| 摘要 |
PURPOSE:To convert successively to Boolean algebra to reduce the trouble by noticing the characteristic of the ladder sequence chart to perform operation processings in parallel from one bus side to the other faithfully to the ladder sequence chart. CONSTITUTION:In case of programming, programs are generated in every row unit from the left to the right of the ladder sequence chart, namely, from the side of one bus A to the side of the other B. Programs of the ladder sequence chart are as shown in a figure, and generated and stored programs are read out successively to execute operationed processings. That is, the operand part of an address (i) is given to an input part 4, and input data of the contact of address 1 is given to an input register 6 through a signal line (k). A control part 3 discriminates a read instruction to apply a shift signal (b) to the input register 6. Hereafter, the read instruction is executed up to address i+3 similarly; and when the execution reaches address i+4, the control part 3 discriminates a following state generating instruction. At this time, a switch 8 selects a contact vector in the input register 6 and inputs it to an AND.OR operator 9. |
