to 95%
Repair Lead Time: 3-5 Business Days
Availability: In Stock
Country of Origin: United States
The IS230TNIDH3A is a Point-Isolated Discrete Input TMR DIN-Rail Terminal Board designed and manufactured by General Electric for the Speedtronic Mark VIe control platform. The Point-Isolated Discrete Input TMR (TNID) terminal board is a ruggedized field termination module that accepts 24 dry contact binary input channels and connects to parallel processing I/O packs. The processing packs plug into the three dedicated high-density DC-62 pin headers (designated R, S, and T channels) and communicate across the distributed architecture. The 24 discrete inputs accommodate dry contact field sensors and mechanical switches. Each discrete input features individual point isolation to protect against electrical cross-talk. Each tracking channel is built with a dedicated channel-to-channel isolation rating of 1500 V RMS. An on-board circuit configuration handles deep loop status detection for diagnostic stability.
DISCRETE INPUT DATA ISOLATION & CONDITIONING:
The primary hardware layer manages up to 24 point-isolated discrete input channels configured to interface with binary field switches. The board processes raw state transitions from field instrumentation, such as limit switches, pushbuttons, and auxiliary mechanical relays. Every input path passes through an independent isolation block that dampens common-mode noise and breaks ground loops, optimizing the accuracy of state transitions performed when the signals migrate through the DC-62 pin connection interface to the parallel processing cores.
TRANSMITTER LOOP DRIVE & INTERFACING:
To sustain external switch contact operations, the module coordinates with an external, isolated 125 V DC excitation power source. This loop arrangement supplies sufficient voltage across the termination points to clear oxide films or mechanical contact resistance. The electrical power paths utilize current-limited configurations to regulate loop current at approximately 2.5mA per channel, preventing thermal loading and containing faults to the affected loop without dropping the logic rails of adjacent tracking strings.
INSTALLATION:
The TNID terminal board assembly is engineered for flexible cabinet integration and space-conscious spacing inside containment enclosures. The structural assembly clips directly onto standard 35 mm industrial top-hat DIN rails for quick physical integration. The multi-layered printed circuit board is sealed beneath a high-dielectric polyurethane/acrylic conformal PCB coating to guard delicate surface-mount components against dust, humidity, and corrosive environments.
OPERATION:
Internal logic circuits run on 28 V DC nominal power drawn directly from the cabled Mark VIe controller backplane link, bypassing external power line constraints. The inputs accept high-voltage field excitation loops with a continuous operational tracking window of 100 V DC to 145 V DC. Transition points are precisely managed, reading logic open configurations when dropping below 50V DC. It fans each input out to three concurrent pathways, mapping directly to three parallel processing connectors to execute fault-tolerant voting logic across the system network.
We specialize in supplying high-quality OEM replacement parts for critical turbine control and industrial automation systems, including General Electric Mark VIe and Mark VIeS platforms. Our extensive inventory includes both unused surplus and professionally rebuilt components, allowing customers to reduce downtime and maintain system reliability during planned maintenance or emergency shutdowns. Every part is thoroughly inspected, tested, and verified in our advanced electronics lab to ensure dependable performance and compliance with original equipment standards.
Beyond parts supply, World of Controls provides dedicated 24/7 technical support to help customers with troubleshooting, repair services, and product identification. Our experienced engineering team offers fast turnaround times, global shipping, and warranty-backed solutions to support critical industrial operations worldwide. Whether you need immediate replacements or long-term maintenance support, we are committed to delivering reliable products and expert service that keep your systems running efficiently.
What is the GE IS230TNIDH3A?
It is a Point-Isolated Discrete Input TMR DIN-Rail Terminal Board designed for the Mark VIe control system. It provides a compact field termination module that collects isolated binary input switch signals and routes them across redundant tracking pathways into the main controller core.
What type of redundancy does the TNID terminal board use?
It is built on a Triple Modular Redundant (TMR) architecture, meaning the board distributes each input signal to three separate processing paths. These redundant paths allow the control system to compare signals and perform voting logic to identify faults or inconsistencies. This architecture significantly improves system reliability and ensures continuous operation in critical applications.
What is the operating wetting voltage range of the IS230TNIDH3A?
The board uses an external wetting voltage source with a nominal rating of 125 VDC and an operational range between 100 VDC and 145 VDC. This voltage is applied across the dry contact loops to maintain reliable signal detection and ensure stable contact performance. The wetting voltage also helps prevent oxidation buildup on switch contacts, improving long-term reliability.
What is the isolation rating of the TNID board?
Each input channel on the board provides 1500 V RMS isolation between channels and between the field side and the internal logic circuits. This high level of electrical isolation protects the system from voltage spikes, noise, and ground loop interference. It enhances signal integrity while reducing the risk of damage to connected control hardware.
