CODESYS Forge - CODESYS Forge / Talk / Engineering 🇬🇧: How to manage variable types larger than 64 bits - Ethernet/IP

How to manage variable types larger than 64 bits - Ethernet/IP

Forum: Engineering 🇬🇧

Creator: opineiro

Created: 4 days ago

Updated: 4 days ago

opineiro - 4 days ago

Hi there,

I have a Keyence bar code reader connected to my plc through Ethernet/IP.
The Bar code is 20 digits long (like 30100790020493036016), the scanner reads it correctly (I can verify that through the keyence software) but when it sends it through ETH/IP, it doesn't fit into a 64 bit variable and it trunks the data.(I've tried ULINT and LWord without success).
When I loaded the EDS file, the read variable was defined as a byte with 128 bits length, which is quite strange for me. (see attached picture)
How do I manage this variable?
Thanks!

20240923-12_09_23.png

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ph0010421 - 4 days ago

My guess is that's a STRING, not an INT type.
And it's 128 bytes, not bits

Last edit: ph0010421 4 days ago

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opineiro - 4 days ago

Thanks, that's what I thought initially.
The point is that I can't select a String type variable. See the attached image

20240923-13_39_35.png

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ph0010421 - 4 days ago

So it's currently mapped to an array of BYTES? Can you create a UNION?

TYPE sBytesString : UNION AsBytes: ARRAY[0..127] OF BYTE; AsString: STRING(128); END_UNION END_TYPE

Map it to the bytes, read it in the STRING!
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opineiro - 4 days ago

Thanks, I'm going to try it!

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