dear experts ,

i am looking for deceleration or de ramp function in TIA v13 , please if possible share a sample program ..

thanks  

Hi

You can implement Your own ramp fairly easily:

1. assume you have a clock pulse i.e. 1 scan pulse every xxx ms i.e. every 50ms

2. to ramp to target:

if (Pulse AND IQ_Ramped_Value<I_Target) THEN
      IQ_Ramped_Value:=IQ_Ramped_Value+I_Ramp_Step;
      if (IQ_Ramped_Value>I_Target) THEN
              IQ_Ramped_Value:=I_Target;
      END_IF;
END_IF;

if (Pulse AND IQ_Ramped_Value>I_Target) THEN
         IQ_Ramped_Value:=IQ_Ramped_Value-I_Ramp_Step;
         if (IQ_Ramped_Value<I_Target) THEN
                IQ_Ramped_Value:=I_Target;
        END_IF;
END_IF;

the IQ_Ramped_Value must be linked to a STAT or DB, NOT a Temp!

Piotr.M

Hi

You can implement Your own ramp fairly easily:

1. assume you have a clock pulse i.e. 1 scan pulse every xxx ms i.e. every 50ms

2. to ramp to target:

if (Pulse AND IQ_Ramped_Value<I_Target) THEN
      IQ_Ramped_Value:=IQ_Ramped_Value+I_Ramp_Step;
      if (IQ_Ramped_Value>I_Target) THEN
              IQ_Ramped_Value:=I_Target;
      END_IF;
END_IF;

if (Pulse AND IQ_Ramped_Value>I_Target) THEN
         IQ_Ramped_Value:=IQ_Ramped_Value-I_Ramp_Step;
         if (IQ_Ramped_Value<I_Target) THEN
                IQ_Ramped_Value:=I_Target;
        END_IF;
END_IF;

 

the IQ_Ramped_Value must be linked to a STAT or DB, NOT a Temp!

 hi piotr m 

thanks for your reply , it is very much helpful for me ,  

but  what to do if we want to confined ramp and de ramp  by time , if want it should reach the set point in fixed time set point may be vary but we want ti fix the time .

like we want to run the ramp to 1 s and it should reach the set point in 1s all the time despite the change in set point .

please suggest ..

Hi veer dr,

Please see attachment. 

This FC accelerates and decelerates the setpoint.[In my application, it is AO command]. Hope it helps!!!!!!!

Hi

if you wany to reach target in 1s what you do:

1. check if setpoint has changed:
IF (Old_Setpoint<>Setpoint) {
      Ramp_Step = ABS(Ramped_Value-Setpoint)/Steps_Per_Second;
}
Old_Setpoint=Setpoint;

2. use ramp posted above as normal

The Steps_Per_Second is equal to 1/Time_Between_Pulses. for example pulse is every 50ms your steps_per_second is 20.

This will create a VARIABLE RAMP which will reach target within one second regardless od initial difference between setpoint and target.