I. Pre-Reset Status Confirmation
Confirm that the restored RC parameters meet the measured standards: filter cutoff frequency deviation ≤10%, target interference attenuation ≥20dB, and RC total time constant ≤200ms.
Confirm that the hot runner is currently in the process stability range, with no temperature jumps or oscillations for 30 consecutive minutes, and that the temperature control accuracy meets production requirements.
Record the final RC reference parameters restored this time and save them to a dedicated process parameter file as a reference for the locking operation.
II. Multi-Level Locking Operation in System Software
Enter the temperature controller's main menu, find the "Signal Filtering Settings" sub-option, and select the "Dynamic RC Filtering Mode" configuration item.
Switch the default "Automatic Adaptation" mode directly to "Manual Locking" mode, and enter the final RC reference parameters restored this time.
After submitting the parameters, select "Enable Hardware Latching." The analog switch of the dynamic RC network will be forcibly fixed at the current position by the hardware, preventing the system from automatically switching parameters from the bottom layer.
Set a dedicated administrator password, allowing only authorized process engineers to modify the lock status, preventing unauthorized personnel from accidentally altering parameters.
Return to the main interface and confirm the status bar displays the "RC Hardware Lock" icon, indicating the software lock operation is officially in effect.
III. Hardware-level Physical Reset Protection
Add a locking DIP switch to the hardware loop of the RC filter network. After calibration, directly switch to the lock position to physically disconnect the dynamic switching circuit, completely eliminating the hardware path for automatic parameter reset by the system.
Replace the ordinary resistors/capacitors in the RC network with high-precision, low-temperature drift components (temperature drift coefficient ≤25ppm/℃), significantly reducing the probability of component drift and unexpected parameter changes at the hardware level.
IV. Closed-Loop Monitoring Verification after Locking
Continuously observe the production process for 2 hours, confirming no RC setting switching logs on the temperature controller and temperature reading fluctuations ≤±0.5℃.
Simulate the maximum interference conditions in the field, confirming the RC lock status was not triggered or changed, and the filtering performance remained stable and met standards.
A new RC lock status monitoring node has been added to the MES system. Once the lock status is abnormally released or the parameters are reset, the system alarm will be triggered immediately to detect the risk at the first time.
