https://forge.codesys.com/forge/talk/CODESYS-V2/thread/32328be6ed/2020-02-27T21:08:57.091000ZRecent posts to Double (IEEE754 Double precision 64-bit)2020-02-27T21:08:57.091000Z2020-02-27T21:08:57.091000Zjacob6580https://forge.codesys.com/u/jacob6580/https://forge.codesys.comc2db713c8ac2d45fb1a24343e44eaebc1540f9a2

<div class="markdown_content"><p>Imagine the scenario I have a display that only accepts double precision numbers (IEEE754), via serial comm, to display.<br/> If I send REAL or even REAL2 from oscat, I won't have the same byte configuration and I'll display a completely wrong number.<br/> Because REAL is float<br/> 1 bit sign<br/> 8 bits exponent<br/> 23 bits mantissa</p> <hr/> <p><a class="" href="http://www.marjinalescort.com/" rel="nofollow">Escort Bayan</a></p></div>

2020-02-27T21:08:52.155000Z2020-02-27T21:08:52.155000ZArFehttps://forge.codesys.com/u/arfe/https://forge.codesys.comfb5e05299c6796a7cbc082fb50ac30f2482ce592

<div class="markdown_content"><p>Yes, the difference is because it's single precision, so it's not that good.<br/> Cool the project you're working on.</p> <p>Cheers,<br/> Ariel</p></div>

2020-02-27T21:08:50.597000Z2020-02-27T21:08:50.597000Zshooterhttps://forge.codesys.com/u/shooter/https://forge.codesys.comcd5beb4462e4c2c9c02aac10869ad98feb89c3d1

<div class="markdown_content"><p>sorry i meant the decimal and binary one.<br/> I am working on function block real calculation with very high precision and any number system, so from 2 (being 0..1) to 16 (0..F) including 10 (0..9).<br/> to have calcs like plus/minus/div/mul.</p></div>

2020-02-27T21:08:46.364000Z2020-02-27T21:08:46.364000ZArFehttps://forge.codesys.com/u/arfe/https://forge.codesys.com5dbb86a128612c4a7cddc78820a8ed9908b5e887

<div class="markdown_content"><p>Hi shooter, thanks for your reply and for testing the functions.<br/> What do you mean by &gt;<strong>Zitat:</strong><br/> differences between the digital one and the binary</p> <p>I didn't get it.</p></div>

2020-02-27T21:08:44.934000Z2020-02-27T21:08:44.934000Zshooterhttps://forge.codesys.com/u/shooter/https://forge.codesys.com435ddd71eaeb0c05e6f3b0dca2288432e4e82d99

<div class="markdown_content"><p>It looks working good.<br/> If you need to do calcs on your doublereal just give a shout.<br/> btw i saw some differences between the digital one and the binary so be aware of your numbers.</p></div>

2020-02-27T21:08:40.907000Z2020-02-27T21:08:40.907000ZArFehttps://forge.codesys.com/u/arfe/https://forge.codesys.come2d62fd303bced91e961555244799bba159eb44d

<div class="markdown_content"><p>Follow the file where it's done.<br/> Got some info from here:<br/> <a class="" href="http://kipirvine.com/asm/workbook/floating_tut.htm" rel="nofollow">http://kipirvine.com/asm/workbook/floating_tut.htm</a></p> <p>Ariel</p> <p><a class="" href="https://forum.codesys.com//download/file.php?id=281" rel="nofollow">REAL_BYTE.pro <span><span>[22.31 KiB]</span></span></a></p></div>

2020-02-27T21:08:39.472000Z2020-02-27T21:08:39.472000Zshooterhttps://forge.codesys.com/u/shooter/https://forge.codesys.com006b9ab2156652ca003b8ce44ad527d381c33a06

<div class="markdown_content"><p>If needed more help, then contact me or put it in oscat forum.<br/> I can make conversion, however it will need some calcs.<br/> how did you make it now?</p></div>

2020-02-27T21:08:38.003000Z2020-02-27T21:08:38.003000ZArFehttps://forge.codesys.com/u/arfe/https://forge.codesys.com8d7a2ac9630bca6eff26808498e8a7937c07557b

<div class="markdown_content"><p>Thanks for you reply shooter, but that was not exactly what I need.<br/> Imagine the scenario I have a display that only accepts double precision numbers (IEEE754), via serial comm, to display.<br/> If I send REAL or even REAL2 from oscat, I won't have the same byte configuration and I'll display a completely wrong number.<br/> Because REAL is float<br/> 1 bit sign<br/> 8 bits exponent<br/> 23 bits mantissa<br/> REAL2 is something based on REAL, so same config, and what I need is<br/> 1 bit sign<br/> 11 bits exponent<br/> 52 bits mantissa</p> <p>I've done a brute force conversion, not really sure it will work always.</p> <p>Ariel</p></div>

2020-02-27T21:08:34.007000Z2020-02-27T21:08:34.007000Zshooterhttps://forge.codesys.com/u/shooter/https://forge.codesys.comc3ea837a217874c339248430f03206b72d7d8764

<div class="markdown_content"><p>few ways to solve this.<br/> make your output a string and add some characters needed.<br/> look w <a class="" href="http://www.oscat.de" rel="nofollow">www.oscat.de</a> w and find REAL2<br/> make yourself a datatype in codesys</p></div>

2020-02-27T21:08:32.561000Z2020-02-27T21:08:32.561000ZArFehttps://forge.codesys.com/u/arfe/https://forge.codesys.com657d0d678a21d914fca57bc1fcef81644ac0c329

<div class="markdown_content"><p>Hello all,</p> <p>I need to use Double instead of Float in Codesys 2.3.<br/> As I tested, CoDeSys uses float standard for REAL and LREAL. The difference is that the mantissa in LREAL is bigger, but not the exponent, as it should be in Double.<br/> Bellow you find examples of what it should be.<br/> <a class="" href="http://www.binaryconvert.com/result_double.html?decimal=050048048048" rel="nofollow">http://www.binaryconvert.com/result_dou ... 0048048048</a><br/> <a class="" href="http://www.binaryconvert.com/result_float.html?decimal=050048048048" rel="nofollow">http://www.binaryconvert.com/result_flo ... 0048048048</a></p> <p>The problem is I need to send the data over a serial connection, and thus, the reception device accepts only Double.<br/> Is there a library where I can convert LREAL in Double?<br/> Or does anybody know a function to do so?</p> <p>Is it a CoDeSys bug, or it should work like this?</p> <p>Thanks in advance,<br/> Ariel</p></div>