Many manufacturing units in Coimbatore and South India operate legacy machinery that remains mechanically sound but suffers from outdated electromechanical relay controls, frequent electrical failures, and zero production data logging. Machine retrofitting with modern PLCs and HMIs provides a cost-effective path to modern automation.
1. Phase 1: Machine Inspection & I/O Mapping
Audit existing sensors, limit switches, solenoids, motors, and safety interlocks. Create a comprehensive digital and analog I/O point schedule determining the required PLC input/output expansion modules.
2. Phase 2: Control Panel Rewiring & PLC Selection
Remove obsolete relay logic and install a compact control cabinet housing a Siemens, Delta, or Schneider PLC, 24V DC power supply, DIN-rail terminal blocks, and Variable Frequency Drives (VFDs) for motor speed control.
3. Phase 3: HMI Interface & SCADA Telemetry
Mount a touch-screen HMI (7" or 10") on the machine frame to allow operators to adjust process parameters, view active alarms, and log hourly production counts directly into a centralized SCADA dashboard via Modbus/Ethernet.
| Retrofit Phase | Engineering Task | Key Performance Improvement |
|---|---|---|
| Audit & Mapping | Trace electrical wiring & build I/O map | Eliminates unknown wiring faults |
| Cabinet Rewiring | Install PLC, VFDs & DIN terminals | Reduces electrical panel footprint by 60% |
| PLC Programming | Develop ladder logic & safety loops | Eliminates relay contact wear & cycle delay |
| HMI & SCADA | Configure touchscreen UI & Modbus TCP | Enables real-time hourly telemetry monitoring |
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