I believe that I don't get how to read the "flowchart" properly. Or at the very least, I am not confident that I can.
The old program was started/stopped by bit B3:0/8 "Start From Panel Mate", which if other conditions were TRUE, caused the B3:0/15 "System Latch" to be sealed ON.Then the system would run until the "System Cycle Counter" reaches its Preset Value, which is being adjusted every X seconds (as controlled by the Move on Rung 22) during the cycle by the Move instruction on Rung 23 from N11:39 to the C5:1 Counter Preset Value. N11:39 contains and is labeled as the Number of Intervals. N11:39 is not set within the program but may have been set by the HMI or "PM" (PanelMate?) device originally.
I am guessing you know this from line 0019 correct? That is the line I used to get the program to start as well. I read that as:
Code:
B3:0/15 = (
(
(
(B3:0/8 == TRUE) &&
(
(B3:1/12 == TRUE) ||(B3:1/13 == TRUE) ||(B3:1/14 == TRUE) ||(B3:1/15 == TRUE)
)
) || (B3:0/15 == TRUE)
) &&
(B3:0/13 == FALSE) &&
(B3:0/14 == FALSE) &&
(C5:1/DN == FALSE) &&
(B3:4/14 == FALSE)
);
So the "system latch" gets set when all these "PM" suffixed bits get set. In my current code I do set these "PM bits" and this does get the program going, but again not the timer. The "C5:1/DN" is called the "System Cycle Timer Done" bit in the register mapping.
I don't understand the C5 thing. There is a C5.0.PRE, C5.1, C5.1.PRE, C5.1/DN. From the notes these are the cycle presets, the actual cycle counter and the done flag I guess. So I guess these are just free running counters that can be preloaded to some value and then count up (?) until overflow and then stop and set the done bit. That's pure guessing. Or is it all manually controlled at "counter" is just a convenient name for a standard register that happens to count?
On line 0022, it does something with C5:1.ACC when the same system latch B3:0/15 is set if I read that line properly. Yes? There seems to be something done if T4:0/DN is false that I don't understand.
The "MOV" block has a source and destination. How do I read the "source" of that block? Not physically, I mean if I were to read aloud verbally that graphical block of code... N[N7:53]:[C5.1.ACC]. What is the "-21846" value? The "15" value? Is it storing that in the preset value of Timer 4?
I also understand at a basic level what you are saying happens on 0023, as that would make sense within the system. I just don't understand how you translated the pretty picture into that phrase.
This reminds me of when I was learning Chinese. It made no sense at the beginning, but after a few hundred characters it becomes much easier to understand the rest since the symbols all build on eachother.
I really appreciate the fast and constructive help. I try to do the same in areas I have competency in on other forums and I am glad communities like these exist.
