What is input and output of plc & dcs
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Answer / greenborhan
All DCS has 2 types of inputs AI (Analogue Input), DI (Digital Input) and 2 types of outputs AO (Analogue Output), DO (Digital Output).
All the inputs and outputs may a contact signal or mA or mV
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Answer / faiyaz ahmad
DCS has three input network communication field control station engineer work station
PLC has many input proximity switch push button limit switch
PLC output is motor heater solenoid valve led
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Q1: Consider part of a control loop, which excludes the transmitter, consisting of a process, a controller and a control valve which may be represented by two dead times of 0.5 min each and three exponential lags of 0.8 min., 1.0 min. and 1.5 min. respectively. We wish to express this system as an overall first order plus dead time (FOPLD) model ie gain, time constant and process dead time. (We will see later that this is often done, to simplify controller tuning). For this exercise, gain is considered to be 1.0. (A) If the transmitter is a flow transmitter whose behaviour can be described by a dead time of 0.2 min. and an exponential lag of 0.5 min. in terms of the overall dead time and overall first order lag how can the system behaviour be approximated ? Overall dead time = Overall time constant = (B) If the transmitter is a temperature transmitter with a temperature sensor in a protecting well whose behaviour can be described by a dead time of 0.7 min. and an exponential lag of 15 min. how can the overall system behaviour be approximated now? Overall dead time = Overall time constant =
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