PLC Programming Services
Sysnix develops maintainable PLC programs for new machines, process skids, production lines and retrofit projects. We convert the machine sequence into clear logic with interlocks, alarms, recipes, diagnostics and communication that plant teams can support.
PLC Programming capabilities
- PLC logic development and sequence control
- I/O mapping, interlocks and safety integration
- Legacy PLC migration and program conversion
- Modbus, Profinet, Ethernet/IP and OPC UA connectivity
- Online troubleshooting and cycle-time improvement
- FAT, SAT, backups and commissioning documentation
Typical applications
- Packaging and conveyor lines
- Water and wastewater plants
- Food, pharma and chemical processes
- Automotive machines and assembly stations
- Pumps, compressors, ovens and utilities
- Machine retrofit and control-panel upgrades
Business and engineering outcomes
Maintainable control
Modular sequences, named states, permissives and diagnostics make future troubleshooting safer and faster.
Lower production risk
Interlocks, alarm priorities, recovery paths and tested failure behavior reduce avoidable stoppages.
Migration readiness
I/O mapping, backups and staged cutover planning create a controlled path away from obsolete hardware.
Connected operations
Approved PLC data can feed HMI, SCADA, historians, OEE, traceability and Industrial IoT systems.
Engineering and delivery approach
- Sequence and risk study: Document operating modes, devices, permissives, trips, manual actions, recovery and safe states before coding.
- Control architecture: Define PLC family, I/O, safety interfaces, networks, HMI responsibilities and third-party handshakes.
- Modular engineering: Build reusable equipment modules, alarms, diagnostics, simulation hooks and version-controlled backups.
- FAT to production: Test normal and abnormal sequences, close punch points, commission I/O and hand over verified source files.
Platforms, protocols and components
PLC platforms
- Siemens S7 and TIA Portal
- Mitsubishi MELSEC
- Allen-Bradley Logix
- Schneider Modicon
- Omron and Delta PLCs
Industrial networks
- PROFINET
- EtherNet/IP
- Modbus TCP/RTU
- OPC UA
- CC-Link and serial protocols
Connected systems
- HMI and SCADA
- VFD and servo drives
- Remote I/O
- Barcode and vision
- SQL and edge gateways
What we need to start
- Current PLC backup and software version
- Machine sequence or control philosophy
- I/O list and electrical drawings
- Fault history and production constraints
- Planned shutdown and acceptance criteria
Project deliverables
- PLC source program and backup
- I/O list and alarm list
- Sequence and interlock documentation
- Commissioning and operator handover
Frequently asked questions
Which PLC brands do you support?
We work with Siemens, Mitsubishi, Allen-Bradley, Schneider Electric, Delta, Omron and other common industrial PLC platforms.
Can you modify an existing PLC program?
Yes. We can diagnose, document and improve an existing program when a valid backup and machine access are available.
Do you provide on-site commissioning?
Yes. Projects can include remote engineering, panel testing, FAT, on-site SAT and production support.