BACK UP DEVICE FOR PROGRAMMABLE CONTROLLER

PURPOSE:To switch buses optionally and to attain the easy maintenance of a back-up device for programmable controller by adding a manual switching function to a bus switching device which changes automatically a faulty utility system to a spare system to continue a control action. CONSTITUTION:When...

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Bibliographic Details
Main Author UCHIDA TOSHIO
Format Patent
LanguageEnglish
Published 02.10.1986
Subjects
CALCULATING
COMPUTING
CONTROL OR REGULATING SYSTEMS IN GENERAL
CONTROLLING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
FUNCTIONAL ELEMENTS OF SUCH SYSTEMS
MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS
PHYSICS
REGULATING
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Summary:PURPOSE:To switch buses optionally and to attain the easy maintenance of a back-up device for programmable controller by adding a manual switching function to a bus switching device which changes automatically a faulty utility system to a spare system to continue a control action. CONSTITUTION:When a utility system is working, i.e., a bus 102 is connected to a bus 100, a manual switch signal 301 is supplied to a manual switching circuit 54. Then a switch command signal 400 is delivered to a CPU of a utility system as long as the healthy signal 201 of a spare system CPU is active. The CPU of the utility system receives the signal 400 and copies the interim data on a data memory DM50 to a DM51. Then the CPU of the utility system delivers a bus switch signal 500 to the circuit 54 at a dividing point of the scanning execution and actuates a bus switching circuit 53 via a bus switching control circuit 52 to connect the bus 102 to a bus 101 at the side of the spare system.
Bibliography:Application Number: JP19850062056