What is the DIfferences between SMART transmitters and
PROFIBUS DP/PA Transmitters?
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Answer Posted / dibyendu das
PLC DCS
 Fast logic scan (approx. 10ms) is required to perform
motor or motion control.
 Control loops require deterministic scan execution.
perform motor or motion control at a speed of 100 to 500 ms
 Redundancy may not be cost justified.
 System redundancy is often required.
 System can be taken offline to make configuration.
 Online configuration changes often required changes.
 Analog Control: Simple PID only.
 Analog Control: Simple to advanced PID control up to
Advanced Process Control.
 Diagnostics to tell you when something is broken.
 Asset Management alerts you to what might break before
it does.
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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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