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Product Brief Description
The GE 369B1873G0021 Digital Input Terminal Board is a component of the GE Mark VIe control system, specifically designed to handle digital inputs. It’s a terminal board, often referred to by its model designation, TBDI. This model provides 32 channels for monitoring on/off signals from field devices. The primary purpose of a digital input board is to provide a reliable interface for the control system to receive discrete signals, such as the status of a limit switch, a motor starter, or a relay contact.
Detailed Product Description
The 369B1873G0021 is a crucial part of the input signal chain in a Mark VIe system. It serves as the physical connection point where wiring from field devices terminates. The I/O pack, which is installed on this terminal board, processes these digital signals and communicates them to the main controller. The “TBDI” designation refers to a Terminal Board for Digital Input.
This board is designed to be robust, often including noise suppression circuitry to protect against high-frequency noise and voltage surges. This is especially important in industrial environments where wiring for digital inputs might run alongside power cables. The board’s design ensures a clear, reliable, and isolated signal is sent to the I/O pack, which in turn passes the information to the controller for use in the control logic.
Key Features and Specifications
- Part Number: 369B1873G0021
- Model Name: TBDI (Terminal Board Digital Input)
- Module Type: Digital Input Terminal Board for I/O Pack
- Channels: 32 digital input channels
- Input Type: Accepts discrete on/off signals (e.g., from dry contacts, switches, or relays).
- Primary Function: Provides wiring termination and signal conditioning for a digital input I/O pack.
- Mounting: Designed for mounting in a control cabinet or on a DIN rail.
- Compatibility: Used with specific Mark VIe digital input I/O packs.
Functional Role in a System
In a Mark VIe system, the 369B1873G0021 is where the physical world meets the digital controller. Field devices, such as pressure switches, limit switches, or emergency stop buttons, are wired to this terminal board. The board provides the necessary signal conditioning and isolation before the signal is read by the digital input I/O pack. The I/O pack then digitizes the signal and sends it over the IONet to the controller. This allows the controller to know the exact status of various plant components at any given time, enabling it to execute the proper control sequence.
Common Applications
This TBDI board is essential for a wide range of industrial applications that require monitoring discrete states. Common applications include:
- Process Monitoring: Reading the status of equipment like pumps (running/stopped), valves (open/closed), and motors (on/off).
- Safety and Interlocks: Monitoring safety-critical devices like emergency stop buttons, door sensors, and limit switches to ensure safe operation.
- Sequence Control: Receiving discrete signals that indicate the completion of a step in a process, allowing the control system to move to the next step.
