초록 ▼

A programmable logic controller capable of freely and sequentially controlling peripheral equipment without modifying a system program. Necessary data for sequence control of the peripheral equipment are selected from data defined in the system program. The memory addresses corresponding to the data

A programmable logic controller capable of freely and sequentially controlling peripheral equipment without modifying a system program. Necessary data for sequence control of the peripheral equipment are selected from data defined in the system program. The memory addresses corresponding to the data are assigned to addresses to be used in a user program in an address storage unit. The controller executes the system program to sequentially control an industrial machine, and also executes the user program to control the peripheral equipment. The controller refers to the data being used in executing the system program, which are necessary for sequence control of the peripheral equipment, based on the designated relationship of the addresses stored in the address storage unit. Since necessary data for sequence control of the peripheral equipment can be obtained by combining the addresses arbitrarily by the user, it is not necessary to modify the system program in order to obtain the necessary data for sequence control of the peripheral equipment.

대표청구항 ▼

[ What is claimed is:] [1.] A programmable logic controller for sequence-controlling an industrial machine, comprising:a processor executing a non-editable system program and an editable user program;a memory storing a first data group to be used in executing the system program and a second data gro

[ What is claimed is:] [1.] A programmable logic controller for sequence-controlling an industrial machine, comprising:a processor executing a non-editable system program and an editable user program;a memory storing a first data group to be used in executing the system program and a second data group to be used in executing the user program in respective predetermined addresses, the respective data of the first data group being assigned to a specific addresses of said memory;an address storage unit storing a designated relationship between the respective addresses of said memory in which the second data group is to be stored, and the addresses of said memory which are assigned to respective data of the first data group, wherein said processor transfers necessary signals for executing said user program through said address storage unit; andan I/O module group for transferring signals to and from peripheral equipment, the system program including a program designating the addresses of said memory to which data indicating various operating statuses of the industrial machine are to be stored, and the addresses to which signals transferred between each input and output terminal of said I/O module group and the peripheral equipment are to be stored.