YOKOGAWA ADMAG TI Series

<Appendix 5. PID Block>
288
IM 01E21A02-03EN
A5.13 Measured-value Tracking
Measured-valuetrackingisanactiontoequalizethesetpoint(SP)tothemeasuredvalue(PV)
whentheblockmode(MODE_BLK)isrunninginManinordertopreventasuddenchangein
control output from being caused by a mode change to Auto.
If the mode of the cascade secondary loop is changed from the Cas mode to the Auto mode
while the cascade primary loop is controlling in the Auto or Cas mode, the cascade connection is
openedandthecontrolactionoftheprimaryloopstops.Thesetpoint(SP)ofthesecondaryloop
canalsobeequalizedtoitscascadeinput(CAS_IN)bytracingthemeasuredvalue.
The settings for measured-value tracking are made in the parameter CONTROL_OPTS.
A5.13.1 CONTROL_OPTS
Setting contents of CONTROL_OPTS are shown.
Selection item for
CONTROL_OPT
Operation Contents
Bypass Enable This parameter allows BYPASS to be changed.
SP-PV Track in Man EqualizesSPtoPVwhenMODE_BLK.targetissettotheManmode.
SP-PV Track in ROut EqualizesSPtoPVwhentheROutmodeisspeciedwithMODE_BLK.target.
SP-PV Track in LO or IMan Equalizes SP to PV when Actual is the LO mode or the IMan mode.
SP Track retained Target
Equalizes SP to RCAS_IN when RCas bit is set in the target mode, and to CAS_
IN when Cas bit is set when the actual mode is IMan, LO, Man and ROut.
Direct Acting Set the PID block to a direct acting controller.
Track Enable TransitionstoLOifTRK_IN_Dbecomes1withthisoptionbeingset.
Track in Manual
With the previously mentioned Track Enable alone, this is not valid when the
target mode is Man. Sets this option even in Man when the user would like to
transition to LO. Even if this option is set while Track Enable is not set, there is no
e󰀨ect.
UsePVforBKCAL_OUT SetsthevalueofPVinBKCAL_OUTandRCAS_OUT,insteadofthevalueofSP.
Obey SP limits if Cas or
RCas
Puts the setpoint high/low limits in force in the Cas or RCas mode.
No OUT limits in Manual Disables the high/low limits for OUT in the Man mode.