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LDmicro Forum - can i miss a rung? |
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can i miss a rung? (by Alex)
Hello everyone, i have a question, if i have a ladder with 50 comparison instructions in 1 rung (see image attach please) and i set cycle time 1ms, can i miss some comparison instructions than using 10ms cycle time?
(no subject) (by Tom J.)
In the PIC configuration window I believe the available cycle time is limited by the oscillation frequency.
It shouldn't let you select a cycle time that doesn't work mathematically to have enough time to run the ladder from what I've noticed. I could be incorrect but I don't think so, if it's glitchy you could try running a faster crystal.
(no subject) (by MGP)
No, you never miss a rung, but you can only set 8 instructions in parallel and 8 instructions in series in 1 rung.
Ldmicro will give you a warning. But the program you have made is ugly ;) Use --[var>=1]--[var<=50]----(led)-
(no subject) (by Alex)
Thanks for your reply, so, with 1 ms it will work faster right? Because you can select cycle time 0, for faster operation
https://github.com/LDmicro/LDmicro/wiki/PLC-Cycle-Time-0 Pd: yeah my ladder is ugly :( but it was just a "bad" example to catch the idea, i didn't noticed it was wrong
(no subject) (by MGP)
Not always, depending on how many µs you have left.
You can measure that if you check the YPlcCycleDuty checkbox in the menue Settings how much faster that works.
(no subject) (by Ihor Nehrutsa)
Never You can miss(loss) a rung.
But You could skip over a rung or rungs (without any calculation inside rung) with GOTO command.
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