Beckhoff serial communication

hapetter · Mar 9, 2009

Hi.

I have an application where Im going to read and write commands to/from a laser sensor. The sensor has RS232 serial interface. How can I read and write to the sensor using TwinCAT?

Ex. of a command I like to write:

Set Sample Interval

2-8 bytes ASCII Code: S <Interval>
(20 <= Interval <= 9999999)
Default: 200000 (5 Samples/second) Input switch code: 8<Sample Rate

Code>

How to implement in TwinCAT?

Best Regards
Hans Pettersson

Weo · Mar 9, 2009

hapetter said:
Hi.

I have an application where Im going to read and write commands to/from a laser sensor. The sensor has RS232 serial interface. How can I read and write to the sensor using TwinCAT?

Ex. of a command I like to write:

Set Sample Interval

2-8 bytes ASCII Code: S <Interval>

(20 <= Interval <= 9999999)
Default: 200000 (5 Samples/second) Input switch code: 8<Sample Rate
Code>

How to implement in TwinCAT?

Best Regards
Hans Pettersson

Hi,

There is a library called "Serial communication" which contains block for sending and receiving data over a serial interface.

Have a look in the help files, there are examples showing for both plc control and system manager.

Archie · Mar 9, 2009

Do you plan on using an RS232 port on a PC or a Beckhoff terminal like the EL6001?

hapetter · Mar 9, 2009

I would like to use EL6002.
I belive I need a license as well for the Lib.?

Archie · Mar 9, 2009

You will need to purchase a license for the serial libray.

I have not used the EL6002 and it looks like it is not actually available yet. I have used the EL6001 and it is fairly easy to implement your own code. I created my own function block that I use. In the attached code is the function block SerialCommFB that I used with the EL6001. Feel free to use it.

hapetter · Mar 9, 2009

EL6001 is fine to..
Awesome!
Thanks Archie

I will look into this asap.

shooter · Mar 9, 2009

go to www.oscat.lib
tax free

shooter · Mar 9, 2009

oops sorry www.oscat.de the lib is called oscat304.lib

hapetter · Mar 9, 2009

A free library. Cool.

How can I get lib from twincat? Do I copy the file into PLC lib folder?
The other files there is .lib and not .library?

Thanks!

Best Regards
Hans Pettersson

Weo · Mar 10, 2009

hapetter said:
A free library. Cool.

How can I get lib from twincat? Do I copy the file into PLC lib folder?
The other files there is .lib and not .library?

Thanks!

Best Regards
Hans Pettersson

Hi,

The file you are to download for TwinCAT has the extension *.lib, I think you downloaded the wrong file.

See picture for how to insert an additional library.
Off topic: I sent you a PM regarding another topic.

hapetter · Mar 10, 2009

Archie,

So you don't use TwinCAT serial library in the example you sent me?

I could not se the function block "SerialComFB" graphical symbol in Main program?

When I look into TwinCAT dokumentation then talks about beckground task for line control and so on. It seems to me you dont use this principle?

You have to excuse me for these newbe questions. I trying to learn the structured text language as well...

Best Regards
Hans Pettersson

Archie · Mar 10, 2009

hapetter said:
So you don't use TwinCAT serial library in the example you sent me?

Hans

That code does not use the Beckhoff serial library.

I wanted something a little simpler that I could import into other projects easily. I have only used it up to 9600 baud, so I'm not sure if it has limitations on baud rate since it runs in the main task.

I removed all the excess code and attached a sample that shows the function block being used in ladder. This should be a little easier to follow.

hapetter · Mar 10, 2009

Thanks

ravikiran242 · Apr 9, 2009

Hello Archie,
I have gone through the SerialCommExample code, you are not using ComLib.lib for serial communication.
I am trying to talk to PC_COM_PORT? Please can you help me in changes I need to do in the project you provided, because I dont have EL6001 hardware!

Archie · Apr 9, 2009

ravikiran242 said:
I am trying to talk to PC_COM_PORT? I dont have EL6001 hardware!

I'm working on testing it with KL6xx1 emulation using a PC serial port, but there seems to be a bug with the emulation. Once I figure out how to make it work, I'll post the programs.

Beckhoff serial communication

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