Job Description
PLC & SCADA Engineer
The PLC & SCADA Engineer is responsible for the design, programming, testing, commissioning,
troubleshooting, and maintenance of PLC, HMI, and SCADA systems for water and wastewater treatment
plants. The role involves integrating instrumentation, electrical systems, VFDs, analyzers, and field
devices to ensure reliable plant operation and compliance with project specifications.
Key Responsibilities
Engineering & Design
• Design PLC control systems for water and wastewater treatment plants.
• Develop PLC software in accordance with project specifications and functional design
documents.
• Design and configure SCADA and HMI applications for plant monitoring and control.
• Prepare control philosophies, I/O lists, network architecture, and automation documentation.
• Review P&IDs;, electrical drawings, and control panel drawings.
PLC Programming
• Develop PLC programs for treatment processes:
• Configure communication protocols such as:
o Modbus RTU/TCP
o Profibus
o Profinet
o Ethernet/IP
o OPC
SCADA Development
• Develop graphical SCADA screens.
• Configure alarms and event logging.
• Configure historical trending and reporting.
• Implement user access levels and security.
• Integrate PLCs with SCADA servers.
Commissioning
• Perform FAT (Factory Acceptance Test).
• Perform SAT (Site Acceptance Test).
• Commission PLC and SCADA systems at site.
• Conduct I/O testing and loop checking.
• Troubleshoot automation and communication issues.
• Support plant start-up activities.
Instrumentation & Electrical Coordination
• Interface with field instruments including:
o Flow meters
o Pressure transmitters
o Level transmitters
o pH analyzers
o Conductivity analyzers
o DO analyzers
o Turbidity analyzers
o Chlorine analyzers
• Coordinate with electrical and mechanical teams during installation and commissioning.
Documentation
• Prepare:
o Functional Design Specifications (FDS)
o Operation Manuals
o Commissioning Reports
o As-built Documentation
o