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SCADA PLCs should be specified to be programmed using ladder diagrams. It is Used primarily by PLC programmers with a computer language background and is supported only in “high-end” PLC’s. Some PLCs have communications capability built-in to the processor, rather than using separate modules.
#Interface its plc professional with plc simulator serial#
Most commonly used modules are Modbus communication cards or Serial communication. These allow digital data transfer between PLCs and to other systems within the facility. (4) Communication :Ĭommunications modules are available for a wide range of industry-standard communication network connections. These are used to connect devices between plc and field devices like flow transmitters, pressure transmitters, control valves, analyzers, substation feeders for motor control etc. Examples of these modules are Analog Input Module, Analog output module, Digital input module, Digital output module etc. These modules provide the means of connecting the processor to the field devices. The processor module contains the microprocessor that performs control functions and computations, as well as the memory required to store the program. The power supply converts facility electrical distribution voltage, such as 230 VAC, 120 VAC or 125 VDC to signal level voltage used by the plc processor and other modules.