Iec 61131

aec

Member
A
Join Date
Sep 2011
Location
dubai
Posts
162
first of all I dont clearly understand what this IEC 61131 is for ?

cant we use ladder logic ?????

I read several articles but I dont understand this IEC standard

Some where I read it supports all the types like
stl code, instruction list , ladder logic ,funtional .

or does it supports only one specific code ????
if yes which one is it ?????

please can any one explain it in simple terms .
 
IT is the european Standard software requirement for PLC's
comonly called or refered to as Codesys.
Able to be programmed by 5 methods
 
thank you for your quick response sir . so that means we can program in ladder logic , instruction list , structured language and the res i dont know .
but as for as now , I know ladder logic thats y i was worried .

also i would request you to help me in selecting a PLC with iec 61131 approved .if required i would attach the requirements
 
also i would like to know which code is mostly supported by all the products or which code is mostly supported by IEC 61131 .

is it ladder or instruction list or structured code ??????
 
Hi sir thanks for the link , I have downloaded the software and in installation process . Mean I got this link
after some search I got this link http://www.plcopen.org/pages/tc3_certification/certified_products/

I just want to know wether I'm in right path about IEC 61131 .

From the above link I could see that all the software are supported eitherin ST or IL code so ladder has not yet been certified .
Am I correct ???? So should I have to learn ST coding if yes could you please suggest me a link or book ??????
 
CoDeSys is not IEC 61131.

It might be closest implementation of it but it is not same thing.

Siemens states IEC 61131 conformability like many others. Its pretty relaxed standard.
 
aec said:
first of all I dont clearly understand what this IEC 61131 is for ?
Click to expand...

IEC 61131-3 is the third part (of 8) of the open international standard IEC 61131 for programmable logic controllers, and was first published in December 1993 by the IEC.
The current (second) edition was published in 2003.
Part 3 of IEC 61131 deals with programming languages and defines two graphical and two textual PLC programming language standards:
Ladder diagram (LD), graphical
Function block diagram (FBD), graphical
Structured text (ST), textual
Instruction list (IL), textual
Sequential function chart (SFC), has elements to organize programs for sequential and parallel control processing.

Look here for more information - http://en.wikipedia.org/wiki/IEC_61131-3

also -
http://www.oacg.co.uk/iec61131.html
http://www.motioncontrolonline.org/i4a/pages/index.cfm?pageID=4099
 
Last edited:
moggie said:
IEC 61131-3 is the third part (of 8) of the open international standard IEC 61131 for programmable logic controllers, and was first published in December 1993 by the IEC.
The current (second) edition was published in 2003.
Part 3 of IEC 61131 deals with programming languages and defines two graphical and two textual PLC programming language standards:
Ladder diagram (LD), graphical
Function block diagram (FBD), graphical
Structured text (ST), textual
Instruction list (IL), textual
Sequential function chart (SFC), has elements to organize programs for sequential and parallel control processing.

Look here for more information - http://en.wikipedia.org/wiki/IEC_61131-3

also -
http://www.oacg.co.uk/iec61131.html
http://www.motioncontrolonline.org/i4a/pages/index.cfm?pageID=4099
Click to expand...

thanks moggie got a brief idea and much releived
:oops:

iant said:
A lot of the links on that site are definately not 61131 compatable
Click to expand...

any other website which lists the certified product and company ?????? I mean Genuine
sorry I know I sound dumb but need to know how to know which company has a certified product ?????

TurpoUrpo said:
CoDeSys is not IEC 61131.

It might be closest implementation of it but it is not same thing.

Siemens states IEC 61131 conformability like many others. Its pretty relaxed standard.
Click to expand...

codesys is base level certified and for siemens it is CL & RL for S7-SCL .
 
There is a difference between a Standard and Specification

iant said:
IT is the european Standard software requirement for PLC's
It is a specification. Most PLCs are S7 or Rockwell. S7 STL does not follow the IEC specification but it is a standard way of programming due to the numbers in use.

comonly called or refered to as Codesys.
Click to expand...
Codesys is just one implementation of the specification.

We use the IEC 61131-3 as a guide for implementing our control language. When we mention IEC 61131-3 most customers have no clue what it is but they have heard of Rockwell and S7 programming to a lesser extent.

We are not that far along at getting the IEC specification implemented but we have put more emphasis on debugging which really isn't covered by the specification. When you are in the trenches you want debugging tools not an awkward implementation of a specification.

Beware of marketing people.

Marketing people often use the IEC specification to promote their IEC products when competing with more established non IEC products even those these products are truly more standard. I would say the RS5000 is a standard and Codesys is not.
Click to expand...
Click to expand...
 

Similar Topics

C
Analog input to digital output using structured text or one of IEC 61131-3 standard
Hello, I have a small programming task that I need help solving. I have to: * Create an analog input (4-20v)and a digital output * The analog...
2 3 4
Replies
45
Views
25,270
parky
P
O
IEC 61131-3 compliance and Rx3i
I was poking through the Stackoverflow PLC Tag when I saw this answer to a question about converting a Real to a DWord and back again. What...
Replies
8
Views
2,942
mk42
M
H
IEC 61131-3 Function Blocks
I am looking for some expert advice. I have always made function blocks both with inputs and outputs and without inputs or outputs. I make the...
2
Replies
21
Views
6,844
Geospark
Geospark
T
Iec 61131-3 ?? What is it?
Hello and happy new year! I would like to further understand who needs to design by this standard and is it a requirement for everyone or only...
Replies
3
Views
1,805
KalleOlsen
K
T
Advantages of different IEC 61131-3 Languages
So Ladder is easy to read graphically, most everything can be coded in ladder, and it represents wiring diagrams the closest. SCL and ST are good...
Replies
5
Views
1,778
cardosocea
C
Back
Top Bottom