Client and server in supervisory control and data acquisition system

A server in a supervisory control and data acquisition system, the server comprising:

• a communication module, wherein a communication circuit communicates with at least one client and a real time database;
• and
• a data service module configured to:
• control, via a processor, the communication module to receive a request of data corresponding to a first screen specification from a first client;
• read, via the processor, a list of screen specifications registered in the server to determine whether a second screen specification identical to the first screen specification is registered on the server;
• when the second screen specification identical to the first screen specification is not registered on the server, register, via the processor, the second screen specification identical to the first screen specification and allocate a task for processing the data in accordance with the second screen specification;
• when the second screen specification identical to the first screen specification is registered on the server, control, via the processor, the communication module to publish the second screen specification to the first client;
• when the task has not proceeded, process, via the processor, the data for only a single time using the task;
• and
• control, via the processor, the communication module to send the processed data to the first client,
• wherein each of the first screen specification and the second screen specification is a requirement for data processing corresponding to the data and includes an update period of the data, and
• wherein the data service module is further configured to determine, via the processor, that the first screen specification is not identical to the second screen specification if the update period of the first screen specification is not identical to the update period of the second screen specification.

A method of operating a server in a supervisory control and data acquisition system, wherein the system includes at least one client and the server, the method comprising:

• receiving a request of data corresponding to a first screen specification from a first client;
• reading a list of screen specifications registered in the server to determine whether a second screen specification identical to the first screen specification is registered on the server;
• when the second screen specification identical to the first screen specification is not registered on the server, registering the second screen specification identical to the first screen specification and allocating a task for processing the data in accordance with the second screen specification;
• when the second screen specification identical to the first screen specification is registered on the server, publishing the second screen specification to the first client;
• when the task has not proceeded, processing the data for only a single time using the task;
• and
• sending the processed data to the first client,
• wherein each of the first screen specification and the second screen specification is a requirement for data processing corresponding to the data and includes an update period of the data, and
• wherein the method further comprises determining that the first screen specification is not identical to the second screen specification if the update period of the first screen specification is not identical to the update period of the second screen specification.