Q: Is it equivalent to the role of an MPI cable?
A: Here you mix the dedicated network connector with the Siemens communication protocol. They are two different concepts: the DP bus connector with programming port is just a network connector, and MPI is a communication protocol; generally in plc The MPI port is installed with a DP bus connector for uploading, downloading or monitoring the PLC of the program.
First of all, the physical layer of PPI communication, MPI communication and PROFIBUS-DP fieldbus communication of Siemens plc is PR-485 communication, and all the same communication cable and special connector are used. Siemens offers two network connectors, a standard network connector and a programming port connector, while the programming port allows the programming station or host computer to be connected to the network without interfering with any existing network.
MPI is a confidentiality protocol developed by Siemens for PLCs. Therefore, Siemens PLCs have an MPI interface. The network generated by the PG/PC through the MPI interface can access all the intelligent modules on the connected hardware stations.
However, the DP bus connector with programming port is only a connector with a programming port, which can be used as a standard standard network connector for the connector between the DP slaves, and more for the MPI port installed in the PLC. Upload, download programs and monitor PLCs.
Open your hardware configuration interface, double-click the corresponding CPU, and its property interface appears. In the sub-item "Communication", the PLC operating system automatically reserves a connection resource for the PG or PC, which can be connected to the PLC at any time. The MPI interface does not affect network communication.
With the rapid development of wireless sensing technology, 433 MHz wireless communication devices have been more widely used in portable devices, vehicle-mounted terminals, intelligent locks and other fields [1]. As an important part of wireless communication equipment, antenna is a key component that affects the overall performance of the communication system [2].
Domestic and foreign scholars have been exploring the 433 MHz printed antenna with high gain and miniaturization for many years. However, there are two main trends in the design of 433 MHz printed antenna by previous scholars: one is to sacrifice size to ensure high gain, such as the structural scheme in literature [3]; The other is to sacrifice gain to ensure size miniaturization, such as the scheme in reference [4].
Taking into account the effective size and gain characteristics of the antenna is the difficulty in the design of 433 MHz miniaturized printed antenna. Based on the research experience of domestic and foreign scholars on 433 MHz printed antenna, a 433 MHz miniaturized spiral printed antenna is designed based on the 1/4 wavelength monopole antenna. The simulation results show that the antenna occupies only 20×35 mm2 and the effective gain is -4.14 dB.
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