中文版
Description
Technical Specifications 81EU01E-E
Generally, the power module is inserted in the first slot with the number 0, the PLC is inserted in the second slot, and the input and output modules of various types are inserted in the other slots. A printed circuit board with connectors is installed on the back of the guide rail of the I/O module to connect the slots that are inserted into the I/O module. The upper and lower parts of the slots can make the inserted modules line up. A guide with an I/O module and processor is called a local I/O guide. Remote I/O rails with I/O modules, power supplies, remote I/O communication cards and installed far away from the local I/O rails are called remote I/O rails. The number of remote I/O rails depends on the number of variables that different processors can control. The communication between the remote I/O guide rail and the processor can be realized in a variety of ways, including coaxial cable, biaxial cable, shielded twisted pair, etc. If the distance is relatively long and the problem of noise suppression needs to be considered, optical fiber communication can be adopted.
Parallel I/O module assumes the important responsibility of information and data interaction with external systems, and can be used to expand peripheral devices, such as keyboard, LED and other simple external devices.
Generally speaking, the 51 MCU has four 8-bit parallel I/O ports, which are P0, PI, P2 and P3. PO and P2 can be used as both common I/O ports and data address ports, while P3 can be used as common I/O ports and has other (second) functions. Only PI can be used as common I/O ports. The figure shows the external pin structure diagram of 51 microcontroller.
Parallel I/O port PO ~ P3 is supported by addressing the operation, all have certain current ability, can drive some external devices, but since the PO is open drain output structure, so as a regular I/O pins when need plus pull resistance.
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81EU01E-E
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