Studio-5000 HOW TO INCREASE THE LEN OF STRING?

[Shivsrikakolum]

I want increase the length of string from 82 to 150. By default it comes 82 is it possible to do so in Studio 5000

 

[Shivsrikakolum]

Got it Guys Thank You should have seacrhed for solution in this website rather than on youtube

 

[Ken Roach]

Exposition: the PLC-5 and SLC-500 operating systems had a fixed-length String datatype that was 82 characters long. So for compatibility, the ControlLogix default STRING datatype consists of a .LEN (4-byte DINT) value and a SINT[82] array of bytes.

You cannot change the fixed length of the default STRING datatype.

But you can create a custom-length STRING formatted datatype in Studio 5000 of any length you wish. It will have a .LEN element and a fixed number of characters for .DATA[x].

Packing arrays of strings in to UDTs like Shrivsrikakolum is doing can get complicated and use a lot of memory, but that's an extended discussion.

 

[ASF]

Just because if anyone here knows it'll probably be Ken, and because I've always wondered - why was 82 characters always the default? I understand that the newer processors kept it for compatibility with the older processors, but why were they 82 characters? It just seems like an oddly specific number.

 

[TheWaterboy]

I would guess that comes from from the older standard of 80 column display (and printer) with LF and CR at the end of the string.

 

[TheWaterboy]

But you can create a custom-length STRING formatted datatype in Studio 5000 of any length you wish. It will have a .LEN element and a fixed number of characters for .DATA[x].

How are the 82 character strings packed into memory? Would it be more efficient to create your own datatype if you only had 10 or 20 ( or 2 ) character strings?

 

[Shivsrikakolum]

Thanks ken for explaining

 

[Shivsrikakolum]

Hello @KEN I created a Datatype Strings with length 150 but when i used it , it says few errors. I am not sure why I work more on Omron PLCs so have not got much experience with studio5000 . i have attached screeshots can you please tell me what are they and what they mean? ​
Also this program was created by someone else.

I am using the created strings for different Tag but why is it affecting DataType ALARM_DIGITAL TAGS?

ERR : BASE TAG IS NOT VERIFIED

ERR : ASSOCIATED TAG MUST BE A BOOL, SINT, DINT,LINT OR STRING DATA TYPE

ERR : TAG DOESN'T REFRENCE VALID OBJECT OR TARGET

 

[JeremyM]

How are the 82 character strings packed into memory? Would it be more efficient to create your own datatype if you only had 10 or 20 ( or 2 ) character strings?

It will be 88 bytes. DINT length + 82 bytes + 2 bytes pad.