I have a real problem to understand the difference between: FB & FC. HELPPPPPPPPPPPPPPPPPPPP
I REALLY NEED URGENT HELP (YES/NO answers will help also) ...
i'm a beginner in siemens 300/400 & i came from computer programming background and i made some simple applications on the S7-200.
Now, what i know / & what i'm confused about????
Confused Person
I REALLY NEED URGENT HELP (YES/NO answers will help also) ...
i'm a beginner in siemens 300/400 & i came from computer programming background and i made some simple applications on the S7-200.
Now, what i know / & what i'm confused about????
- FC does not have memory / FB has memory -> DB? Confusions:
- FC has inputs & outputs - why?
- what are the cases that it makes me use the FC's I/O
- can i assign "Q's/PLC outputs" to the FC outputs?
- if YES then if the FC call is conditioned, that means if the conditon is not fulfilled the Q-output will turn to ZERO - Yes/No?
- FB has memory and i can assign different DB's to it, e.g. motor control. fine that what i always read... Confusions:
- Does the DB works as a Memory Variable or to be more specific & clearer to me does it work as a Memory-Bit SET/RESET?
- if YES (in conditioned FB) means: if i assign an output-Q to an FB output and it was not called in another read-cycle => the output-Q will still be ON (ONE) - Yes/No?
- if NO then if a used a STAT variable within a DB, will it hold the values?
- does anyone really have this motor control - as an example project.
- if i make a code and i'm not sure of it, how can i try it without a real PLC (same like RUN is other programming languages)
- WHAT IS THE REAL DIFFERENCE BETWEEN FB & FC IN TERMS OF USES, please give example. in other words how can decide for this operation i definatly need an FC or FB ????
Confused Person
Last edited: