| 摘要 |
PROBLEM TO BE SOLVED: To provide a PLC for efficiently preparing a program, and for stopping and starting the program in the middle. SOLUTION: This PLC 10 is provided with a logic block 81, assigned to the transition of an SFC type program PG1 and a normal time logic block 82, configured of one contact which is turned on when transition conditions are satisfied in the conventional manner. The normal time logic block 82 is configured of a logical arithmetic part 81, with a logical sum that is acquired by adding a reexecution correspondence logic block 83 to the normal time logical block 82. Then, the re-executable correspondence logic block 83 is configured of the logical product of a second contact which is turned on, when a start flag is turned on in the middle and a third contact which is turned on, when the start conditions of individual operations are not satisfied. COPYRIGHT: (C)2008,JPO&INPIT
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