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Product Brief Description
The GE 369B1874G0025 is a Digital Output (DO) Terminal Board featuring 16 DC relay outputs. The most critical feature of this board is that its relays are configured with Normally Closed (NC) contacts. This means the relay circuit is closed by default, allowing current to flow to the field device, and opens to stop the current when a control signal is applied. This design is essential for safety-critical and fail-safe applications where a device must remain active unless explicitly commanded to turn off.
Detailed Product Description
This terminal board provides an isolated interface for connecting an industrial control system’s I/O pack to 16 external DC-powered devices. Unlike a Normally Open (NO) relay, which requires a signal to close the circuit, the NC relay on this board has its contacts closed by default. A control signal from the I/O pack energizes the relay coil, which causes the contacts to open and interrupt the DC circuit to the connected device. This “fail-safe” functionality ensures that if power to the control system or board is lost, the default state of the connected device is “on.”
Key Features and Specifications
- Part Number: 369B1874G0025
- Module Type: Digital Output Terminal Board
- Channels: 16 DC relay outputs
- Primary Function: Provides isolated DC relay outputs with Normally Closed (NC) contacts for fail-safe applications.
- Compatibility: Designed for use with GE’s industrial control platforms (e.g., Mark VIe, EX2100e).
- Output Type: Relay contacts (NC)
- Benefits: Guarantees a default “on” state for critical devices, enhances system safety, and provides electrical isolation.
Functional Role in a System
The 369B1874G0025 is particularly useful in systems where a device must be active under normal conditions and only turn off under a specific command or fault. For example, in a safety system, an NC relay could be wired to a solenoid valve that controls a cooling flow to a reactor. As long as the system is operating normally, the relay remains closed, and the cooling flow is active. If the control system detects an over-temperature condition, it sends a signal to the board to open the relay contacts, thus shutting off the cooling flow to prevent further damage.
Common Applications
The board is a key component in systems that rely on fail-safe logic:
- Emergency Shutdown Systems: Used to activate or deactivate critical safety devices in the event of an emergency.
- Process Control: Maintaining a default “on” state for pumps or valves until a specific condition is met.
- Safety Interlocks: Ensuring machinery remains in a safe, running state unless an interlock is tripped.
- Fire & Gas Detection: Activating alarms or shutdown procedures when a fire or gas is detected.
