Answer / d das

A programmable logic controller (PLC) or programmable
controller is a digital computer used for automation of
electromechanical processes, such as control of machinery
on factory assembly lines, amusement rides, or light
fixtures. PLCs are used in many industries and machines.
Unlike general-purpose computers, the PLC is designed for
multiple inputs and output arrangements, extended
temperature ranges, immunity to electrical noise, and
resistance to vibration and impact. Programs to control
machine operation are typically stored in battery-backed-up
or non-volatile memory. A PLC is an example of a hard real
time system since output results must be produced in
response to input conditions within a limited time,
otherwise unintended operation will result.

why we are using digital signals for I/O & how to measure this signals is getting or not ?

0 Answers  

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what is the difference in Kg/cm2 and mmwc?

2 Answers   Niko,

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what is meant by turn down ratio?

3 Answers   Avant Garde,

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How can I make calculation for Install level transmitter (DP) for open tank and cloes tank?

1 Answers   Petrofac,

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wht is dcs architecture ? can u give example?

3 Answers  

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How Many Slave Can be used in one slave ?

2 Answers  

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what is transducer?

13 Answers   Sofcon,

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I work on a electronic positioner transmitter 4211 at the field.I connect my multimeter in series to get the current output then I calibrate it to 4ma in 0% of position of the valve and 20ma in 100% position of the valve.My problem is in the field I get the correct output current based on my multimeter but in the dcs they only receive 40% in a output 20ma of this positioner.Then I try to simulate in this analog card and they receive the equivalent percent on the value that I simulated.Is ther any possibility to reset the zero and span of this positioner 4211 fisher.And what other possibility I can do to fixed this.This is my email add ( landicho_randy@yahoo.com )

4 Answers  

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in current transmitter why we use 4-20ma ???

2 Answers   IMCO, IOCL,

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how to change 4 wire rtd transmitter into a 3 wire rtd transmitter? as our transmitter is working for 4 wire rtd, what should do for working on 3 wire rtd transmitter

1 Answers   HHJ,

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model question paper of instrumentation for Jindal GET 2010.plz reply sudhanshukumar08@yahoo.com

0 Answers   Jindal,

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what is vfd(variable frequency drive)?type of vfd.

2 Answers  

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