PLC with 64bit floating point and integer arithmetic?

[JesperMP]

I'm curious where anyone has found a statement that S7-1500 supports 64 bit floating point arithmetic.

In TIA, I can create LREAL and LINT tags easily.
And any math instuction can handle all kinds of data types, including LREAL and LINT.

Danw: from what I can find, they have a type LREAL and LINT, and a separate library of "long functions", eg LREAL_ABS. Most regular instructions don't accept them.

Where do you find this library with "LREAL_ABS" ? It sounds as it returns the absolute value of an LREAL. There is an "ABS" instruction that works with any data type. No need for a special library.

 

[mk42]

Where do you find this library with "LREAL_ABS" ?

When I open Portal it is the 4th built in global library I see:

• Buttons and Switches
• Drive Lib 1200 1500
• Drive Lib 300 400
• Long Functions

I agree, the standard math instructions all seem to take Longs, at least in V14. My assumption is that there was a time where the extra library was needed (V11 for the 1200? V12?), and they eventually expanded the standard functions without deleting the library.

 

[JesperMP]

LREALs and LINTs work with the standard instruction set in V13 SP1 as well (which I still use).

 

[daba]

Didn't they put man on the moon within a few hundred yards of target with 8-bit microprocessors ?

Surely there's another way to make these "precision" errors less demonstrative....

There's a couple of people on here who I am sure have the skills to suggest something, but I don't like to name names...

 

[kamenges]

Be careful with your anecdotes. Here in the US "they" used to travel from Missouri to California by horse and wagon. And every once in a while "they" had to eat each other along the way.

Just because something was done a certain way in the past, often successfully, doesn't mean there isn't a better way to do it today. If you aren't tied to a platform and long datatypes are that important to you, use a platform that supports long datatype arithmetic. There are enough of them available.

Keith

 

[daba]

Be careful with your anecdotes. Here in the US "they" used to travel from Missouri to California by horse and wagon. And every once in a while "they" had to eat each other along the way.

Keith

But.. "Mission accomplished"

If you aren't tied to a platform and long datatypes are that important to you, use a platform that supports long datatype arithmetic. There are enough of them available.

Keith

Assuming that "long datatypes" will be good enough.... I was just saying that there are more ways of killing a cat....