doc/standards.rst
author Andrey Skvortsov <andrej.skvortzov@gmail.com>
Fri, 25 May 2018 18:34:05 +0300
changeset 2168 a66062a205ae
parent 811 66a8812457d6
child 3925 1d383b4c0a23
permissions -rw-r--r--
Build by default with optimization level -O2 for GCC

before -O0 was used by default, that caused pretty bad performance.

Amd64, i6700k, 4200MHz, GNU/Linux (non-RT kernel), gcc 7.2.0

-------------------------------------
Optimization | EN/ENO |no EN/ENO |
-------------------------------------
default | 11 | 9.5 |
-O3 | 3.9 | 5.2 |
-O2 | 4 | 4.8 |
-Os | 4.1 | 3.5 |
-Ofast | 3.9 | 5.2 |
-------------------------------------

ARM, BBB Cortex-A8, 600Mhz, GNU/Linux, gcc 4.6.3

-------------------------------------
Optimization | EN/ENO |no EN/ENO |
-------------------------------------
default | 273 | 226 |
-O3 | 141.8 | 106.2 |
-O2 | 142 | 107 |
-Os | 152.5 | 112.2 |
-Ofast | 141.7 | 106.2 |
-------------------------------------

For embedded systems with size constaints (like Cortex-Mx, AVR and so
on) I usually use -Os. It gets pretty good results. For
GNU/Linux-based systems -O2 is usually a good choice, as you see the
test results.
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IEC 61131-3
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===========
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    IEC-61131 is a normative document provided by the standards organization IEC
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    (International Electrotechnical Commission) and describing a standard for
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    implementing programmable controllers.
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    The part 3 of this document (commonly named IEC 61131-3) specifies syntax and 
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    semantics for programming language for programmable controllers. Beremiz
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    implements all the languages described in this document. 
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    http://www.iec.eu
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PLCopen TC6
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===========
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    PLCopen is a vendor- and product-independent worldwide association defining
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    international standards for various topics related to control programming.
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    For this purpose, PLCopen has 6 technical committees.
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    The goal of the sixth committee (TC6) is to define a standard file format, 
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    based on XML, for exchanging programmables controllers programmed using 
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    IEC 61131-3 languages. Beremiz uses this file format for saving the PLC
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    programs of projects.
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    http://www.plcopen.org
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