Modules all connected to one common bus.Status of each I/O module and channel (program running/failed/communications OK/failed).Temperature of –10 to 65☌ (operational conditions).Maximization of noise immunity (due to harsh environment).Rugged and of robust physical construction.Minimization of power consumption (CMOS can be an advantage).Robust operation – failure of one module will not affect the performance of other modules.Modular system – no particular order or position in installation (of modules in a rack).Maximum number of RTU sites in a system shall be expandable to 255.Individual RTU expandability (typically up to 200 analog and digital points) In the writing of a specification, the following issues should be considered: Control processor and associated memory.Government regulations for safety and metering of gas (for royalties & tax etc).Improved and quicker receipt of data so that clients can be invoiced more quickly and accurately.Improved energy savings due to optimization of the plant.Safeguarding the environment from a failure of the system.Improved safety of the system due to better information and improved control.Increased productivity of the personnel.Improved operation of the plant or process resulting in savings due to optimization of the system.A few typical reasons for implementing a SCADA system are: Obviously, a SCADA system’s initial cost has to be justified. Speed of communications/update time/system scan rates.Ratio and number of analog to digital points.Typical considerations when putting a SCADA system together are: SCADA has the connotation of remote or distant operation. There is a fair degree of confusion between the definition of SCADA systems and process control system. This all results in a lower cost of operation compared to earlier non-automated systems. A further benefit is more efficient, reliable and most importantly, safer operations. The accurate and timely data (normally real-time) allows for optimization of the operation of the plant and process. The master station displays the acquired data and also allows the operator to perform remote control tasks. Five Terms You MUST Be Familiar With: SCADA, DCS, PLC, RTU and Smart Instrument (on photo: PLC panel)Ī SCADA (or supervisory control and data acquisition) system means a system consisting of a number of remote terminal units (or RTUs) collecting field data connected back to a master station via a communications system.
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