Hello everyone! I'm back to answer your questions again! If you like our content, please follow our subscription account (see the link below the article)! Let's get straight to the point! 1. How compatible is Step7-Micro/WIN? Currently, the most common Micro/WIN versions are V4.0 and V3.2. Older versions, such as V2.1, are no longer useful except for converting old project files. Different versions of Micro/WIN generate different project files. Higher versions of Micro/WIN are backward compatible with project files generated by lower versions; however, lower versions cannot open project files saved by higher versions. It is recommended that users always use the latest version, currently Step7-Micro/WIN V4.0 SP9. 2. How to set the communication port parameters? By default, the UN200CPU (Yiwei CPU) communication port is in PPI slave mode, with address 2 and communication rate of 9.6K. To change the communication port address or communication rate, you must set it in the Communication Ports tab of the system block, and then download the system block to the CPU for the new settings to take effect. 3: How to configure communication port parameters to improve network performance? Assume a network has stations 2 and 10 as master stations, with station 10's highest address set to 15. For station 2, the address gap is the range from 3 to 9; for station 10, the address gap is the range from 11 to the highest address 15, also including stations 0 and 1. Master stations in the network exchange tokens, controlling communication activities on the entire network independently in a time-sharing manner. Not all master stations join the token-passing loop simultaneously; therefore, a master station holding a token must periodically check if a new master station has joined at an address with a higher address than itself. The refresh factor refers to the number of times a token is obtained before checking for a higher address. If an address gap factor of 3 is set for station 2, then when station 2 obtains its token for the third time, it will check an address in the address gap to see if a new master station has joined. Setting a larger factor will improve network performance (because there are fewer unnecessary address checks), but it will affect the speed at which new master stations join. The following settings will improve network performance: 1) Set the highest address closest to the actual highest station address. 2) Arrange all master station addresses consecutively, thus avoiding new master station detection in address gaps. 4: How to set the data retention function? The data retention setting defines how the CPU handles the data retention task for each data area. The data area selected in the data retention setting area is the data area whose data content you want to "retain". "Retention" means whether the content of the data area remains in the state before power failure after the CPU is powered off and then powered on again. The data retention function set here is implemented in the following ways: The data retention function set here is implemented by the CPU's built-in supercapacitor. After the supercapacitor has discharged, if an external battery card is installed, the battery card will continue to supply power for data retention until the discharge is complete. The data is automatically written to the corresponding EEPROM data area before power failure (if MB0-MB13 are set to retention). 5: What is the relationship between data retention settings and EEPROM? If the memory cells in the range of MB0-MB13 (14 bytes) are set to "Keep", the CPU will automatically write their contents to the corresponding areas of the EEPROM when power is off, and overwrite these memory areas with the contents of the EEPROM after power is restored. If the range of other data areas is set to "Do Not Hold", the CPU will copy the values ​​in the EEPROM to the corresponding addresses after power is restored. If the data area range is set to "Keep", if the built-in supercapacitor (+ battery card) fails to hold the data, the contents of the EEPROM will overwrite the corresponding data area; otherwise, it will not overwrite. 6: What types of passwords are there? Set a CPU password in the system block to restrict user access to the CPU. Passwords can be set at different levels to grant different levels of access to other users. 7: Why can't I see that the CPU password has taken effect after setting it? After setting the CPU password in the system block and downloading it, because you still maintain the communication connection between Micro/WIN and the CPU, the CPU will not protect the Micro/WIN that set the password. To verify the validity of the password, you can: 1) Stop the communication between Micro/WIN and the CPU for more than one minute 2) Close the Micro/WIN program and then open it again 3) Stop the power supply to the CPU and then turn it on again 8: Do digital/analog signals have a freeze function? The digital/analog output table specifies how the digital output points or analog output channels should operate when the CPU is in the STOP state. This function is very important for some devices that must maintain operation. For example, brakes or some key valves, which are not allowed to stop operating when debugging the PLC, must be set in the output table of the system block. Digital signal: After selecting "Freeze output in last state", the last state is frozen. When the CPU enters the STOP state, the digital output point will remain in the state before the stop (if it is 1, it will remain 1; if it is 0, it will remain 0). At the same time, the b. table below will not work. If it is not selected, the selected output point will remain in the ON (1) state, and the unselected one will be 0. Analog Input: When "Freeze output in last state" is selected, the last state is frozen. When the CPU enters STOP state, the analog output channels will retain their state before the shutdown. The table below will not function. When not selected, the output values ​​of each analog output channel in the table below will be displayed when the CPU enters STOP state. 9: What is the function of the digital input filter, and how is it set? Different input filtering times can be selected for the digital input points on the CPU. If the input signal has interference or noise, the input filtering time can be adjusted to filter out the interference and prevent malfunctions. The filtering time can be selected from several levels within the range of 0.20~12.8ms. If the filtering time is set to 6.40ms, the CPU will ignore the effective level (high or low) duration of the digital input signal if it is less than 6.4ms; it will only recognize it if the duration is longer than 6.4ms. (Password: Trust, from quality) Additionally: Input points supporting high-speed counter functions are not subject to this filtering time constraint when the corresponding function is enabled. Filtering settings are effective for refreshing the input image area, interrupting switch inputs, and pulse capture functions. 10: What are the effects of analog input filtering? Generally, using the UN200CPU's analog filtering function eliminates the need for separate user-defined filtering programs. If analog filtering is selected for a channel, the CPU will automatically read the analog input value before each program scan cycle. This value is the filtered value, representing the average of the set number of samples. The analog parameter settings (number of samples and dead zone) apply to all analog signal input channels. If no filtering is applied to a channel, the CPU will not read the average filtered value at the start of the program scan cycle; instead, it will directly read the actual value when the user program accesses that analog channel. If you like this article, scan the QR code to follow us!