Network control system

摘要

First and second stations have first and second memory elements (2, 3) for storing first and second shared data, respectively, and a data transfer system (DT1) includes third and fourth memory elements (CM 12, CM 14) for storing third and fourth shared data, respectively, first and second transfer period determiner (CNT 90, CNT 92), a first transfer element (26a) working to operate in accordance with the first transfer period to have the second shared data stored in the fourth memory element (CM 14) and operate in accordance with the second transfer period to have the first shared data stored in the third memory element (CM 12), a second transfer element (26b) working for transfer of shared data between the fourth memory element (CM 14) and the third memory element (CM 12), and a third transfer element (26c) working to operate in accordance with the second transfer period to have the fourth shared data stored in the second memory element (3) and operate in accordance with the first transfer period to have the third shared data stored in the first memory element (2).

主权项

1. A network control system for data transfer of shared data between a first control device and a second control device, the network control system comprising:
a first station controlling data transfer to the first control device adapted to control equipment as a target thereunder; a second station controlling data transfer to the second control device adapted to control equipment as a target thereunder; and a data transfer system connected to the first station through a first network and connected to the second station through a second network, wherein the first station has a first memory storing a first shared data as one of the shared data, the second station has a second memory storing a second shared data as one of the shared data, and the data transfer system includes
a third memory storing a third shared data as one of the shared data,a fourth memory storing a fourth shared data as one of the shared data,a first transfer period determiner determining a first transfer period as a transfer period for transfer of the third shared data from the data transfer system to the first station,a second transfer period determiner determining a second transfer period as a transfer period for transfer of the fourth shared data from the data transfer system to the second station,a first transfer element operating at a first transfer timing to be a time point earlier than a second transfer timing determined in accordance with the first transfer period, to have the second shared data as stored in the second memory, stored as the fourth shared data in the fourth memory with an address identical to an address thereof in the second memory, and operating at a third transfer timing to be a time point earlier than a fourth transfer timing determined in accordance with the second transfer period, to have the first shared data as stored in the first memory, stored as the third shared data in the third memory with an address identical to an address thereof in the first memory in accordance with setting information,a second transfer element operating as the third shared data is stored by the first transfer element, to have this third shared data stored as the fourth shared data in the fourth memory with an address identical to an address thereof in the third memory, and operating as the fourth shared data is stored by the first transfer element, to have this fourth shared data stored as the third shared data in the third memory with an address identical to an address thereof in the fourth memory in accordance with the setting information, anda third transfer element operating at the fourth transfer timing, to have the fourth shared data as stored in the fourth memory, stored as the second shared data in the second memory with an address identical to an address thereof in the fourth memory, and operating at the second transfer timing, to have the third shared data as stored in the third memory, stored as the first shared data in the first memory with an address identical to an address thereof in the third memory in accordance with the setting information, wherein at least one of the first memory, the second memory, the third memory, and the fourth memory is a non-transitory tangible computer-readable storage medium.