| 摘要 |
PURPOSE:To reduce remarkably a scanning signal transmission time from a master station to each slave station by using the 1st scanning signal so as to allow a slave station side to store various supervised items thereby commanding each supervisory item in 1-bit after the 2nd and succeeding signals. CONSTITUTION:A master station 1 references a control table 2 and transmits all supervised items C1 ''0001-0011'', C2 ''0001-0100''... CN ''1000-1000'' according to a format shown in figure as the 1st polling signal to all slave stations in order. A control section of the slave station 1 decodes the 1st polling information, transmits the supervised items C1-CN to a storage section 7, and they are stored to a prescribed position. The master station transits supervised request item bits D1 ''1'', D2 ''0''... DN''1'' to the slave station 1 according to the format in figure. The 2nd polling information commands the execution of the supervised items C1-CN stored in the storage section 7 depending on ''1'', ''0'' of each bit of the supervisory request item bits D1-DN. The master station commands execution/non-execution of the supervised item in 1-bit to execute the supervised item. |
