| 摘要 |
<p>PURPOSE:To eliminate vanishing of program and breakage of parts due to erroneous operation by reading and analyzing the content of the memory area of a control program memory section and initializing the program when the program is not registered in the control program memory section. CONSTITUTION:A sequence circuit consists of plural blocks, and in each block branch + contact + contact address enclosed by dotted lines are stored successively in program areas as a word of program from left to right and from up to down in the figure. When the sequence program is stored in the program area, the forefront A of the area becomes SBS branch, and the last of the forefront block becomes an output coil 3. Next block starts with SBS branch and ends with an output coil, and in the last block, as RET instruction word is stored next to the output coil. When the main power source of a controlling device is restored, if program is not registered in an application program area, the content of the memory area of the controlling program is read out and analyzed, and the program is initialized.</p> |
