Difference: 1. The upper computer plays the main control role in the system, mainly as the planning control of the system and belongs to the decision-making layer; while the lower computer is the specific execution layer and mainly completes the tasks assigned by the system planning layer. 2. The upper computer refers to the computer that people can directly issue control commands, while the lower computer is the computer that directly controls the equipment to obtain the equipment status.
The operating environment of this tutorial: Windows 7 system, Dell G3 computer.
What is a host computer?
The host computer refers to a computer that can directly issue control commands.
It is usually PC/host computer/master computer/upper computer.
The screen displays various signal changes (hydraulic pressure, water level, temperature, etc.).
What is a slave computer?
The slave computer is a computer that directly controls the device to obtain the device status.
It is usually a PLC/single chip microcomputer/slave computer/lower computer or the like.
The difference between the upper computer and the lower computer
The upper computer plays the main role in the system, mainly serves as the planning control of the system and belongs to the decision-making layer.
Lower computer: The specific execution layer mainly completes the tasks assigned by the system planning layer.
The host computer refers to a computer that people can directly issue control commands, usually a PC. Various signal changes (hydraulic pressure, water level, temperature, etc.) are displayed on the screen. The command issued by the upper computer is first given to the lower computer, and then the lower computer interprets the command into the corresponding timing signal to directly control the corresponding equipment.
The slave computer is a computer that directly controls the device to obtain the device status, usually a PLC/single-chip microcomputer or the like. The lower computer reads the device status data (generally analog) from time to time and converts it into a digital signal to feed back to the upper computer.
In short: Both the upper and lower computers need programming and have special development systems.
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