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US 12,105,551 B2Granted
Control system
AssigneeOMRON Corporation
InventorsShigeyuki Eguchi, Yoshihide Nishiyama
Life of this patent
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Abstract
A control system for factory automation includes a first unit and a second unit that exchange data with each other, and a synchronization module that synchronizes a control counter included in the first unit and a control counter included in the second unit using a clock. Each of the units includes an information storage that stores information on conversion for calculating a time from a counter value of the counter of the unit, the information being shared between the units.
Claims14
A control system for factory automation, the control system comprising:
- a first device comprising a first control counter, a first storage storing one or more programs, and a first processor that accesses the first storage and executes at least one of the one or more programs to cause the first processor to control components of the first device and that accesses the first storage and executes at least one of the one or more programs to cause the first processor to control and perform various processing on a control target;
- a second device comprising a second counter, a second storage storing one or more programs, and a second processor that accesses the second storage and executes at least one of the one or more programs to cause the second processor to perform processing related to the second device, the second device being configured to exchange data with the first device;
- and
- a synchronization processing circuitry configured to synchronize the first control counter and the second control counter using a clock,
- wherein
- the first device includes a first information storage configured to store conversion information on a conversion for calculating a time from a time managed by the clock and a counter value of the first control counter,
- the second device includes a second information storage configured to store conversion information for calculating a time from the time managed by the clock and a counter value of the second control counter, the conversion information being shared respectively between the first device and the second device,
- wherein the synchronization processing circuitry determines whether an accuracy of a time managed by an external clock provided outside the control system satisfies a predetermined condition, switches the clock to the external clock when the accuracy of the time managed by the external clock satisfies the predetermined condition, and switches the clock to an internal clock included in one of the first device and the second device when the accuracy of time managed by the external clock does not satisfy the predetermined condition.
5 more elements
Dependencies are inferred from the claim text.