SIMULTANEOUS MULTI-ADDRESS COMMUNICATION METHOD IN UNIDIRECTIONAL LOOP TYPE TRANSMISSION SYSTEM

摘要

PROBLEM TO BE SOLVED: To efficiently perform simultaneous multi-address communication for transferring the same data from an optional station to the desired controllers of all the other stations in a system provided with the plural stations provided with the plural controllers of a low order connected respectively through a bus on a unidirectional loop type transmission line. ;SOLUTION: A transmission data block 100 is composed of a head frame 101 for indicating the head of a data block and indicating the simultaneous multi-address communication, an address frame 102A and data frames 111-11n etc., like the figure (A). The address frame 102A is composed of a copy number 201 and a memory specifying address 202 like the figure (B). The copy number 201 is composed of bits capable of simultaneously specifying the plural controllers as destinations like the figure (C) and the memory specifying address 202 is composed of the relative address of a data storage area to the absolute address of the head part of the memory of a data destination controller and is in common regardless of the controllers. The respective destination controllers convert the relative address into the absolute address for themselves and store the data.;COPYRIGHT: (C)1997,JPO