Senior PLC Programmer
3 days ago
Senior Siemens PLC Programmer (3+ Years)
Location: Sikri, Faridabad, Haryana (onsite with travel to client sites)
Company: Mechatronics International
Department: Controls & Automation
Reports to: Technical Manager / CTO
Type: Fulltime
About Mechatronics International
Mechatronics International is an Indiabased automation company building warehouse, machine, and plant automation solutionsincluding ASRS systems, miniload shuttles, parcel sorters, DWS, and custom machinery. We integrate multidisciplinary technologies (PLC, motion, robotics, IoT) with a customercentric, fastresponse approach.
Role Summary
We're hiring a Senior Siemens PLC Programmer to lead development, testing, and commissioning of PLC/HMI software using TIA Portal for S71200/1500 and WinCC. You will own modules endtoend—from architecture and coding standards to FAT/SAT—ensuring code that's readable, modular, and maintainable across projects.
Key Responsibilities
- Design & Development: Create PLC logic in TIA Portal (LAD/SCL) using IEC best practices, modular FB/UDT patterns, and state machines.
- HMI/SCADA: Develop WinCC (Comfort/Advanced/Unified) screens, faceplates, and diagnostics; ensure command/feedback symmetry and clear alarm texts.
- Drives & Motion: Configure and commission SINAMICS (G120/S120/Startdrive), servo axes, encoders, VFDs; implement safe torque off and speed monitoring where applicable.
- Safety: Implement and validate safety logic on FCPUs and Profisafe devices; collaborate with electrical team on ISO 13849/IEC 62061 compliance.
- Networks & Protocols: Architect and debug PROFINET/Profisafe, OPC UA, Modbus TCP; integrate thirdparty devices (scanners, weighers, barcode/RFID, vision, robots).
- Testing & Commissioning: Plan and execute FAT/SAT, write simulation/test modes, and deliver commissioning checklists and reports.
- Standards & Readability: Enforce company PLC standard (OB1 orchestrationonly; consistent Cmd/Ilk/Sts/Alm interfaces; alarm catalog; constants DB; IO lists).
- Version Control: Export blocks (XML/ST) for Git; maintain changelogs, release notes, and configuration baselines.
- Documentation: Produce IO lists, alarm lists, parameter sheets, and FB headers (Purpose/IO/Assumptions/States/Alarms/Tests).
- Collaboration: Work with mechanical, electrical, and software teams; support panel design reviews and field wiring clarifications.
- Support: Train maintenance teams; provide remote support; drive continuous improvements based on site feedback.
Required Qualifications
- 3+ years handson with Siemens TIA Portal (S71200/1500), WinCC (Comfort/Advanced/Unified), and industrial networking (PROFINET).
- Strong command of Ladder and Structured Text (SCL); comfortable building FBs/UDTs, sequences (FSM), and reusable libraries.
- Experience with SINAMICS drives (Startdrive), VFD/servo commissioning, and motion basics (homing, jogging, speed/position loops).
- Practical knowledge of industrial safety (FCPU, Profisafe IO, Estop/guarding) and standards (IEC 611313; exposure to ISO 13849/IEC 62061 preferred).
- Able to read electrical schematics (EPLAN/AutoCAD), generate IO lists, and collaborate with panel design.
- Proficient in testing/commissioning—fault finding, instrumentation use (multimeter, scope), and structured troubleshooting.
- Clear, structured documentation and communication; ownership mindset and customerfacing professionalism.
Good to Have
- Experience in ASRS, conveyors, sortation, robotics (ABB/KUKA/FANUC integration) or machine vision.
- OPC UA servers/clients, NodeRED/Siemens IOT2050, MQTT, REST APIs, or basic MES/WMS interfacing.
- SCADA dashboards, reporting, and historian basics.
- Exposure to pneumatics/hydraulics, barcode/RFID, weigh scales, and safety relays.
- Familiarity with Git, ClickUp/Jira/Notion, and structured code reviews.
Key Performance Indicators (KPIs)
- Ontime delivery of software milestones (FAT/SAT).
- Code readability and reuse (review pass rate against company standard).
- Commissioning issue closure time and firsttimeright rate.
- Uptime/throughput of deployed systems during warranty.
What Success Looks Like (90 Days)
- Own a module (e.g., pallet shuttle, stacker crane, sorter branch) from design FAT site SAT.
- Establish reusable FB templates and faceplates adopted by the team.
- Improve diagnostic coverage (alarm catalog + "Why Not Running") across one live project.
Work Conditions
- Onsite at Sikri, Faridabad; travel to client sites (domestic; occasional international) for commissioning.
- Flexible hours during commissioning; otherwise standard business hours.
Why Join Us
- Build productiongrade automation used by leading logistics/automotive clients.
- Fast decision cycles, high ownership, and scope to shape standards and tooling.
- Learn across PLC, motion, robotics, and IoT stacks.
How to Apply
Email your resume/portfolio to with subject "Senior Siemens PLC Programmer – Application". Include 2–3 screenshots or exports of your FB/UDT libraries and a brief note on a commissioning challenge you solved.
Notes for Candidates
We assess readability and reliability. Be prepared to discuss your state machine patterns, alarm strategy, and how you ensure OB1 remains orchestrationonly. Bring examples of exported sources (XML/ST) and any libraries you've authored.
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