UR9EV | GE | System time function block

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UR9EV | GE | System time function block

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UR9EV  the time mentioned above, tE, t., and k account for the largest proportion, while the rest of the time is measured to be about 1 ms. If you want to reduce the switching time between primary and backup, you must reduce tE, t, and k. To reduce tE, it is necessary to reduce the number of ET200M slave stations, that is, to reduce the number of I/0 while meeting the requirements. Reduce t. The best method is to choose a faster data synchronization communication method between the primary and backup stations. The Profibus bus method can send more bytes of data in a shorter time compared to the MPI method provided by Siemens PLC. But the former method requires an additional communication module to be configured. K is the PLC cycle scanning cycle, which is related to the length of the user program. A typical medium-sized PLC control system has a limit value range of approximately 150-500 ms for the main backup switching time calculated.

3. UR9EV  synchronization time analysis
In a PLC soft redundancy system, in order for the backup system to take over the main system and continue working when the main system fails, the main controller must send the data that needs to be synchronized to the backup controller during normal operation, so that undisturbed switching can be achieved when a fault occurs.
The data synchronization time refers to the time required for the main station to send synchronized data to the backup station during normal system operation. The data synchronization of Siemens soft redundancy system is carried out multiple times through timed interrupts based on the size of the data volume, and the amount of data synchronized in a single synchronization is the same. The main CPU saves all the data that needs to be synchronized at the beginning of synchronization, and then sends data blocks of the same length to the backup CPU each time. The standby UR9EV  allocates a data block to the corresponding address space every time it receives it. This method evenly allocates time to each execution cycle, avoiding excessive time consumption for sending all data at once. But this also leads to the data obtained by the backup station lagging behind the master station.

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