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the variable sReceive in fbUdpR is a input variable. Why in declare section is a VAR_OUT variable?
Best Regards
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Anonymous
-
2016-04-19
Originally created by: scott_cunningham
If you used the auto declare functionality, the cursor starts in the variable type and you can accidentally change it from VAR to VAR_IN or VAR_OUT. I have done this a few times myself. Just change it to the required type you need.
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I have to say: I have copied this code. My question is conceptual.
What is your opinion? sReceive is VAR_OUT variable?
Thank you very much.
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Anonymous
-
2016-04-19
Originally created by: scott_cunningham
It could be - depending on if there is other code that sets the variable. In general, VAR_OUT simply means it's a variable that can be read outside of the POU and cannot be written. It certainly can be assigned as an input to some internal code.
Here is a post I just made that uses a VAR_OUT (Output) as an input to a FB (PulseTimer) inside my POU: l viewtopic.php?f=2&t=6856#p14739 l
VAR_INPUT = variable the POU can use that is set externally (i.e. TON(EN:=TRUE) ... EN is an input variable)
VAR_OUTPUT = variable the POU can use and set that is visible externally (i.e. TON(Q => Done) ... Q is an output variable)
VAR_IN_OUT = variable the POU can use and set that also can be set externally (so both the POU and user code can change it)
VAR = internal variable to the POU that is NOT visible externally (only visible in debug mode)
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Hi as you can see,
the variable sReceive in fbUdpR is a input variable. Why in declare section is a VAR_OUT variable?
Best Regards
Originally created by: scott_cunningham
If you used the auto declare functionality, the cursor starts in the variable type and you can accidentally change it from VAR to VAR_IN or VAR_OUT. I have done this a few times myself. Just change it to the required type you need.
I have to say: I have copied this code. My question is conceptual.
What is your opinion? sReceive is VAR_OUT variable?
Thank you very much.
Originally created by: scott_cunningham
It could be - depending on if there is other code that sets the variable. In general, VAR_OUT simply means it's a variable that can be read outside of the POU and cannot be written. It certainly can be assigned as an input to some internal code.
Here is a post I just made that uses a VAR_OUT (Output) as an input to a FB (PulseTimer) inside my POU: l viewtopic.php?f=2&t=6856#p14739 l
VAR_INPUT = variable the POU can use that is set externally (i.e. TON(EN:=TRUE) ... EN is an input variable)
VAR_OUTPUT = variable the POU can use and set that is visible externally (i.e. TON(Q => Done) ... Q is an output variable)
VAR_IN_OUT = variable the POU can use and set that also can be set externally (so both the POU and user code can change it)
VAR = internal variable to the POU that is NOT visible externally (only visible in debug mode)