Description

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　　LDU-20 Other Names:

PCB Module LDU-20

LDU-20 Input/Output Module

Analog Module LDU-20

WARTSILA LDU-20 Control Module — Functional Description (Plain Text)

　　I. Product Positioning

The Wärtsilä LDU-20 is a partial display and control module designed by Wärtsilä specifically for marine, power plant, and industrial automation applications. Its full model name is 46WLDU20OE. As the core human-machine interface between the operator and the engine control system, it performs the dual functions of information display and equipment control.

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　　II. Core Functions

　　1. Display Function

The LDU-20 is equipped with a 7-inch or larger high-resolution color LCD screen, which intuitively presents the equipment’s operating status through a graphical interface. It can display key operating parameters such as engine speed, cylinder pressure, knock sensor values, lubricating oil pressure, and coolant temperature, while also displaying system information such as system software version, voltage levels of each module, and CAN bus communication status. Alarm information is presented in real time via audio and visual means, immediately triggering an alarm when the equipment malfunctions or malfunctions. Its page layout is configurable. The first page is typically the system information page, and subsequent pages are filled with various sensor data, local control status, ESM safety module status, and speed and phase values ​​of related modules as needed. This facilitates quick verification of status changes by operators during debugging and operation.

　　2. Alarm Management

Automatically issues alarm signals when equipment malfunctions or fails.

Provides audible and visual alarm prompts.

Real-time display of currently active alarms and alarm details.

Links with the UNIC system’s ESM (Engine Safety Module) to receive safety alarms such as overspeed and low lubricating oil pressure.

　　3. Control Operation

The LDU-20 uses a rotary knob and multi-function buttons for human-machine interaction. Operators can use it to perform local start and stop operations, reset faults, adjust operating parameters, and view historical data. It links with the Engine Safety Module (ESM), which is responsible for basic safety functions such as overspeed protection and low lubricating oil pressure shutdown, and detects faults in critical signals. Detected faults are simultaneously transmitted to the LDU-20’s alarm system.

　　4. Data Acquisition and Monitoring

Acquires real-time data from engine controllers (such as MCM, IOM, etc.) via CAN bus.

Displays cylinder pressure sensor values, knocking sensor values, pressure sensor values, etc.

Displays key module data such as ESM status, speed values, and phase values.

Supports step-by-step verification of equipment status changes (commonly used in debugging and testing phases).

　　5. Communication Functions

The LDU-20 supports multiple communication interfaces such as CAN bus and Ethernet, enabling data exchange with IOM input/output modules, MCM main control modules, and other external systems for remote monitoring. In the UNIC automation system, it is the core local display unit of version C2, adding bus communication capabilities compared to version C1, allowing alarm and monitoring data to be uploaded to external systems.

　　6. System Information View

Displays software version number

Displays voltage levels of each module

Displays CAN bus communication status

Provides access to engine process data and alarm logs

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　　III. Hardware Features

Display: 7-inch or larger, high-resolution color LCD screen

Operation: Touchscreen + rotary knob + multi-function buttons

Design: Modular structure, easy to maintain and expand

Environmental Adaptability: Suitable for harsh marine and industrial environments

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　　IV. Typical Application Scenarios

Specific Uses of Application Scenarios

Engine Control Room: Displays engine parameters and alarm information, performs start-stop and reset operations

Engine Room Control Room: Centrally displays the operating status of engine room equipment

Industrial Boiler: Displays boiler pressure, temperature, and other parameters and provides control

Industrial Compressor: Displays compressor operating status and provides control

Generator Set: Displays output power, voltage, frequency, etc. and provides control

Debugging and Testing: Serves as a status verification terminal, checking the status of all sensors and modules page by page

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　　V. Role in the UNIC System

LDU-20 is a UNIC (World Unified…) The local human-machine interface (HMI) for the control system. UNIC comes in two versions, C1 and C2:

UNIC C1: All signal interfaces are hardwired.

UNIC C2: Control functions are hardwired; alarms and monitoring communicate via bus.

In both versions, the LDU-20 serves as the primary interaction window between the operator and the engine control system, handling core tasks such as start/stop control, real-time data reading, alarm viewing, and parameter setting.

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