STL for S5

Dear All

Could any body help me...

Im' not familiar with STL S5 (I have been accustomed using Ladder diagram), now I still get dificulty to understand STL like snipset such below one

:BLD 131
:AN T9
:L KT 25.0
:SE T9
:CU C1
:L C1
:T FY252
:A F252.0
:= F5.0
:A F252.1
:= F5.1
:A F252.2
:= F5.2
:A F252.3
:R C1


Could anybody makes me clear to understand that code (I feel so happy if you explain me with ladder).


My best regard


Joko Suntoro

Here's a ladder version but it's in Step 7. You should be able to see what is happening. The trick to get back to ladder is to re-create the logic using the ladder editor and then switch between ladder/stl representation to see what is going on and compare it with the original logic.

:BLD 131 //bild = screen-instruction; normaly has nothing to do with
// the plc-program

:AN T9 // and not Timer 9
:L KT 25.0 // load time 25x (.3=x10s / .2=x1s / .1 =x0.1s /
// .0=x0.01s
:SE T9 // set einschalt = on-delay

:CU C1 // count up Counter1 (if AN T9)

:L C1 // load always countervalue-C1
:T FY252 // transfer always to flag (F) byte (Y) 252

:A F252.0 // and flag 252.0
:= F5.0 // equals flag 5.0

:A F252.1
:= F5.1

:A F252.2
:= F5.2

:A F252.3
:R C1 // reset counter C1 to zero


p.s. I'm half sleeping so if somebody see's an error...by my guest to correct me....I'm off to sleep


p.s. 2: I'm sleeping.☯ .. I did not see 'L D''s answer... I hope I get home in one piece...

Thank's a lot for all of your attention...

:BLD 131 "Change to STL"
:AN T9 " and not timer 9"
:L KT 25.0 "load a constant of 250ms into timer
:SE T9 "Timer T9 start as extended pulse"
:CU C1 "Count up Counter 1"
:L C1 " load the value of counter 1 *BCD*
:T FY252 " transfer to flag byte 252" 250 to 255 are used as scratch area by siemens standard blocks"
:A F252.0 move the bcd value (4 bits) to flags 5.0-5.3
:= F5.0
:A F252.1
:= F5.1
:A F252.2
:= F5.2
:A F252.3
:R C1 "if count = 8 bit 3 of counter on then reset counter.

In stl you can create a segment (rung) upto 255 instructions long this will not convert into ladder, however if you insert a bld255 instruction after SE T9 & remove the BLD131 it will convert the timer bit into ladder in a seperate segment but you will have to make sure that the following segments if converted have the right rlo (result of logical operation i.e. A T9 CU C1 etc.
I once converted a program written entirely on an old 100u using the handheld into ladder by uploading into a PG then adding the bld255 instructions.