How PLC and HMI Divide Roles
• PLC (Programmable Logic Controller): The industrial computer that executes real-time ladder logic, reads sensors (limit switches, thermocouples, and pressure transducers), controls proportional valves, manages heater bands, and enforces safety interlocks (such as rear and front safety gates).
• HMI (Human-Machine Interface): The operator touch-screen terminal that communicates with the PLC via Ethernet or serial ports to display machine status, input temperature setpoints, adjust pressure/speed profiles, and log alarms.
Core Machine Operations Controlled
• Temperature Control: Regulates barrel heating zones (typically 3–5 zones) using thermocouple feedback and PID loops.
• Clamping & Ejection: Manages mold closing, high-pressure clamping force, mold opening, and part ejection sequences.
• Injection & Charging: Controls screw translation, velocity/pressure profiles during material injection, and screw rotation for plastication (charging).
• Safety & Alarms: Prevents motor start-up or mold closure if safety gates are open, and triggers acoustic or visual alerts for faults like cool-down prevent timers.
Common Controller Brands
• Porcheson: Widely used dedicated injection molding PLC/HMI controller systems (e.g., Porcheson 300MA) MS300 MS500 MS700 MK210A.
• Techmation: Popular specialized injection molding controller and display units.
• KEBA: High-performance industrial injection molding controller series (e.g., Keba i2000 with EtherCAT).
• General Industrial PLCs: Delta, Mitsubishi, and Siemens platforms configured with custom analog I/O and touch panels for specialized or retrofitted machines.
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