help on SCL

Raffy

... I want to a program that would eventually give a pulse 1s on and2s off about 10 times...I used for loop and timers but I guess there is something wrong with my program..could somebody help me...

here is my program:

IF TRIP_CAUSE AND RPM <= 200 THEN

FOR X:= 1 TO 10 BY 1 DO
T_VAL := S_ODT(T_NO:= TIMER_X, S := TRUE, TV := T#1S , BI:=biVal, R:= FALSE, Q := BRAKE);
T_VAL := S_ODT(T_NO:= TIMER_X, S := FALSE, TV := T#2S , BI:=biVal, R:= TRUE, Q := BRAKE);
END_FOR;
ELSE
BRAKE := FALSE;

END_IF;

Thre is a question to clear that?Are those pulse pattern identical?Another points to use timers, each timer ( I mean timer assign with a number e.g T18) should be assigned for an individual task.If your pulses are identical,do it once and copy the waveform via binary logic.If they are different, I guess you can use loop indirect addressing for timer (I should check this).

Raffy

Yes, those pulses are identical and I would like to repeat the pulse (1secondON and 2seconds OFF) for 10 times...... that is why I thought I could use aFOR loop... but I guess theFOR loop does not do the trick...or having the same timer for the pulse is not going to work...i'm working on making it two timers...to trigger a 1 second ON and 2 seconds OFF...and maybe a counter to count the pulse and stop it on 10...but I think there is a better way when using SCL...

Thanks for the advice...

Best regards,

raffy

• Use clock of CPU with simple counting tricks to enable outputs and that is possible in SCL,of course the simplest way.
• You can use 2 or more timers as your requirement needs to create one prototype and just copy that to all binary addresses you want via assign instruction in SCL, that is also easy and possible
• The last solution is difficult and I think waste of resources in a CPU to use such a huge numbers of Timers and put such load on CPU to parallel execute loop.I think that is possible with some programming labour but the strategy is not wise (in my opinion).
  

Raffy

Hi hd,

I would like to try your 1st suggestion....it would be easier if I do that...I might use the bit 7 and bit 5 of the clock memory bits....but there would be complications on the logic...

I'm thinking on how to cascade the bit memory...do you have any suggestion??

Thanks for the help....


raffy

What do you mean by cascading?For my first suggestion, I may use a short pulse as possible while considering where I implement the program.For using in OB1,I suggest the 6th bit(1HZ) or 4th bit (2HZ) .I will give you a sample if you wait.See the attachment to see what we should achieve!

Raffy

Thanks hd,

Now I do understand your program..we dont need counters and timers here just clock bits...thank you very much now I just need some adjustments here..


best regards,


raffy

Thank you for your feedback.If small error doesn't matter in your application, use my rough version otherwise use timers and counter.But I think it is waste of resources.