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10-Marble
April 11, 2025
Solved

Adressing longer string in Allen Bradley PLC.

  • April 11, 2025
  • 1 reply
  • 577 views

Hello, 

 

I've created new string data type in Rockwell PLC, that contains 250 and 1000 signs. However I'm unable to read 1000 it in KEP. 

TT_13245152_3-1744372388852.png

TT_13245152_0-1744372718042.pngTT_13245152_1-1744372726767.png

This article says, that 255 can be displayed, 

"When the String length is more than 255 the left characters will not be displayed"

However i get unknown value. What can be the issue?

 

Best answer by aservetas

The OPC Quick Client installed with the server is limited to displaying 255 characters as it is not expected to be used for anything other than testing.

 

Third-party or custom client applications reading the DATA component of those string tags should be able to display greater than 255 if that is what the client is designed to allow.

 

Best regards,

Andy Servetas
Principal Technical Support Engineer | Kepware Technologies

1 reply

aservetas15-MoonstoneAnswer
15-Moonstone
April 11, 2025

The OPC Quick Client installed with the server is limited to displaying 255 characters as it is not expected to be used for anything other than testing.

 

Third-party or custom client applications reading the DATA component of those string tags should be able to display greater than 255 if that is what the client is designed to allow.

 

Best regards,

Andy Servetas
Principal Technical Support Engineer | Kepware Technologies