Siemen CP 340 Rs 232 Module

cotang · Aug 15, 2008

Hello,

I have an int value in my DB and I want to transmit that to hyperterminal. I can send something but it not showing up correctly.

Example, if I have an int value of 100 and when I transmit it, my hyperterminal would see the letter "d" which is correct, but I want the hyperterminal to see "100".

Can someone point me in the right direction. Thanks.

L D[AR2P#0.0] · Aug 15, 2008

You have to convert the integer value to a string and then send the characters from the string one at a time.

FC16 from the IEC conversion library will do the conversion.

cotang · Aug 15, 2008

L D[AR2 said:
You have to convert the integer value to a string and then send the characters from the string one at a time.

FC16 from the IEC conversion library will do the conversion.

Thanks for the reply, is there a way to monitor the Re_value of the function block? I want to see what the value is if I enter 100. Or would that be '1''0''0'?

L D[AR2P#0.0] · Aug 15, 2008

What parameter are you entering for FC16 ? - if its a DB then you can monitor the relevant area of the db using a VAT table - you should monitor each byte as a char. Note that with string variables, the first two bytes specify the max string length and the actual string length.
If you click on FC16 and press F1, the help will tell you the format of the string it produces. There is a sign that you may wish to skip.

cotang · Aug 15, 2008

I'm storing the Re_value into a DB block with a string[10]. I created the VAT table and set it all up but when I try to monitor it I can't select the format to modify as Char. You happen to have an example by chance?

L D[AR2P#0.0] · Aug 15, 2008

You need the absolute address of the start of the string.

Here's an example VAT table:

cotang · Aug 17, 2008

L D[AR2 said:
You need the absolute address of the start of the string.

Here's an example VAT table:

Thank you, I'll play around with it some more. I recently took the Siemens Course #1 and its been great but I need to play around with it a lot more to get a handle on things. So far I amaze myself as to being able to do so much but it the little stuff that get me stuck. I'll get back to you on my progress. Thank again.

cotang · Aug 18, 2008

I have another quick question. While working on this CP 340 Send function I'm trying to understand what the "Len" parameter does on the Function Block. It says its the data length. So I guess my question is what is it used for?

Siemen CP 340 Rs 232 Module

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