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The Main Functions and Design Scheme of the Lab Bench Control System:
1. Utilizing a closed-loop control system, operational information is collected through sensors and other acquisition systems. The collected data is then input into the computer via a data acquisition card, where it is displayed and calculated according to control requirements. The control signals are output, processed by the data acquisition card into signals recognizable by the actuator, and finally, system control is achieved through the actuator's operation.
2. Utilizing a centralized computer control system with PLC hardware and the Windows operating system as the software platform. During the signal collection process, we gather both digital and analog signals. Therefore, we first need to convert the analog signals into digital signals that the PLC can process. After processing by the PLC, some of the output signals are then converted back into analog signals to control the experimental bench. This requires both A/D and D/A conversions. Hence, an integrated data acquisition card with both functions is needed to accomplish these conversions.