DECOWELL RS Series I/O Empowers Smart Control System for Photoresist Coating Process

In high-precision industries such as optoelectronics, semiconductors, and microelectronics, the photoresist coating process plays a critical role in photolithography. As the demand for faster product iterations and tighter yield control increases, coating equipment must evolve to feature more intelligent, flexible, and reliable control systems.

Photoresist Coating: Precision Demands Smarter Control

This process involves uniformly applying a functional film to a photosensitive substrate, ensuring accurate pattern transfer during subsequent exposure and development stages. Environmental factors like temperature, humidity, and coating thickness must be continuously monitored and precisely controlled to maintain high-quality results.

In a recent project, the customer adopted a Siemens S7-1200 PLC as the main controller and integrated it with Decowell's RS Series Profinet I/O modules. The system addressed key challenges such as diverse signal types, multiple control points, and space-limited layouts by implementing a decentralized, flexible I/O solution.

Solution Highlights: RS Series I/O Modules + Siemens PLC + Profinet Communication

System Configuration:

• Master Station: 1 × RS-PN2

• Digital Inputs: 4 × 16DI

• Digital Outputs: 4 × 16DO

• Analog Inputs: 1 × 8AI

The entire system communicates via Profinet with the Siemens PLC to gather real-time sensor data and control core equipment such as stir motors, spray units, and heating modules, ensuring optimized coating quality and process stability.

Why Choose Decowell RS Series Distributed I/O?

1. Flexible Distributed Installation
   Modules can be installed near field devices, significantly reducing cable length and wiring time, while streamlining overall deployment.

2. High Compatibility with Mainstream PLCs
   Full support for Profinet protocol allows seamless integration with Siemens and other major PLC systems, reducing development time and ensuring reliability.

3. Precise Control for Critical Process Parameters
   Analog modules monitor key variables like temperature, humidity, and coating thickness to maintain optimal process conditions in real time.

4. Scalable Deployment with Stable Supply Chain
   With an annual volume of over 30,000 units, this solution has been widely adopted across multiple high-end electronic material manufacturing lines with proven stability and performance.

Outcome Summary

By implementing the Decowell RS Series I/O modules, the coating system achieved:

• Real-time monitoring of environmental and process parameters

• Accurate control of multiple actuators

• Modular system design for easier upgrades

• Enhanced coating uniformity and product yield

As intelligent manufacturing accelerates, flexible, scalable, and easy-to-maintain control systems are becoming essential in production line upgrades. Decowell RS Series distributed I/O modules are fast becoming the preferred choice for advanced photoresist coating applications.