what are the different types of Protocols? & their applications.
Answer Posted / rajesh j
PROFIBUS - Siemens products
MODBUS - Modicon products
RIO - Remote I/O bus (general)
DH+ - Allen Bradley products (Generally)
FIELD BUS - Open bus communication in DCS
FF BUS - Foxboro Field Bus (foxboro products)
CAN Bus - ALSTOM products (Pls confirm)
RS232/ RS485 /RS422
HART - Rosemount products
BT - Brain Terminal for Yokogawa products
Others - Ethernet
TCP/IP
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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 =