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TECHNICAL SPECIFICATIONS:
Part Number: IS230TDBSH4A
Manufacturer: General Electric
Series: Speedtronic Mark VIe
Functional Acronym: TDBS
Product Type: Simplex Discrete Input/Output Terminal Board
Hardware Revision: Group 4 Architecture (H4A)
Redundancy Configuration: Simplex Input/Output Redundancy
Core I/O Pack Association: Mates with 1 PDIO Discrete I/O Pack
Operational Voltage Value: 48 V DC Nominal wetting voltage baseline
Discrete Sensing Channels: 24 Group Isolated Contact Inputs
Relay Output Channels: 12 Form-C Relay Outputs
Circuit Board Protection: High-grade Conformal PCB Coating
Mounting Style: DIN-Rail Surface Mount Style
Repair Lead Time: 3-5 Business Days
Availability: In Stock
Country of Origin: United States
Manual: GEH-6721D
The IS230TDBSH4A is a Simplex Discrete Input/Output Terminal Board designed and manufactured by General Electric as part of the advanced Mark VIe control platform. The TDBS board is a simplex contact input/output terminal board designed for DIN-rail or flat mounting. The TDBS board accepts 24 group isolated contact inputs that are supplied with a nominal 24, 48, or 125 V dc wetting voltage from an external source. The contact inputs have noise suppression to protect against surge and high- frequency noise. TDBS provides 12 form-C relay outputs and accepts different option cards to expand relay functions. In the Mark VIe systems, the PDIO I/O pack works with the TDBS. The I/O pack plugs into the D-type connector and communicates with the controller over Ethernet. A single connection point for PDIO is provided, with one or two network connections possible from PDIO to the controllers.
INSTALLATION:
The TDBSH4A, plus a plastic insulator, mounts on a sheet metal carrier that then mounts on a DIN rail. Optionally, the TDBS plus insulator mounts on a sheet metal assembly that then bolts into a cabinet. The connections are wired directly to two sets of 48-point terminal blocks, typically using #18 AWG wires. The upper set of terminals, TB1, connects to the relay portion of the board, and the lower set of terminals, TB2, connects to the contact input circuits. Screw assignments for the two sets of terminals are identical to those found on the SRLY relay board and the STCI contact input terminal board. Shields should be terminated on a separate bracket. If a relay option board is used, it plugs onto TDBS connectors JW1 and JW2 and is held in place by the force of the connectors. The following table identifies the function of each relay terminal point grouped as TB1, as it relates to the presence of an option board. If external power is to be supplied, it is wired to a connector provided on the option board.
CONTACT INPUTS:
The contact input function and on-board signal conditioning are the same as those on STCI; they are scaled for 24, 48, and 125 V dc wetting voltage. The input wetting voltage range is 16 to 32 V dc, 32 to 64 V dc, and 100 to 145 V dc, respectively. The threshold voltage is 50% of the wetting voltage. The contact sensing circuits are shown in the I/O pack description. Contact input currents are resistance-limited to 2.5 mA on the first 21 circuits, and 10 mA on circuits 22 through 24. The 24 V dc supply on TDBSH2 is current-limited to 0.5 A using polymer positive temperature coefficient fuses that can be reset. Filters reduce high-frequency noise and suppress surge on each input near the point of signal entry. The discrete input voltage signals go to the I/O processor, which passes them through optical isolators, converts them to digital signals, and transfers them to the controller.
RELAY INPUTS:
TDBS uses pluggable type terminals and has connectors JW1 and JW2 supporting the option board connection. The relay portion of TDBS does not change between groups H2, H4, and H6; only the contact input circuits change. TDBS relays may be used at any specified AC or DC voltage without regard to board group. Without an option board, the SOL terminal associated with each relay has no connection. TDBS is designed to support a current rating of 5 A and voltage clearance greater than is needed for 250 V ac on all customer screw and JW1 circuits. The relay rating is the limiting item for each application.
WHY PARTNER WITH WORLD OF CONTROLS:
World of Controls provides the industry's most dependable logistics and technical infrastructure for critical turbine control networks. We maintain an extensive inventory of genuine OEM replacement parts for GE Distributed control setups, minimizing operational downtime during emergency outages. Every item, from certified unused surplus to fully rebuilt industrial components, is subjected to strict simulation profiling in our advanced electronics lab and is supplied with a comprehensive product warranty. Our global engineering support network operates 24/7 to deliver troubleshooting advice, component replacement guidance, and component testing evaluations. Contact the WOC sales team directly via phone or email for current pricing, hardware availability, or repair quotes.
What is GE IS230TDBSH4A?
It is a simplex discrete input/output terminal board used in turbine control systems. It is manufactured by General Electric for the Mark VIe platform. It connects field devices like switches and relays to the control system.
What is the function of the TB1 and TB2 terminals on the board?
TB1 terminals are used for routing all relay output connections on the IS230TDBSH4A board. TB2 terminals are dedicated to the 24 discrete contact input circuits. Both terminal blocks provide structured field wiring access for the system. This separation ensures clear isolation between input and output functions.
What is the role of the PDIO I/O pack in this system?
The PDIO I/O pack acts as the main interface between the terminal board and the Mark VIe controller. It collects input and output signals from the TDBS board and processes them into digital data. This data is then transmitted to the controller through an Ethernet communication link. It ensures fast and reliable signal handling in turbine control systems.
How is signal isolation achieved on the TDBS board?
Signal isolation is achieved using optical isolation within the I/O pack. This prevents electrical noise and high-voltage transients from reaching the controller. It also protects sensitive electronics from grounding issues and surges. As a result, system reliability and safety are improved.
What are the input current limitations per channel?
Each input channel is designed with built-in current limiting to protect the circuitry. Channels 1 to 21 are limited to approximately 2.5 mA. Channels 22 to 24 can handle up to 10 mA for higher load tolerance. These limits ensure safe operation under different field conditions.
What type of protection is used for the 24 V supply circuit?
The 24 V supply circuit uses polymer-based resettable PTC fuses for protection. These fuses limit the current to around 0.5 A under fault conditions. Once the fault is removed, the fuse resets automatically without replacement. This improves system uptime and reduces maintenance needs.
