jobapplier

Senior PLC Software Engineer

Sioux High Tech Software Ltd.

Responsibilities

  • Design and develop PLC programs to IEC 61131-3 (Structured Text, Ladder, Function Block Diagram, SFC) on platforms such as Beckhoff TwinCAT 3, Rockwell.
  • Semiconductor integration and compliance Implement host communication with SECS/GEM (SEMI E5, E30), GEM300 (E40, E87, E90, E94) and, where needed, Interface A / EDA (E120, E125, E132).
  • Integrate with AMHS/OHT, E84 load-port handoff and fab MES interfaces.
  • Design safety interlocks and ensure compliance with SEMI S2 / S8 and functional safety standards (IEC 61508, ISO 13849), including safety PLCs and TwinSAFE or PROFIsafe.
  • Testing and commissioning Write and run unit, integration and simulation tests, including virtual commissioning and hardware-in-the-loop.
  • Lead software parts of FAT and SAT, and commission tools at customer sites in Taiwan, including cleanroom work.
  • Troubleshoot field issues, carry out root-cause analysis (8D, FMEA) and deliver fixes under tight fab uptime targets.

Preferred

  • Solid experience working with C#, .NET is a great plus as well.
  • Experience with HMI development , EtherCAT , OPC UA , and industrial automation.
  • Familiarity with PackML , machine diagnostics, and recipe management is an advantage.

Key Responsibilities

Build modular, reusable libraries and state machines for motion, robots, load ports, valves, pumps, heaters and gas panels. Implement motion control for servo axes, stages and wafer-handling robots over EtherCAT, PROFINET, CC-Link IE or EtherNet/IP. Develop alarm handling, recipe management, data logging and HMI interfaces with the equipment controller or tool software.

Ideal Profile

Master's or Bachelor's Degree in Automation Control, Electrical Engineering, Mechatronics, Computer Engineering, or a related discipline. 5+ years of hands-on PLC software development for industrial machines, including at least 2 full projects from design to commissioning. Experience in PLC programming with Beckhoff TwinCAT or Rockwell Strong knowledge of IEC 61131-3 (Structured Text) .

Good problem-solving skills and ability to work in an international team. Fluent English communication skills.