| 摘要 |
PROBLEM TO BE SOLVED: To provide a controller which can effectively use a memory without increasing a node address more than necessary for allocating the memory. SOLUTION: For an I/O memory 11b in a CPU unit 11 composing a PLC 10 connected to a network in which a slave of small point number having input-output point number of two or below and a multiple point slave having 16 points are mixed, a memory area for multiple point OUT data, a memory area for multiple point IN data, a memory area for small point number OUT data, and a memory area for small point number IN data are respectively prepared in correspondence with four kinds of slaves. Then, for four kinds of slaves of the small point number slave (IN slave) 21, the small point number slave (OUT slave) 22, the multiple point slave (IN slave) 23 and the multiple point slave (OUT slave) 24, a node address is assigned from #0, respectively. For identifying each slave, the kind thereof is factored in as well. COPYRIGHT: (C)2004,JPO
|
