DS3800HIOD1H - Digital I/O Board

SPECIFICATIONS:

Part Number: DS3800HIOD1H
Manufacturer: General Electric
Series: Mark IV
Product Type: Digital I/O Board
Form Factor: Rack-mountable plug-in module
Number of channels: 12
Input Voltage Range: 24 V DC
I/O Connections: Ribbon-style connectors
Operating temperature: -40 to +70°C
Size: 8.25 cm high x 4.18 cm
Repair: 3-7 days
Availability: In Stock
Weight: 2 lbs
Country of Origin: United States

FUNCTIONAL DESCRIPTION:

DS3800HIOD1H is a Digital I/O Board manufactured and designed by General Electric as part of the Mark IV Series used in GE Speedtronic Control Systems. This PCB assembly enables reliable interfacing between the central control processor and discrete field-level digital devices. The board is configured to support multiple digital channels, typically operating at 24 V DC logic levels. Mechanically, it is built with edge connectors and retention levers for easy insertion and secure locking into a backplane rack. The DS3800HIOD1H supports high-density pin configurations through dual 10-pin and a single 40-pin connector layout, optimizing signal routing while maintaining electrical integrity. It is conformally coated to protect against environmental stress and designed to meet stringent industrial operating conditions with a temperature range typically from -40°C to +70°C. The board complies with redundancy and failover architecture as adopted in the Mark IV platform to enhance system availability and reliability.

FUNCTIONS OF DIGITAL I/O BOARD:

• Digital Input Signal Acquisition: Accepts discrete digital signals (typically 24V DC or TTL) from external field devices such as limit switches, proximity sensors, pressure switches, and status relays. Each input channel uses opto-isolation to electrically separate the field circuitry from the logic processing domain, providing protection against voltage transients and ground loops.

• Digital Output Signal Transmission: Converts logic-level commands from the Mark IV controller into discrete ON/OFF signals used to drive external loads like relays, solenoids, contactors, or indicator lamps. Output channels are typically transistor-based (open collector) with integrated flyback diodes or snubber circuits for inductive load protection.

• Signal Conditioning and Debouncing: Employs hardware filtering (RC networks or Schmitt triggers) to eliminate spurious transitions due to contact bounce or electrical noise, ensuring clean digital signal edges.

• Logic State Buffering and Latching: Utilizes flip-flops or buffer ICs to latch input/output states, enabling synchronous operation and consistent signal timing relative to control logic scans. Prevents race conditions and ensures deterministic I/O behavior within the Mark IV control loop.

• Electrical Isolation and Noise Immunity: Optical couplers and galvanic isolation are implemented across all input channels and certain outputs to meet industrial noise immunity standards and prevent electrical interference between I/O and control logic.

WOC maintains the largest inventory of replacement parts for GE Speedtronic Turbine Control Systems. Additionally, we offer warranty-backed unused and rebuilt boards as well as board repairs for your damaged ones. For your OEM needs, our team of professionals is available around the clock. We at WOC are happy to help you with any needs you may have in terms of automation. Please contact our team by phone or email for pricing and availability on any components and repairs.

FREQUENTLY ASKED QUESTIONS:

What types of signals are compatible with this board?

The board is compatible with standard industrial digital signals, including 24VDC and TTL logic levels. Input channels are designed to read dry contact closures, transistor outputs, and other binary signals, while output channels can control devices requiring ON/OFF states such as solenoids and relays.

How many input and output channels does the board support?

The DS3800HIOD1H typically supports up to 12 digital I/O channels, although the exact configuration may vary based on the system design and application. Channels can be configured for input or output based on firmware and hardware settings defined by the control system integrator.

What are the electrical characteristics of the input channels?

Each input channel is designed for dry contact or active voltage-based inputs, typically rated at 24VDC nominal. Inputs pass through an RC low-pass filter followed by opto-isolation to suppress transients and ensure logic-level signal fidelity.