> Probably not more elegant, >=20 > But in my case I used 2 pidx tied to the same input > and then I use the HOLD on one to avoid windup. This is what I've done (in one case with 5 valves/PIDEs instead of 2) Only one of the PIDs is active at any time. Mark >=20 > -----Original Message----- > From: foxboro-bounce@xxxxxxxxxxxxx > [mailto:foxboro-bounce@xxxxxxxxxxxxx]On Behalf Of Jaime Claramunt R. > (Inforsa) > Sent: Thursday, December 23, 2004 11:49 AM > To: foxboro@xxxxxxxxxxxxx > Subject: [foxboro] Splitted range PID anti windup >=20 >=20 > Hi all, >=20 > I have a PID loop controlling a splitted range actuators, I mean, a = =3D > PIDXE > block which .out goes to 2 char funtions: one with in1=3D3D[0, 50, > 100%]:out1=3D3D[0, 100, 100%] and other with in2=3D3D[0, 50, =3D > 100%]:out2=3D3D[0, 0, > 100%]. >=20 > Sometimes the actuator connected to the second char (2) is closed =3D > manually > so we cannot count on it, so I connected a logic to pidxe=20 > HOLIM to limit =3D > the > .out at 50% to avoid windup during this (50to100) range. So it can =3D > "return" > in good way from top. > I have the feeling it's not right. >=20 > Is the pidxe still calculating errors and compensations=20 > despite HOLIM ?? =3D > I > have too heavy response fot this second actuator when is returned to = =3D > auto > (on). > Do you have some more "elegant" way to do it ? >=20 > thanks > Jaime Claramunt > INFORSA > =3D20 > =3D20 > ______________________________________________________________ > _________ > This mailing list is neither sponsored nor endorsed by=20 > Invensys Process > Systems (formerly The Foxboro Company). Use the info you=20 > obtain here at > your own risks. Read=20 http://www.thecassandraproject.org/disclaimer.html =3D20 foxboro mailing list: http://www.freelists.org/list/foxboro to subscribe: =3D mailto:foxboro-request@xxxxxxxxxxxxx?subject=3D3Djoin to unsubscribe: =3D mailto:foxboro-request@xxxxxxxxxxxxx?subject=3D3Dleave =3D20 =20 =20 _______________________________________________________________________ This mailing list is neither sponsored nor endorsed by Invensys Process Systems (formerly The Foxboro Company). Use the info you obtain here at your own risks. Read http://www.thecassandraproject.org/disclaimer.html =20 foxboro mailing list: http://www.freelists.org/list/foxboro to subscribe: = mailto:foxboro-request@xxxxxxxxxxxxx?subject=3Djoin to unsubscribe: = mailto:foxboro-request@xxxxxxxxxxxxx?subject=3Dleave =20 _______________________________________________________________________ This mailing list is neither sponsored nor endorsed by Invensys Process Systems (formerly The Foxboro Company). Use the info you obtain here at your own risks. Read http://www.thecassandraproject.org/disclaimer.html foxboro mailing list: http://www.freelists.org/list/foxboro to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave