Hardware,Input,Output,Interfac technology Hardware Input/Output Interface
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The following description of processflow of a wired input coming from a plant system describes the working of thisinterface:· The signal is agitated between the inputboard of the PLC and the plant system.· In a first function of software calledthe Inputs Wrapper, the signal is duplicated from an area of I/O addressingto an area of DB addressing, e.g. Input I0.0 is duplicated to DB1.DBX0.0.Note: PLC complete addressing is employed here for better understanding, but signsshould be used. Now, the signal becomes a joint DB variable.· If the signal is Boolean, the variablegoes through via a layer of Anti-Rebounce.· The joint DB variable is transferred toa block of Interface Switch where the judgment is made to utilize the signalcoming from a simulator or a wired signal. Another joint DB variable is issued.· The joint DB variable issued is transferredto an FBS Wrapper, where the variable is duplicated from a component namingconvention to an FBS Level 3 convention or FBS-L3.variable. Another joint DBvariable is issued.· From the FBS Wrapper, the joint DBvariable can be practiced, base on if it is a numerical, originally from ananalog signal, or a variable of Boolean, originally from a digital signal.- Variable of Numerical: is changed to a valueof engineering base on a look up table, or a linear regression, etc Conversionof Signal to Engineering. Another joint DB variable is issued.- Variable of Boolean: here the value of Booleancan be reversed or not, base on the logic the developer desires to use in thecore application. For instance, so as to have fail-safe logic, the device statuscould be notified by a signal of 0V, which is more suitable for encoding aTRUE. Another joint DB variable is issued.Thevariable goes through a layer of Forcing, where its value can be strengthenby the user for maintenance or commissioning purposes. The variable is issuedby the input interface of hardware.-The variable is transferred systematically to the States Variables CODACInterface transmission mechanism and can be employed by the core application ofPLC.
Hardware,Input,Output,Interfac