Application Scenario
In modern paper production, the drying section of the paper machine plays a vital role in determining the quality, efficiency, and energy consumption of the final product. Maintaining precise temperature control across multiple dryer cylinders is essential to ensure uniform moisture removal and consistent paper characteristics.
System Configuration
Y-AI analog input board for collecting surface temperature data
Y-AO analog output board for regulating steam control valves
Implementation Method
In this application, the Y-AI board is connected to a series of non-contact infrared temperature sensors installed above the dryer cylinder surfaces. These sensors provide real-time temperature feedback in a 0–10V signal format, corresponding to a range of 0–200°C.
The ARMxy controller, running an OpenPLC logic program, dynamically calculates target temperatures for each dryer based on the real-time web (paper) speed. This ensures that the drying process automatically adapts to changes in paper weight (grammage) or line speed, avoiding issues like overdrying or uneven shrinkage.
The Y-AO board outputs precise 4–20mA analog signals to pneumatic actuators that adjust steam control valves feeding each dryer. The system operates in closed-loop mode using valve position feedback to maintain optimal performance and energy efficiency.
Remote Control & Flexibility
Operators and process engineers can remotely access the control logic via the BLRAT remote access tool, allowing them to adjust drying curves and temperature profiles from a central control room or even from a mobile device. This capability enables rapid response to production changes without halting the line or requiring on-site reprogramming.
Key Advantages
Adaptive drying process: Automatically fine-tunes temperatures based on paper speed and grade.
High-precision analog input: Y-series AI boards ensure stable readings even in harsh, high-EMI environments.
Closed-loop control: Valve position feedback improves reliability and control accuracy.
Remote tuning: With BLRAT + OpenPLC, production teams can easily switch between different paper grades or recipes.
Energy efficiency: By reducing overheating and steam waste, the system contributes to lower operational costs and carbon emissions.
