PLC & SCADA Engineer

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 Backup of PLC and SCADA programs
• o Technical Reports

Required Technical Skills

PLC Platforms

• Siemens (S7-1200, S7-1500, TIA Portal) ,(S7-300,S7-400H)
• Allen-Bradley (Rockwell)
• Schneider Electric
• Mitsubishi
• Omron (preferred)

SCADA Platforms

• Siemens WinCC TIA PORTAL
• FactoryTalk View
• WinCC Unified (preferred)
• WINCC SCADA

HMI

• Siemens Comfort Panels
• Weintek

Software

• Siemens TIA Portal
• WinCC
• AutoCAD
• Microsoft Office

Preferred Experience

Candidates with experience in the following will be highly preferred:

• Wastewater Treatment Plants (WWTP)
• Sewage Treatment Plants (STP)
• Water Treatment Plants (WTP)
• Reverse Osmosis (RO) Plants
• UF/MBR Systems
• Pumping Stations
• Industrial Water Treatment
• Desalination Plants

Key Competencies

• PLC Programming
• SCADA Development
• Automation System Design
• Process Control
• Instrumentation
• Electrical Troubleshooting
• Commissioning
• Industrial Networking
• Problem Solving
• Teamwork
• Communication Skills
• Time Management

Preferred Certifications

• Siemens Certified Programmer
• Rockwell Automation Certification
• Schneider Electric Automation Certification
• ISA Certified Automation Professional (CAP) (preferred)
• Valid UAE Driving License (preferred)