This board focuses on data exchange, signal processing and equipment coordination in distributed control systems, and is widely compatible with mainstream automation control systems such as ALSPA CE2000 and ALSPA P320. Featuring modular design, multi-protocol compatibility and wide environmental adaptability, it serves as a core supporting component in automation systems for critical industries including power, petrochemical and water treatment.It undertakes key tasks such as data transmission, logic control and condition monitoring, ensuring stable and efficient operation of industrial production processes. Meanwhile, it offers excellent maintainability and scalability, meeting the dual requirements of legacy system upgrades and new system construction.

Core Functions and Features of the LC105A-2 BOARD

1. Data Exchange and Communication RelayActing as a communication hub, the board supports mainstream industrial protocols including Modbus, Profibus, and Ethernet/IP. It enables high-speed data transmission between the central controller, remote I/O modules, field sensors, and actuators. It packages analog and digital signals (e.g., temperature, pressure, current) collected from field devices and uploads them to the main controller, while accurately issuing control commands from the main controller to field equipment. With a data response delay of less than 10 ms, it ensures real-time and reliable data transmission for fast control loops.
2. Local Logic Control and Data PreprocessingEquipped with a dedicated DSP chip, the board provides basic local logic processing. It preprocesses and filters field signals to remove interference and improve data accuracy. It also executes predefined local control logic to maintain normal operation of field devices during temporary main controller interruptions, preventing production downtime and enhancing system robustness. Logic parameters can be flexibly tuned via configuration software to adapt to diverse industrial applications.
3. Status Monitoring and Diagnostic AlarmThe board features comprehensive self-diagnostics for real-time monitoring of its own power supply, communication status, and operating conditions, as well as the status of connected I/O modules and field devices. It triggers immediate alarms for abnormalities such as power faults, communication failures, signal overranges, and module malfunctions, with clear LED indications. Fault information is also uploaded to the host monitoring system, enabling quick fault localization and reducing maintenance costs.
4. Redundancy and Hot-Swap SupportDesigned with redundancy, the board supports dual-module redundant configuration. Upon failure of the primary unit, the backup board achieves millisecond-level switchover to ensure uninterrupted production — critical for power, petrochemical, and other continuity-sensitive industries to avoid costly unplanned shutdowns. It also supports hot swapping, allowing board replacement and maintenance without system shutdown, greatly improving maintainability and reducing downtime.
5. Modular ExpansionAdopting a standardized modular design, the board allows flexible expansion of I/O interfaces in type and quantity according to on-site control requirements. It supports digital input, digital output, analog input/output, and other signal types, adapting to industrial control systems of various scales. This eliminates the need to replace the entire board or control system, lowering costs for system upgrades and capacity expansion.

Technical Specifications

1. Power SpecificationsPower supply: 24 VDC; typical operating voltage range: 19.2–28.8 VDC. Equipped with over‑voltage and over‑current protection to withstand voltage fluctuations in industrial environments and ensure stable operation. Low power consumption: ≤15 W under non‑redundant configuration, ≤30 W under redundant configuration, saving energy and reducing heat dissipation requirements.
2. Operating EnvironmentOperating temperature: -20 °C to 60 °C, suitable for harsh industrial environments. Storage temperature: -40 °C to 85 °C for long‑term storage and transportation. High electromagnetic immunity compliant with relevant IEC standards, resistant to strong interference from inverters, excitation systems, etc., ensuring stable signal transmission and control logic. Protection class: IP20, designed for installation in industrial control cabinets.
3. Communication ParametersSupports industrial communication protocols including Modbus, Profibus, and Ethernet/IP. Communication speed is adjustable, with a maximum rate of up to 100 Mbps. Equipped with RS‑232, RS‑485, and Ethernet interfaces; some models support fiber‑optic communication for long‑distance data transmission with reduced signal attenuation, suitable for large‑scale distributed industrial sites. Supports ring topology and star connection to improve network stability and scalability.
4. I/O Interface ParametersDefault configuration includes multiple digital input/output and analog input/output interfaces, expandable as required.

• Digital input: dry contact / wet contact, 24 VDC
• Digital output: relay / transistor output, maximum output current 2 A
• Analog input: 0–10 V, 4–20 mA; accuracy ±0.1% F.S.; resolution 12 bits (4096 steps)
• Analog output: 0–10 V, 4–20 mA; maximum load driving capability 750 Ω @ 20 mA, capable of driving electro‑hydraulic converters, actuator positioners, and other field devices.

5. Hardware ConfigurationBuilt‑in high‑performance CPU and data buffer for temporary storage of I/O process image data, ensuring continuous data transmission. Uses high‑reliability industrial‑grade components with long service life; MTBF ≥ 50,000 hours to meet long‑term stable operation requirements. Integrated power filtering circuit further improves anti‑interference performance.
6. Software CompatibilityCompatible with GE/ALSTOM dedicated configuration tools (e.g., Alspa Engineering Toolset, Controcad), supporting parameter configuration, logic programming, firmware upgrade, and fault diagnosis. Supports online firmware upgrade to load the latest version, fix vulnerabilities, and improve performance and compatibility.

Applications

1. Power IndustryMainly used in the automation control systems of thermal power plants, substations and conventional islands of nuclear power plants. It performs signal processing and control tasks for steam turbine DEH systems, boiler combustion control systems, water treatment systems, and transmission & distribution line protection. It enables precise control of unit speed, pressure, water level and other parameters, ensuring stable, safe and efficient power generation, acting as an “intelligent protection unit” in the secondary circuits of power systems.
2. Petrochemical IndustryApplied in the process automation control of refineries and chemical plants, suitable for high-temperature, high-pressure and highly corrosive industrial environments. It controls equipment operation during refining and chemical production, monitors key parameters such as pipeline pressure, medium flow and temperature, realizes automatic regulation of production processes, and avoids safety accidents caused by human error or equipment failure.
3. Water Treatment IndustryUsed in the automation control systems of wastewater treatment plants and waterworks. It monitors and controls the operation of pumps, valves, aeration equipment and other devices, collects parameters such as water quality and flow rate, realizes automatic management of water treatment processes, improves treatment efficiency and ensures effluent quality meets standards.
4. Manufacturing IndustryDeployed in large industrial production lines and automated workshops for remote equipment control and monitoring, including motor start/stop, speed regulation, robot actuation, etc. It cooperates with various sensors and actuators on the production line to improve automation levels, reduce labor costs and minimize production errors.
5. Other FieldsAlso applied in new energy projects such as wind power and photovoltaic power generation, realizing remote monitoring and intelligent dispatch by integrating distributed equipment. It is suitable for automation control systems in heavy industries such as metallurgy and cement, undertaking control and monitoring tasks for key equipment and adapting to harsh industrial production environments.

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