VME7807RC350-00780-411000 | GE | Non redundant data block

Description

VME7807RC350-00780-411000 | GE | Non redundant data block

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Among them, VME7807RC350-00780-411000 represents the amount of synchronized data. It is the sum of the length of all redundant data blocks, background data blocks for timers and counters, and non redundant data blocks in the PLC output process image area and bit address area. N is the amount of data transmitted once, depending on the data synchronization method. The Profibus bus method can achieve a transmission rate of 1.5 Mbit/s. Transmit 240 bytes of data every 60 ms. However, Siemens PLC’s built-in MPI method can only transmit 76 bytes of data every 152 ms at a transmission rate of 187.5 Kbit/s. The number of program execution cycles for transmitting data once, i.e
Formula (12)
In the VME7807RC350-00780-411000 , td represents the time for transmitting data once, depending on the data synchronization method; Tob35 is the interval time between timed interrupts.
To reduce data synchronization time, the amount of synchronized data LD should be minimized as much as possible, and a faster data synchronization method should be selected to increase the amount of data transmission N once and reduce the time of data transmission td once. A typical medium-sized PLC control system may have a data synchronization time exceeding 1 second.

4. VME7807RC350-00780-411000
In VME7807RC350-00780-411000 , when a specific fault occurs in the PLC soft redundancy system, the system uses a software redundancy main backup switching mechanism to enable the backup station to take over from the main station and keep the system running after the main backup switching time, avoiding the system from stopping. After the main backup switch is completed, the backup system executes control tasks based on the last complete synchronization data. The copyright of the control engineering network for the main and backup switching function of PLC soft redundancy system is reserved, achieving the goal of improving reliability and reducing costs.

However, due to the long switching time between primary and backup, the system temporarily loses control function during the switching process, making it unsuitable for control scenarios with high real-time requirements. PLC soft redundancy systems are more suitable for process control applications with lower real-time requirements

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