05701-A-0512 Modbus接口模块套件RS422/485

Description

05701-A-0512      Modbus接口模块套件RS422/485

05701-A-0512      Modbus接口模块套件RS422/485

High speed of data exchange with external devices. The PLC module exchanges data through the system bus (generally done on the printed circuit of the substrate) and the various I/O modules, special function modules, communication modules installed on the substrate, etc. The more modules installed, the more time the data exchange between the modules and those modules will increase. This industry is especially good at hardware such as devices and circuit boards, so the miniaturization on the PLC system, the increase in the time of data exchange, to a certain extent, will make the PLC scan time longer. Therefore, it is necessary to take the following measures to make the system bus transmission speed: increase the bandwidth of the system bus to increase the amount of data transmitted once, such as Mitsubishi Electric’s small Q series PLC, increase the bandwidth of the system bus, so that the amount of data transmitted is twice the previous; In the system bus access mode, the continuous group transmission technology is used to realize the high-speed batch transmission of continuous data, which greatly reduces the time required to access each word. Through the global transmission to the module connected with the system bus, that is, the same data is transmitted to multiple modules at the same time, and the system bus is effectively used.

High speed of programming device service processing. When scan times are tens of milliseconds, a few milliseconds of programming tools and device service processing times pose little problem. However, when performing control tasks under 1 millisecond, it is necessary to reduce this time significantly. The method adopted is to carry out this kind of processing in the way of multi-chip parallel processing, by the microprocessor chip specializing in processing programming and services, in order to reduce the impact on the chip executing the control program, so that it can only perform cis and logical operations. In addition, in order to improve the efficiency of service processing, shorten the time of reading and writing programs in the field, in order to shorten the operation time, high-speed serial communication (large baud rate of 115.2Kbps) and UCB port (large baud rate of 12Mbps) into the PLC module, so as to achieve high-speed communication between programming tools and equipment. It also allows the simultaneous use of these two communication ports for simultaneous programming and debugging by multiple people.