| 摘要 |
PROBLEM TO BE SOLVED: To achieve a synchronization control function without providing a bus dedicated for synchronization control by using a bus (system bus) used to transmit and receive data between units from the prior art. SOLUTION: When a timer interruption occurs during the execution of a process performed in a normal cyclic, a CPU unit interrupts the process and transmits synchronization data by collective addressing using the system bus to other synchronization units performing the synchronization control. The synchronization unit executes a synchronization cycle upon the reception of the synchronization data by collective addressing as a trigger, acquires the received synchronization data with the start of the synchronization cycle, and performs a refresh process (a) of the synchronization data of IN data after executing an input/output process. The CPU unit performs the refresh process of the synchronization data of the IN data (b), and obtains the synchronization data to be transmitted next by a synchronization interrupts task process (c). The synchronization unit constantly acquires the most recent synchronization data and simultaneously operates. COPYRIGHT: (C)2010,JPO&INPIT
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