Answer / rasu3045

Ladder logic diagram
Statement list
functional block diagram

Answer / s vedpathak

Agree to Mr Rasu. Statement list (STL)is also called as
Instruction List(IL).But STL,LAD & FBD are 3 programming
languages

Answer / shiva

There are 3 main PLC languages,
1) Ladder Logic Diagram (LLD)
2) Sequential Function chart (SFC)
3) Functinal Block Diagram (FBD)

Answer / mohamed rafik

PLC BASIC LANGUAGES

*LADDER LOGIC DIAGRAM
*FUNCTIONAL BLOCK DIAGRAM
*STATEMENT LIST

Answer / faiyaz ahmad

Ladder Logic
Function block diagram
Instruction list
sequential flow chart

how ranges is decided for drum level or dearator level,in my pplant i have seen for boiler drum range is -1000 to 1000mmwc, while for dearator -2000 to 0 mmwc ,why they decided to take this range ?

2 Answers  

what is the significance of hook up

3 Answers  

1 bar is equal to how many pound per square inch(psi)?

14 Answers   Essar,

How can test or measure the probe and extension cable to identify if the problem at the probe or cable or at the driver it self? (pleast notify the measuring method)

0 Answers  

what's the reson that,Load is not same on VFD I/P and O/P Side.whenever DOL condition load is same I/P and O/P side.

2 Answers  

Describe the functions of the Operator Interface including the considerations related to alarming and display layout/configuration/layers.

0 Answers  

why 4 to 20 ma? why cant some other range?

3 Answers  

i hav applied for the post of engg. in iocl so please require the past test papers fro instrumentation engg please please help me and send me the papers or tell me the pattern and type of ques asked in examination......

0 Answers  

in split range control system we are using two control valves,but we have only one positioner and one feed back link.so how we use this one feed back link for two control valves?

2 Answers  

How can we say that accuracy of measurement increases by using 3 or 4 wire RTD? because for example: If resistance of RTD element is say r ohms and Resistance of the cable from transmitter to RTD is R ohms And if 4 wire RTD is used, ____._____________________ R ohms | |_____._____________________ R ohms / \ / r ohms \ \ | |______.__________________ R Ohms | |_______._________________ R ohms Then the actual resistance measured will be: Total = r + R/2 + R/2 = r +R Ohms Note: r+R instead of r ohms. hence error

2 Answers  

In RTU Panel we are having several Analogue & Digital Inputs /Outputs. We are recently facing some problems over Analog inputs , which are not updating properly (But Digital Input are updating normally) Can any one tell me from where the problem is creating , we have checked PLC CPU card, Analog Input card & we reconfigured ,But still the issue is there. Issue : 1. Sometimes Analog values are updating & sometimes not. 2. Analog values are not updating normally , showing some wrong Values 3. Total dead (0 value) Analog values are Level & flow measurement from the field instruments. (But in field the instruments are working normally & Displaying the values normally in local display unit) This problem we are facing in our Water Plant. If any one experienced this same problem or having any ideas related to our issue PLS send your valuable Answers/Replies...

6 Answers   L&T,

in sports(eg,cricket) what is the technique for measurement of speed of the ball thrown by the bowler.

6 Answers   BEL, PSU,