LINT, ULINT, LWORD - 64-bit variables?

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1

Is there some way to operate with 64-bit variables? LINT, ULINT, LWORD

I need to read energy consuption from energymeter over MB (thats no problem) and operate in program (compare) and show them in mappView.

obrazek
obrazek702Ă—146 25.2 KB

2

Convert to LREAL or to string in a c-task.

3

I do the C-Library with “long long int” variable, which return LREAL, DINT,… → I need to calculate difference from INT64 and result in DINT is OK.

4

The easiest solution is probably as you do, to use a C library or a C task. If I needed 64-bit integers in ST, I wouldn’t use string conversions. Instead, I’d create a small function library on top of a struct containing two UDINTs.

UInt64Add()
UInt64Sub()
UInt64Compare()
UInt64ToLReal()
etc.
Using:
STRUCT
High : UDINT;
Low : UDINT;
END_STRUCT;