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Main Functions and Design Scheme of the Laboratory Bench Control System:
1. Utilizing a closed-loop control system, information from the system operation is collected via sensors and other acquisition systems. The collected data is then input into a computer via a data acquisition card, where it is displayed and calculated according to control requirements. Subsequently, 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 movement.
2. Utilizing a centralized computer control system with PLC as the hardware and the Windows system as the software platform, during the signal collection process, we gather both digital and analog signals. Consequently, we must first convert the collected analog signals into digital signals that the PLC can process. After processing by the PLC, a portion of the output signals need to be converted back into analog form to control the laboratory bench. This necessitates both A/D and D/A conversions. Therefore, we employ a data acquisition card that integrates both functions to accomplish these conversions.