| 摘要 |
PURPOSE:To find contradictions between output relays and to make fail safe and error check of an input part possible by providing a programmable controller with a data storage part for output check. CONSTITUTION:The programmable controller having an input part 1, an output part 3, a program memory part 5, a data memory part 2 where states of relays or the like are held and an operating part 4 is provided with a data storage part 607 for output check. Data which designates a group of output relays and one, at least, of a maximum allowable energizing number and a minimum essential energizing number in this group are stored in the storage part 607, and it is checked whether an actual energizing number is within the designated range or not after the output operation and before the arithmetic operation. Thus, contradictions between output relays are found to lead actual outputs to the safety side, and errors of programs and the input part are checked. |
