Basic Instruction Glofa ladder diagram programming tutorial part II : Up Counter (CTU)

Dear all hands,

It’s the third my posting about glofa ladder programming tutorial. So you can see this post as successor of my second post about glofa programming tutorial.In this post I want to talk about CTU or up cainter basic instruction. Basically CTU is incremental counter.

Ladder symbol for CTU (UpCounter).

Explanantion :

CU : Up counter pulse input, : triggering input for start increment counting,

R : Reset input, when its value is , CV value will reset back to zero..

PV : Preset Value,: counter maximum setting value, type data integer with value range between :-32768 – 32768

Q : Up counter output, counter output that will be executed if CV value reach PV value.

CV : Current Value, recent counter value being displayed.

Ladder diagram example for CTU :

In glofa ladder diagram above, Counter PV value is 10, when “%Q0.0.0” on, then counter will start count from 0 to 10, when CV reach its max value (10), then output counter (OUT1) will on, its make output “%Q0.0.0” also on and PV value will reset back . If. Jika input “%I0.0.1” (reset input) on, then i current value (CV) will also back to zero.