By Stuart G McCrady
Automation structures, also known as SCADA structures, contain programming at numerous degrees; those structures comprise machine variety box controllers that display screen and keep an eye on plant gear resembling conveyor platforms, pumps, and person workstations that permit the consumer to watch and keep an eye on the gear via colour photo monitors. all the elements of those platforms are built-in via a community, reminiscent of Ethernet for quick communications.
This ebook offers a pragmatic advisor to constructing the appliance software program for all points of the automation process, from the sphere controllers to the consumer interface workstations. the point of interest of the publication is not to merely offer functional tools for designing and constructing the software program, but additionally to boost a whole set of software program documentation. supplying proven examples and proceducres, this publication may be indespensible to all engineers coping with automation platforms.
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Additional resources for Designing SCADA application software: a practical approach
In this illustrative application, the basic operation and SCADA elements of a WTP will be provided, focusing on the SCADA software involved in each area of the plant. 5; a brief description of operations follows. The WTP generally consists of five process areas: Low Lift or Raw Water Station, Pretreatment, Filtration, High Lift or Treated Water Station, and Chemical injection systems. The Low Lift pumps the water from a source into the Pretreatment facility; there the raw water is treated chemically to remove bacteria and other foreign content.
What modes of operation will be available, such as Remote Manual and Remote Automatic? It would certainly help to have a standardized format for these detailed descriptions, and this is what is described later in Chapter 7. A single process area may have more than one logic description, and therefore there should be separate logic descriptions for each of the processes. These descriptions can then be organized into chapters or sections of the PCLDs document. 3 Documenting System Operations Some process operations are not specific to any one piece of equipment.
2 Programmable Process Controller A given application for a SCADA system is divided into process areas. Each such area has clearly defined operations to be performed. For example, a pumping station may use two or three pumps, operating in a lead/lag/standby mode; the automation program in the controller is configured to operate the pumps based upon operatorentered setpoints and duty assignments. Each process area identified within a SCADA system will require its own PPC. The PPC will be programmed so as to monitor all of the signals within the process area, and to effect control over the process equipment, based upon the design of the program.