Codesys convert word to bytes

Hello,

I am new to Codesys 3.5 and I am trying to figure out how to convert a word into 2 bytes to send to another plc via ethernet/ip. Could someone share copy of code that will make this work please?

Thank you
Intelduopower

http://www.plctalk.net/qanda/showthread.php?t=86007
http://www.plctalk.net/qanda/showthread.php?t=68817
http://www.plctalk.net/qanda/showthread.php?t=107167

The above threads may help you out.
Regards,

Intelduopower said:

Hello,

I am new to Codesys 3.5 and I am trying to figure out how to convert a word into 2 bytes to send to another plc via ethernet/ip. Could someone share copy of code that will make this work please?

Thank you
Intelduopower

Click to expand...

Hello and welcome to the forum. What is the other PLC brand?
It is important to understand this because EtherNet/IP has different mechanisms for communication. Codesys has EtherNet/IP scanner functionality with the basic license; so you can talk to a PLC which supports EtherNet/IP adapter functionality. It has an optional license for EtherNet/IP adapter with which it can communicate with an EtherNet/IP scanner. If the other PLC is a Logix processor, which supports CIP symbolic messaging, you can write a program that allows the Codesys program to read or write Logix tags directly. This is not trivial endeavour but fortunately there is a post in which some of us cracked this problem and may be useful for you.
It is a long post so you may want to go to page 5 directly.
http://www.plctalk.net/qanda/showthread.php?t=127087&page=5

Intelduopower said:

Hello,

I am new to Codesys 3.5 and I am trying to figure out how to convert a word into 2 bytes to send to another plc via ethernet/ip. Could someone share copy of code that will make this work please?

Thank you
Intelduopower

Click to expand...

Not sure I understand the issue here. The data is stored in bytes regardless. All you need to do is to provide a pointer to your source data and reference the data in byte format in your destination. With atomic data the only issue you will encounter is arrays of BOOL data which is stored as DWORDs (each DWORD = 32 bits) in ControlLogix PLCs. If you're reading data structures you'll have to take padding into account.

Hope this helps,

(8{)} .)
(Yosi)

I am sorry I forgot to add the second PLC. I am trying to get a Codesys 3.5 to pass an analog value over to a Automation Direct Productivity 2000 plc. I have attached a jpeg of the code that takes 2 bytes and converts them into a word. I had help from Eaton on this code but was trying to figure out on my own how to take a word and convert it to 2 bytes. The P2000 requires a array of bytes. All of the I/O is in Codesys so I am pass the data only one way. I have already got the two plc's communicating and can send bool's back and forth so I know that is working.

Does Codesys have unions? If the byte order is the same, it means the conversion is done for you via declarations.


Here is one approach: http://www.plctalk.net/qanda/showthread.php?p=464332#post464332


Here is another, using bits and a word but the concept is the same: https://forge.codesys.com/forge/talk/Engineering/thread/c408834957/