HEX string value > 2^31 issue.

[lfe]

there is no such thing as LREAL . This is a CompactLogix PLC running f/w 24.02. DINT is as high as I can go.

But the REAL type is supported, right?

Then use REAL instead of LREAL, there will be a loss of precision due a 32bit floating point has a 24 bit mantissa, but also multiplying by 10^-7 you will have to use REAL and you will always lose precision.

Another solution is to change the PLC Actually a cheap Micro820 supports all 64bit types.

 

[Latzi]

But the REAL type is supported, right?

Then use REAL instead of LREAL, there will be a loss of precision due a 32bit floating point has a 24 bit mantissa, but also multiplying by 10^-7 you will have to use REAL and you will always lose precision.

Another solution is to change the PLC Actually a cheap Micro820 supports all 64bit types.

It doesn't work with Real either. The Value is still bigger than the REAL type can handle. Yes you're right the Micro 820 can easily handle this but the Compactlogix I have it cannot and the it's too late to change the PLC all installed already and running the system.

Lucky I have a FTViewSE behind all this and I solved it using VBA behind the page which this has to be displayed on. Then moved the value calculated by the FTViewSE VBA code back to the PLC and job done.

Thanks for the ideas and for your time on this.I really appreciate it