PLC/SCADA Software Engineer

Unified Microsystems; Philippines; On-site; PHP 480,000 - 720,000; Full time

Job summary

Unified Microsystems seeks a software-focused automation engineer to develop PLC programs with Siemens TIA Portal V21 and to configure WinCC HMI/SCADA applications. The role emphasizes remote engineering support, FAT testing, and collaboration with project teams to ensure robust, well-documented software solutions.

You will read FDS, SOO, and I/O schedules, design modular PLC code, and maintain version history while supporting commissioning activities and fault troubleshooting.

Qualifications

• Develop PLC application software using Siemens TIA Portal V21.
• Develop, configure and modify WinCC HMI/SCADA applications.
• Review Functional Design Specifications (FDS), Sequence of Operations (SOO), Cause & Effect matrices and I/O schedules before development.
• Collaborate with project managers, controls engineers and commissioning teams.

Responsibilities

• Develop PLC application software using Siemens TIA Portal V21.
• Develop and maintain Siemens S7-1200 and S7-1500 PLC programs.
• Develop, configure and modify WinCC HMI/SCADA applications.
• Review FDS, SOO, C&E matrices and I/O schedules before development.
• Produce modular, reusable PLC software with proper documentation.
• Perform offline testing using PLCSIM where applicable.
• Provide remote support during FAT, commissioning and troubleshooting.

Skills

Siemens TIA Portal

S7 PLC programming

WinCC HMI

Remote support

Documentation

Electrical schematics reading

Tools

S7-1200

S7-1500

WinCC

PLCSIM

Job description

Purpose

The position is responsible for developing, modifying, testing, and maintaining industrial automation software using Siemens technologies. The role is primarily focused on software development and remote engineering support using Siemens TIA Portal V21, Siemens S7 PLCs and WinCC SCADA/HMI platforms. This position does not include electrical design, panel design or site installation responsibilities.

Work Overview

• Develop PLC application software using Siemens TIA Portal V21.
• Develop and maintain Siemens S7-1200 and S7-1500 PLC programs.
• Develop, configure and modify WinCC HMI/SCADA applications.
• Review Functional Design Specifications (FDS), Sequence of Operations (SOO), Cause & Effect matrices and I/O schedules before development.
• Develop modular, reusable and well-documented PLC software.
• Perform offline software testing using PLCSIM where applicable.
• Support Factory Acceptance Testing (FAT) remotely.
• Provide remote software support during commissioning and troubleshooting.
• Maintain software version control, backups and revision history.
• Prepare software documentation, testing records and change logs.
• Collaborate with project managers, controls engineers and commissioning teams.
• Ability to read and interpret electrical schematics, control panel drawings, wiring diagrams, P&IDs and I/O schedules.
• Sound understanding of industrial electrical control systems, including AC/DC circuits, relays, contactors, motor starters (DOL/reversing), analogue/digital I/O, protection devices, residual current protection (RCD/RCCB), and fail-safe control principles.
• Working knowledge of electrical fault-finding, circuit theory, and industrial troubleshooting techniques to support PLC software development, testing and commissioning.