GE IS230TDBTH6A Discrete I/O Board

The GE IS230TDBTH6A, also cataloged as the IS230TDBTH6A Discrete I/O Board, operates as a dedicated hardware component for TMR contact input and relay output execution within Mark VIe control platforms. Configured for high-density signal handling, this terminal board provides direct physical execution of twenty-four isolated contact inputs and twelve form-C relay outputs.

Hardware Specifications

Industrial Control and I/O Density Scaling

The IS230TDBTH6A facilitates I/O density scaling through a triple modular redundancy (TMR) architecture requiring three PDIO I/O packs. Each contact input features integrated hardware filtering (4 ms) and noise suppression circuitry to mitigate surge and high-frequency interference. The board supports field-selectable wetting voltages of 24 VDC, 48 VDC, or 125 VDC. Communication with the R, S, and T controllers is established via three dedicated D-type connectors (JR1, JS1, JT1), enabling redundant Ethernet networking to each associated PDIO pack. Firmware flash compatibility and deterministic data exchange are managed by the PDIO packs, which require all three modules to be present for correct TMR operation; single I/O pack deployment is not supported by the TDBT hardware configuration.

Frequently Asked Questions

Q: Can the IS230TDBTH6A be operated with a single PDIO I/O pack?

A: No. The TDBT board is engineered specifically for TMR redundancy. Attempting to run the system with a single I/O pack will result in incomplete logic voting and system-level communication faults.

Q: How are the contact inputs protected against electrical noise?

A: The contact inputs are equipped with onboard hardware filters and noise suppression components designed to reject high-frequency interference and voltage surges from field wiring.

Field Installation Guidelines

• Mounting: The board supports both DIN-rail mounting and flat-surface installation. Ensure the mounting orientation allows for adequate clearance of the three PDIO I/O pack connections.
• Wiring: Connect external contact inputs to the board while ensuring the wetting voltage matches the specified nominal input range (24/48/125 VDC). Use shielded cabling for input circuits to maintain noise immunity.
• Grounding: Establish a robust ground connection between the board chassis and the cabinet ground bus to ensure the efficacy of the surge protection circuitry.
• Connectivity: Verify the correct mapping of D-type connectors to the corresponding controller networks (JR1 to R, JS1 to S, JT1 to T) to maintain the integrity of the TMR voting architecture.