The free port communication of Siemens S7-200plc has very powerful functions. It is convenient to use the free port communication to realize the data exchange between PLC and other intelligent devices. The use of free port communication requires the following programming settings: set port selection for SMB30, baud rate selection, check settings, set buffer for SMB87, 89, 90, 94, etc. Interrupt settings are made by the ATCH instruction to determine the interrupt status. Receive data by RCV instruction.
Communication exchange data
The exchange of data is done through the COM port, so be sure to pay attention to the address usage and time usage of the communication port. In addition, the data buffer definition is also very important, because the exchanged data will be stored directly in this buffer.
Communicate with other smart devices
When the S7-200 communicates with other intelligent devices, the corresponding protocol is generally adopted. Generally, a network will have a corresponding station address, and the master station and the slave station must distinguish the problem.
The Digit LED Display is one type of display screen. By inputting relative current to its different pins, it will light up, so as to display all the parameters that can be represented by numbers, such as time, date, temperature, etc.
Because of its low price and simple use, it is widely used in electrical appliances, especially in the field of household appliances, such as air conditioners, water heaters, refrigerators, etc. Most water heaters use Digit LED Display, and other household appliances also use LCD and fluorescent screens.
led display,different color ,wide usage ,High intensity and reliability
Wuxi Ark Technology Electronic Co.,Ltd. , https://www.arkledcn.com