The PLC controller acts as the core control unit for the Class H system. It manages all automatic movements and safety checks during each test cycle. When the operator loads a specimen and selects the test settings, the PLC handles the pendulum lift, monitors the starting angle and confirms that the enclosure is closed before any motion begins. This keeps operator actions simple while the internal logic maintains consistent test conditions.

During the strike, the PLC tracks the pendulum’s release, movement and return path. It ensures that the swing completes correctly and that the pendulum comes back to a safe locked position after the impact. Because the PLC executes the sequence the same way each time, the machine repeats tests with high consistency, even in busy labs.

The controller also manages communication with the touch screen and optional software. It provides stable data for the digital and analog readouts and ensures that the operating sequence remains reliable over thousands of tests.

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