make mistakes, some people do never make mistakes!
I work to live, my boss thinks I
live to work!
I´m not programming that long but i have
seen a lot of different way's to convert a flowchart to a program in a
plc. Sometime it is easy to read but takes a lot of the internal cpu
(e.g. some graphical tools like Graph from Siemens or Hitachi). A big
disadvantage of these programs is that you need these tools to be
installed on your pc with the source code. If you don’t have
the source code than your F*ucked.
I prefer to use the and/or logic that is in almost every plc on the
market (confirm the IEC 61131–3
standard. (Source: TwinCAT Quick Start 2.8)
). Even in some robots (i've seen it in the Motoman robots) there is a
little compiler that can be programmed with this language.
The most functions i've seen are special made for
that company, mostly not useable for anything else. I've made a
standard for myself with universal and easy functions that can be
common used. Thanks for all who have helped me with some functions.
I've divided the function in the folowing groups:
to convert an flowchart to a plc program. With function blocks.
- Fast step
to convert an flowchart to a plc program.
A very fast
methode! (aprox. 25 STL instructions per cyclus!)
- Functions to read inputs and write outputs or a combination
- Timer using SFC64
- Functions using the internal clock function SFC64 "TIME_TCK"
- Functions to handle DataBlocks (only for step7®
- Functions to calculate a mathematic function.
- Functions for making (easy) mathemetical calculations. (Most
likely as example for own functions).
- XY axis
- Functions for axis movements on PLC's
You can download
all functions as a library (step7 v5.3). Or as STL source in the