S
when an error is created between PV and SP, does all the modes P, I & D act simultaneously on the error or one by one.
Most texts explains the nature of PID output as the response being P initially (does it mean I and D are silent initially) and when the error does not diminsh (offset) 'I' acts (does it mean that P and D are silent now)?
But the single line diagrams explaining PID action, tell that error is acted upon simultaneously by all the three control modes. so why doesnt the 'I' action contribute initially at the time of error creation or why doesnt the P action contribute at the time of 'I' action.
Would a system be able to maintain setpoint with 'I' action alone? With 'P' action alone ofcourse there would be an offset.
Best Regards,
Student
Most texts explains the nature of PID output as the response being P initially (does it mean I and D are silent initially) and when the error does not diminsh (offset) 'I' acts (does it mean that P and D are silent now)?
But the single line diagrams explaining PID action, tell that error is acted upon simultaneously by all the three control modes. so why doesnt the 'I' action contribute initially at the time of error creation or why doesnt the P action contribute at the time of 'I' action.
Would a system be able to maintain setpoint with 'I' action alone? With 'P' action alone ofcourse there would be an offset.
Best Regards,
Student