Industrial PLC Programming & Control Systems
Robust, deterministic PLC software engineering for manufacturing lines and machinery. Clean, well-documented IEC 61131-3 logic tailored for Siemens, Allen-Bradley, Delta, and Omron controllers.
Structured IEC 61131-3 Code Standards
Every program is developed with modular state machine logic, full fault diagnostics, and clear variable naming.
Specialized Industrial Automation Engineering
Solving complex field execution challenges across legacy migrations, synchronized multi-axis motion, and industrial networks.
Legacy PLC Retrofits & Code Conversion
Migrating obsolete PLCs (Siemens S7-200/300, Allen-Bradley SLC 500/MicroLogix) to modern platform architectures (S7-1200/1500, CompactLogix) without downtime or loss of machine sequence logic.
Multi-Axis Servo & VFD Motion Control
Precision pulse-train (PTO), EtherCAT, and Profidrive synchronization for servo motors, stepper drives, and variable frequency drives used in high-speed packaging, conveyors, and positioning indexers.
Fieldbus Topology & Deterministic Networks
Design and troubleshooting of robust industrial communication networks including Profinet RT/IRT, Modbus RTU/TCP over RS485, EtherNet/IP, and CANopen for distributed remote I/O islands.
Safety PLC & Emergency Interlock Engineering
Programming Fail-Safe CPUs (Siemens F-CPUs, GuardLogix) according to ISO 13849-1 and SIL 3 standards to manage light curtains, safety gates, and dual-channel emergency stop circuits.
PLC Engineering Capabilities
| Automation Layer | Engineering Scope & Deliverables | Industry Standard |
|---|---|---|
| Supported Hardware | Siemens S7-1200/1500, Allen-Bradley ControlLogix, Delta DVP | IEC 61131-3 |
| Programming Languages | Ladder Diagram (LD), Structured Text (ST), Function Block (FBD) | ANSI / ISA-88 |
| Fieldbus Communications | Profinet, EtherNet/IP, Modbus RTU/TCP, CANopen | IEEE 802.3 |
| Safety Logic & SIL | Fail-safe PLCs, Safety Integrated Functions, Emergency Stop Loops | ISO 13849-1 / SIL 3 |
| Motion & VFD Control | Servo synchronization, PTO pulse train, VFD speed ramps over RS485 | IEC 61800 |
4-Step PLC Software Lifecycle
Functional Specification
Detailed mapping of operational sequences, I/O lists, state machine diagrams, and interlock rules.
IEC Code Development
Modular, reusable PLC programming structured into function blocks (FB) and user-defined data types (UDT).
Dry-Run & Simulation
Virtual commissioning using PLC SIM and digital-twin emulation to test fault handling before field deployment.
On-Site Commissioning
I/O loop tuning, drive optimization, live production trial runs, and complete operator training.
PLC Programming FAQs
Can you modify legacy PLCs without original source documentation?
Yes. We can upload existing compiled runtimes from legacy controllers (such as Siemens S7-300 or Allen-Bradley SLC 500), perform hardware wire tracing, reconstruct tag names, and re-document the program for modern migration.
Do you provide un-passworded PLC source code upon project completion?
Absolutely. We provide full, unlocked ownership of all PLC project files, HMI runtime archives, CAD schematics, and cross-reference tag lists upon project handover.
Let's execute your next industrial milestone.
From initial engineering architecture blueprints to final field commissioning, JFATA Engineering maps directly to your complex automation requirements. Select a specialized service track below to initiate formal project consultation with our engineering team.