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Example - Ladder Diagram

ATV​


IMPORTANT: The ATV instruction behaves as follows:

  • The ATV instruction switches the mode (Standby(Backup)/Active) between the primary and secondary CPU of the redundant system.
  • Once the instruction is executed, the activated system will be switched into a standby (backup) mode.
    • The other system, which was in standby (backup) mode, will be switched into active mode.
  • The ATV instruction is operated only once when the execution condition is ON (1).