| 摘要 |
<p>PURPOSE:To ensure the smooth debug, etc. and also to decrease greatly the number of processes to complete a sequence program, by checking whether or not >=2 writing instructions accompanied by the same operand exist. CONSTITUTION:A processor 11a searches a writing instruction from the first of a sequence program. If said instruction is decided, it is checked whether an operand caused by the writing instruction is used or not by another subsequent writing instruction. If the operand is used by another writing instruction, it is decided that a program mistake exists. This fact is informed to a display device 13 or a printer 12. Thus it is possible to perform the debug, etc. smoothly and also to decrease greatly the number of processes to complete a sequence program.</p> |
