Problem FB41 PID

rikita · Apr 12, 2015

hi , I'm trying to implement PID in step 7 using FB41.the FB41 is implemented in OB35. I know how to set parameters of PID also I know the inputs type, outputs type . the problem I get always max value at the output of the FB41 I dn't know why !
knowing that I set Kp=2 , Ti= 2s , Td= 500ms
taking SP = 2 and PV=1 I get at the output max value (LMN_PER=27648) where is the problem

JRW · Apr 12, 2015

Show a screenshot of your call

rikita · Apr 12, 2015

the FB41 is in OB35 , thnx for ur help

JRW · Apr 12, 2015

Are you using PV real or PV Per?
Are you sure this is set correctly ?
PV PER ON

rikita · Apr 12, 2015

JRW said:
Are you using PV real or PV Per?
Are you sure this is set correctly ?
PV PER ON

yes using PV_IN or PV_PER I get always the max value

JRW · Apr 12, 2015

With PV per off and a 50.0 SP
And a 45.0 to 55.0 PV - does your LMN still stay at 27648?

rikita · Apr 12, 2015

at 45° I get 27648
at 55 I get 0
with SP = 50

JRW · Apr 12, 2015

Ob35 at 100ms?

rikita · Apr 12, 2015

yes it is at 100 ms

I can't see where is the problm

JRW · Apr 12, 2015

Im putting together some screen shots
Wait a minute

rikita · Apr 12, 2015

ok thank you very much for your help

JRW · Apr 12, 2015

Heres a simple set up with the PID at defaults except for the inputs as shown

rikita · Apr 12, 2015

ok I'll try it now thanx a lot for your help

can u reupload in good quality lol I can't see all parametres sorry

JRW · Apr 12, 2015

another

rikita · Apr 12, 2015

how do you use PID control (the other window)?

Problem FB41 PID

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