How to perform PLC remote I / O system and the PLC remote I / O system

摘要

PROBLEM TO BE SOLVED: To prevent the superposition of IN data received from respective IN slaves and to surely receive the IN data. ;SOLUTION: At the time of receiving OUT data frame OF from a remote master by batch transmitting/receiving method, respective IN slaves transmit IN data frames IF0 to IF2 to the remote master at each timing of reference idle time in which frames are not mutually superposed by considering frame length and physical delay. The remote master receives the IN data frames IF0 to IF2 with the time slot of each slave based upon the basic idle time and enters respective IN data IN0 to IN2 based upon start bits to be the headers of respective data frames IF0 to IF2.;COPYRIGHT: (C)1997,JPO