GE IS400TDBTH6AEF Discrete Simplex Board

GE IS400TDBTH6AEF Discrete Simplex Board

The GE IS400TDBTH6AEF is a discrete I/O terminal board (TDBT) designed for the Speedtronic Mark VI and Mark VIe control platforms. Built as a high-voltage H6A variant, it processes 24 group-isolated 125 VDC contact inputs and drives 12 Form-C relay outputs while interfacing with PDIO I/O packs.

Signal Processing and I/O Architecture

The IS400TDBTH6AEF manages 24 group-isolated digital input channels rated for a nominal wetting voltage of 125 VDC, operating across an input range of 100 VDC to 145 VDC. Each input channel integrates a 4 ms hardware filter to suppress electrical noise and contact bounce from field switches.

For output control, the module provides 12 Form-C (SPDT) relay channels capable of directly switching solenoids, contactors, or indicator lamps. Built-in channel group isolation alongside over-voltage and over-current protection prevents field ground loops from propagating into the control logic.

System Integration and Installation

The terminal board connects to PDIO discrete I/O packs via D-sub connectors, communicating with the main Mark VIe controller over IONet. While designated as a discrete simplex board, it supports Simplex, Dual, and Triple Modular Redundant (TMR) configurations depending on the quantity of mated I/O packs.

Field wiring attaches to pluggable screw terminal blocks for straightforward maintenance and loop isolation. The board supports standard DIN-rail mounting or flat surface mounting inside an industrial control cabinet.

Technical Specifications

Frequently Asked Questions

Q: What wetting voltage is required for the digital inputs on the IS400TDBTH6AEF? A: As an H6A high-voltage variant, its 24 digital input channels require a nominal wetting voltage of 125 VDC, with an accepted operating range of 100 VDC to 145 VDC.

Q: How does this terminal board connect to the Mark VIe controller? A: It connects via D-sub connectors to PDIO discrete I/O packs, which then communicate with the Mark VIe controller over the IONet network.