DIAGNOSTIC METHOD FOR FAILURE OF PRODUCTION LINE

• Main Authors: HOSHINO TOSHIHIKO, SAKAMOTO TOSHIHARU
• Format: Patent
• Language: English
• Published: 24.06.1992
• Subjects: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOTDIRECTED TO A PARTICULAR RESULT; CONTROL OR REGULATING SYSTEMS IN GENERAL; CONTROLLING; DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g.ARRANGEMENTS FOR COPYING OR CONTROLLING; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; MACHINE TOOLS; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OFPARTICULAR DETAILS OR COMPONENTS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS; PERFORMING OPERATIONS; PHYSICS; REGULATING; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TRANSPORTING

PURPOSE:To specify a failure part in a production line by comparing the possible motion time of a ladder program element with the actual motion time spent for changing of the ON/OFF states of a confirmation device for confirming the motion of the output device of the ladder program element. CONSTITUTION:In the case of there having been an actuator motion completion the proper block number (i) and step number informed from a ladder program side are read. And from this block number (i) the timer value TSsi, TSei and from a motion step map the execution prediction time tau of the proper motion step, are read, and an elapsed time TS,Y is operated. In the case of it being decided as TSxi-tau>delta0 (delta0 is constant), the motion block belongs to the motion step thereof is marked as failure, and the renewal of the prediction time tauis performed. Also, the motion step marked as under execution is searched, the elapsed time upto the present is calculated, and the proper block is marked as a step hungup failure, in case of Tp-TSsi>delta1 (delta1 is a constant).