We are seeking an experienced PLC Engineer with approximately 3 years of hands-on experience in designing, programming, commissioning, and supporting PLC/HMI/SCADA solutions for commercial and industrial Building Management Systems. The ideal candidate will have expertise in both Allen-Bradley and Siemens PLC platforms.

Key Responsibilities

Design & Programming
: Develop, modify, and troubleshoot PLC logic (Ladder, FBD; SCL/STL as needed) for BMS sequences of operation
HMI/SCADA Development
: Configure and integrate HMI/SCADA screens, alarms, data logging, and user security
Commissioning
: Commission BMS field devices including sensors, actuators, VFDs (PowerFlex, Danfoss), motor starters, valves, and dampers
System Integration
: Integrate third-party systems using BACnet/IP, Modbus TCP/RTU, Ethernet/IP, PROFINET/PROFIBUS, and OPC UA protocols
Documentation
: Create control narratives, I/O lists, point schedules, and test/commissioning plans; maintain as-built documentation
Testing & Troubleshooting
: Perform site FAT/SAT, startup, and functional performance testing; diagnose controls, electrical, and networking issues
Project Coordination
: Interface with mechanical/electrical contractors, TAB, and commissioning agents; support RFIs and change orders
Compliance
: Implement safety practices (UL 508A, NEC/NFPA 70, NFPA 70E, local codes) and company QA/QC standards
Optimization
: Trend/analyze system data to optimize energy usage and comfort; implement sequence tuning and PID loop optimization
Support & Training
: Provide end-user training and post-commissioning support; participate in on-call rotation as needed

Required Qualifications

Bachelor's degree in Electrical/Controls/Mechanical/Mechatronics Engineering or equivalent experience
~3 years hands-on PLC programming and commissioning experience with:
Allen-Bradley (ControlLogix/CompactLogix, Studio 5000) and/or Siemens (S7-1200/1500, TIA Portal)
Experience with BMS/controls for HVAC equipment (AHUs, chillers, boilers, cooling towers, heat exchangers)
Proficiency with HMI/SCADA development (FactoryTalk View or WinCC)
Solid understanding of BACnet and Modbus mapping, device discovery, and interoperability
Ability to read/mark up P&IDs, electrical schematics, and mechanical plans
Strong troubleshooting and documentation skills

Preferred Qualifications

Familiarity with Niagara/Tridium, Ignition, or other SCADA platforms
Experience with energy metering, demand response, or analytics platforms
VFD parameterization, harmonics mitigation, and EMC best practices
Scripting (Structured Text), version control (Git), and basic Python
OSHA-10/30, LEED awareness, or commissioning certifications

Tools & Technologies

PLC Platforms
: AB ControlLogix/CompactLogix; Siemens S7-1200/1500
Software
: Studio 5000/RSLogix, TIA Portal/Step 7, FactoryTalk View, WinCC, AutoCAD/EPLAN
Protocols
: BACnet/IP, Modbus TCP/RTU, Ethernet/IP, PROFINET/PROFIBUS, OPC UA
Diagnostic Tools
: Wireshark, Advanced IP Scanner, multimeter, loop calibrator, scope

Success Metrics

On-time commissioning and handover with zero safety incidents
High point-to-point completion and defect closure rates
Reduction in call-backs through quality workmanship
Documented energy/comfort improvements from sequence tuning
Up-to-date as-builts and effective knowledge transfer to operations

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