PLC for distributed control and distributed control system
First Claim
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1. A PLC for distributed control in a distributed control system together with at least two other PLCs, wherein each of the PLCs is connected to all of the other PLCs to transmit data therebetween, the PLC comprising:
- a data transmission line connecting said PLC to all of the other PLCs in the distributed control system;
a storage unit that stores common-data specifying information for specifying common data shared by respective programs executed by the PLC and the another PLC, wherein the common-data specifying information includes information on an address where the common-data is assigned in a frame of a ladder diagram representing the content of programs to be executed by the PLCs;
a receiving unit that receives the common-data specifying information from the another PLC;
a collating unit that collates the information on an address stored in the storage unit with the information on an address received by the receiving unit; and
a normal data transmission determining unit that determines whether data is normally transmitted between the PLC for distributed control and the another PLC based on the collation of the common-data specifying information stored in the storage unit with the common-data specifying information received by the receiving unit.
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Abstract
A PLC for distributed control includes a storage unit that stores common-data specifying information for specifying common data shared by a corresponding PLC and another PLC, a receiving unit that receives the common-data specifying information from another PLC, and a collating unit that collates the common-data specifying information stored in the storage unit with the common-data specifying information received by the receiving unit.
6 Citations
22 Claims
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1. A PLC for distributed control in a distributed control system together with at least two other PLCs, wherein each of the PLCs is connected to all of the other PLCs to transmit data therebetween, the PLC comprising:
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a data transmission line connecting said PLC to all of the other PLCs in the distributed control system; a storage unit that stores common-data specifying information for specifying common data shared by respective programs executed by the PLC and the another PLC, wherein the common-data specifying information includes information on an address where the common-data is assigned in a frame of a ladder diagram representing the content of programs to be executed by the PLCs; a receiving unit that receives the common-data specifying information from the another PLC; a collating unit that collates the information on an address stored in the storage unit with the information on an address received by the receiving unit; and a normal data transmission determining unit that determines whether data is normally transmitted between the PLC for distributed control and the another PLC based on the collation of the common-data specifying information stored in the storage unit with the common-data specifying information received by the receiving unit. - View Dependent Claims (2, 3, 4, 5)
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6. A distributed control system comprising:
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at least three PLCs for distributed control, wherein each of the at least three PLCs is connected to all of the other PLCs of the distributed control system by signal lines and all of the PLCs are mutually cooperated with one another to transmit data therebetween by way of the signal lines, each of the PLCs comprising; a storage unit that stores common-data specifying information for specifying common data shared by respective programs executed by the respective PLC and another of the plurality of PLCs, wherein the common-data specifying information includes information on an address where the common-data is assigned in a frame of a ladder diagram representing the content of programs to be executed by the PLCs; a receiving unit that receives the common-data specifying information from another of the plurality of PLCs; a collating unit that collates the information on an address stored in the storage unit with the information on an address received by the receiving unit; and a normal data transmission determining unit that determines whether data is normally transmitted between the PLC and the another of the plurality of PLCs based on the collation of the common-data specifying information stored in the storage unit with the common-data specifying information received by the receiving unit. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A PLC for distributed control in a distributed control system together with at least two other PLCs, wherein each of the PLCs is connected to all of the other PLCs to transmit data therebetween, the PLC comprising:
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a data transmission line connecting said PLC to all of the other PLCs in the distributed control system; storage means for storing common-data specifying information for specifying common data shared by respective programs executed by the PLC and the another PLC, wherein the common-data specifying information includes information on an address where the common-data is assigned in a frame of a ladder diagram representing the content of programs to be executed by the PLCs; receiving means for receiving the common-data specifying information from another PLC; collating means for collating the information on an address stored in the storage means with the information on an address received by the receiving means; and normal data transmission determining means for determining whether data is normally transmitted between the PLC for distributed control and the another PLC based on the collation of the common-data specifying information stored in the storage means with the common-data specifying information received by the receiving means. - View Dependent Claims (13, 14, 15, 16)
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17. A distributed control system comprising:
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at least three PLCs for distributed control, wherein each of the at least three PLCs is connected to all of the other PLCs of the distributed control system by signal lines and all of the PLCs are all connected by signal lines and mutually cooperated with one another to transmit data therebetween by way of the signal lines, each of the PLCs comprising; storage means for storing common-data specifying information for specifying common data shared by respective programs executed by the respective PLC and another PLC, wherein the common-data specifying information includes information on an address where the common-data is assigned in a frame of a ladder diagram representing the content of programs to be executed by the PLCs; receiving means for receiving the common-data specifying information from another PLC; collating means for collating the information on an address stored in the storage means with the information on an address received by the receiving means; and normal data transmission determining means for determining whether data is normally transmitted between the PLC for distributed control and the another PLC based on the collation of the common-data specifying information stored in the storage means with the common-data specifying information received by the receiving means. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification