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Hi guys, I'm new to this tool Codesys and is trying to create a plc system as the client and a pc as the server/controller of the PLC.
We have inherited an old 800M PLC system and I like to update and convert it into cheaper systems like AC500.
Today, the system sends a ascii message to the plc and there it is parsed out using case .. of.
Now to my problem, I have multiple physical I/O's to controls ie valv/rods to handle and from the case I call to the valv/rod nr to execute.
I've created a function block using CFC. and a input-variable to call. Global variables for global usage
The message (Telegram) is read, if any exists every 500ms,
The total executiontime for functionValv() is 70 sec.
After 60 sec I want to place another call to prepare execution of other programs/functions
first call |----------------------------------------------------||-----other exec----|
sec call |---------------------------------------------------||---
In my CASE steg OF
1:
functionValve( en:=Enabled, parameterArray:= parameters);
I've managed to resolve my problem, as to understanding that:
I can have one implementation of my function block and
I've also understood that I have to make input assignment to make a controlled usage, ie I'm creating my own datatype, make variables and configure them on startup and modify during runtime and use as input on function calls.
What I don't understand sofar is how the memory usage is for my instances above. Will I run out of memory a.s.o.
Time will tell
/a
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Hi guys, I'm new to this tool Codesys and is trying to create a plc system as the client and a pc as the server/controller of the PLC.
We have inherited an old 800M PLC system and I like to update and convert it into cheaper systems like AC500.
Today, the system sends a ascii message to the plc and there it is parsed out using case .. of.
Now to my problem, I have multiple physical I/O's to controls ie valv/rods to handle and from the case I call to the valv/rod nr to execute.
I've created a function block using CFC. and a input-variable to call. Global variables for global usage
The message (Telegram) is read, if any exists every 500ms,
The total executiontime for functionValv() is 70 sec.
After 60 sec I want to place another call to prepare execution of other programs/functions
first call |----------------------------------------------------||-----other exec----|
sec call |---------------------------------------------------||---
In my CASE steg OF
1:
functionValve( en:=Enabled, parameterArray:= parameters);
2:
functionValve( en:=Enabled, parameterArray:= parameters);
...
OR
functionValv1:functionValv();
CASE steg OF
1:
functionValve1( en:=Enabled, parameterArray:= parameters);
2:
functionValve2( en:=Enabled, parameterArray:= parameters);
...
OR
funcArray[1] := functionValv1;
funcArray [2] functionValv2;
CASE steg OF
1:
funcArraysteg;
2:
funcArraysteg;
....
Now my question is,
What would be the working and best way to create the calls?
/anders
Hi to myself
I've managed to resolve my problem, as to understanding that:
I can have one implementation of my function block and
I've also understood that I have to make input assignment to make a controlled usage, ie I'm creating my own datatype, make variables and configure them on startup and modify during runtime and use as input on function calls.
What I don't understand sofar is how the memory usage is for my instances above. Will I run out of memory a.s.o.
Time will tell
/a
If the platform is PC based you are swimming in a vast sea of bytes and will take quite some time before you reach any shore.