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I'm new to CoDeSys and have a couple of questions regarding ST:
1.
Is it so that structures have to be declared as DUTs. Is it not possible to declare structures as "private" to for instance a FB or FC? Is there a workaround?
2.
Is it so that the AT instruction can only be used to reference physical addresses (%?I, %?Q etc.) It cannot be used to reference variables for instance in a FB? Suppose POINTER is foreseen for this kind of functionality?
3.
For class (FB) instances I've planned to use VAR_INPUT CONSTANTS to adapt each instance (see below). What is the best way to do this besides initializing instance data in the VAR section of the POU?
Seems to be a couple of bugs in the 3.5 Patch 1 version also:
- VAR_INPUT CONSTANT shows up in CFC. Menu option Parameter is not available.
- In paged CFC, a block rearrange with no pages selected erases all pages. Seems to be no way to get them back/visible again......
- Inserting a "composer", "selector","box" etc. in CFC and then deleting it again crashes CoDeSys (if abort is selected).
I'm looking at the perspective of converting 150+ Simatic SCL (the proper SCL, not the TIA cra??? SCL) blocks into CoDeSys/TwinCAT ST..... and the perspective looks grim......
ossa
1.
Is it so that structures have to be declared as DUTs. Is it not possible to declare structures as "private" to for instance a FB or FC? Is there a workaround?
2.
Is it so that the AT instruction can only be used to reference physical addresses (%?I, %?Q etc.) It cannot be used to reference variables for instance in a FB? Suppose POINTER is foreseen for this kind of functionality?
3.
For class (FB) instances I've planned to use VAR_INPUT CONSTANTS to adapt each instance (see below). What is the best way to do this besides initializing instance data in the VAR section of the POU?
Seems to be a couple of bugs in the 3.5 Patch 1 version also:
- VAR_INPUT CONSTANT shows up in CFC. Menu option Parameter is not available.
- In paged CFC, a block rearrange with no pages selected erases all pages. Seems to be no way to get them back/visible again......
- Inserting a "composer", "selector","box" etc. in CFC and then deleting it again crashes CoDeSys (if abort is selected).
I'm looking at the perspective of converting 150+ Simatic SCL (the proper SCL, not the TIA cra??? SCL) blocks into CoDeSys/TwinCAT ST..... and the perspective looks grim......
ossa
