PROGRAMMABLE CONTROLLER, COMMUNICATION UNIT, CONTROLLER SYSTEM, METHOD OF PROCESSING DATA, AND METHODS OF SOLVING VARIABLES AND OF HANDLING DATA

摘要

PROBLEM TO BE SOLVED: To provide a programmable controller capable of easily increasing cyclic communication capability (such as data quantity, the number of nodes). SOLUTION: Controllers 11a, 11b that operate and execute a program programmed by a variable name and communication units 12a, 12b that communicate with other nodes connected to a network are provided. The controllers store and retain a variable table that associates the variable name with a real address that specifies an area in which data corresponding to the variable name is stored, and the communication units store and retain communication setup information that specifies a variable name to be communicated with other nodes. When a system starts up, the communication units independently solve by making an inquiry to the controllers about a real address corresponding to the variable name stored in the communication setup information, and store and retain a temporary internal table that associates the variable name with the real address. COPYRIGHT: (C)2006,JPO&NCIPI