Programmable controller with fuzzy control function, fuzzy control process and fuzzy control monitoring process

• US 5,388,190 A
• Filed: 08/02/1993
• Issued: 02/07/1995
• Est. Priority Date: 10/24/1989
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Nakano, Nobumasa
• Primary Examiner(s): MacDonald, Allen R.
• Assistant Examiner(s): Downs, Robert W.
• Application Number:
  US08/100,366
• Time in Patent Office: 554 Days
• Field of Search: 395/11, 395/900, 395/61, 364/131-139
• US Class Current: 706/52
• CPC Class Codes: G05B 13/0275 using fuzzy logic only
• CPC Class Codes: G05B 19/052 Linking several PLC's
• CPC Class Codes: G06F 1/035 Reduction of table size G06F1/0314 takes precedence
• CPC Class Codes: G06N 7/04 Physical realisation
• CPC Class Codes: Y10S 706/90 Fuzzy logic

Abstract

A process for monitoring fuzzy control information of a programmable controller having a fuzzy control function and at least one input converting module and/or output converting module by using a fuzzy control monitoring device. This process includes the steps of defining fuzzy membership functions, fuzzy output functions and/or fuzzy result functions using a format comprising a plurality of points, and storing data representing these functions in at least one of the input converting modules and/or output converting modules. Data is generated which includes first fuzzy grade numbers, second fuzzy grade numbers and/or a composite fuzzy set based on the functions. The process further includes the step of monitoring production of the generated data by using the monitoring device. Another control monitoring process of the invention includes the steps of connecting a plurality of programmable controllers comprising at least an input converting module and/or an output converting module, by a network, and storing at least one fuzzy control function in at least one of the input converting modules and/or output converting modules. The process further includes the step of monitoring the fuzzy control information of the plurality of programmable controllers using a single fuzzy control monitoring device coupled to the network.

Claims

1. A fuzzy monitoring process for monitoring fuzzy control information of a programmable controller having a fuzzy control function and at least one of an input converting module and an output converting module, by using a fuzzy control monitoring device, comprising the steps of:

defining at least one of fuzzy membership functions, fuzzy output functions and fuzzy result functions using a definition format comprising a plurality of points and storing data representing said at least one function in at least one of said input converting module and said output converting module;

generating data including at least one of first fuzzy grade numbers, second fuzzy grade numbers and a composite fuzzy set based on said at least one function; and

monitoring the production of said generated data using said monitoring device.

2. A fuzzy control monitoring process for monitoring fuzzy control information of a plurality of programmable controllers connected by a network and each having a fuzzy control function and at least one of an input converting module and an output converting module, by using a single fuzzy control monitoring device, comprising the steps of:

defining at least one of fuzzy membership functions, fuzzy output functions and fuzzy result functions using a definition format comprising a plurality of points and storing data representing said at least one function in at least one of said input converting module and said output converting module of each of said plurality of programmable controllers;

generating, for each of said programmable controllers, data including at least one of first fuzzy grade numbers, second fuzzy grade numbers and a composite fuzzy set based on a respective said at least one function; and

monitoring the production of said generated data of said plurality of programmable controllers using said single fuzzy control monitoring device.