double precision arithmetic

Are there standard libraries that manage double precision arithmetic (64 bits float) in SCL or similar for the S7400 PLC (that manages float of 32 bits)??

Any ideas??

I`m not sure, but think F8 files in rslogixs do the same thing as double word in say directsoft PLC direct.

ts: I don´t understand what you say, can you be more specific?
I´m speaking of Siemens S7-400

Thanks

F8 files in SLC/500 PLC's are 32 bit Floating Point numbers. This is the equivalent of Single Precision floating point numbers.

ndzied1
I understand what you say, but apparently you don´t understand my question.
I need to do some basic double precision arithmetic in a PLC that just manages single precision. That´s why I was asking if anyone knows a method to do that

Thanks anyway

Sorry, I was responding to ts and his comments.

I think you're going to have to do some experimentation with the data you have and the information given to you in this thread.

What does the hex value of your data look like? Can you post some examples of hex data and expected decimal values. There are people here who love to play with stuff like this but you need to throw the dogs some bones to chew on so to speak.

nOrM

norm: thanks for you answer.
Let´s say I need to substract lat and long, the values of them are:
arTramaGpsIn[36]:=16#a1; //lat1
arTramaGpsIn[37]:=16#1f; //lat2
arTramaGpsIn[38]:=16#2; //lat3
arTramaGpsIn[39]:=16#9c; //lat4
arTramaGpsIn[40]:=16#e5; //lat5
arTramaGpsIn[41]:=16#8e; //lat6
arTramaGpsIn[42]:=16#49; //lat7
arTramaGpsIn[43]:=16#40; //lat8
arTramaGpsIn[44]:=16#d7; //lon1
arTramaGpsIn[45]:=16#40; //lon2
arTramaGpsIn[46]:=16#b7; //lon3
arTramaGpsIn[47]:=16#c4; //lon4
arTramaGpsIn[48]:=16#72; //lon5
arTramaGpsIn[49]:=16#82; //lon6
arTramaGpsIn[50]:=16#5c; //lon7
arTramaGpsIn[51]:=16#c0; //lon8
beeing lat1 and lon1 the LSB of two 64bits floating point numbers, I mean lat= H40498EE59C021FA1 and long =HC05C8272C4B740D7 (remember sign, exponent, etc)
Now, how do I substract those two numbers if my PLC doesn´t deal with double precision?
Thanks again