Measured-Value Tracking; Control_Opts; Control_Opts Of Pid Block - GE FVP110 Maintenance Manual

Measured-value Tracking

Measured-value Tracking
Measured-value tracking, also referred to as SP-PV tracking, is the action of equalizing
the setpoint SP to the measured value PV when the block mode (MODE_BLK.actual) is
Man in order to prevent a sudden change in control output from being caused by a
mode change to Auto.
While a cascade primary control block is performing automatic control in Auto or Cas
mode, when the mode of its secondary control block is changed from Cas to Auto, the
cascade connection is opened and the control action of the primary block stops. The SP
of the primary controller can also be equalized to its cascade input signal CAS_IN in
this case.
The settings for measured-value tracking are made in the parameter CONTROL_OPTS
(Table 49).

CONTROL_OPTS

CONTROL_OPTS is a parameter that stipulates control options (Table 49).
Bit Options in CONTROL_OPTS
0 Bypass Enable
1 SP-PV Track in Man
2 SP-PV Track in Rout
SP-PV Track in LO or IMan
3
SP Track retained Target
4
5 Direct Acting
Track Enable
7
Track in Manual
8
Use PV for BKCAL_OUT
9
Table 49 CONTROL_OPTS of PID Block
Switch for activating the control action bypass
Equalizes SP to PV when MODE_BLK.target is set to Man.
Equalizes SP to PV when MODE_BLK.target is set to ROut.
Equalizes SP to PV when MODE_BLK.actual is set to LO or
IMan.
Equalizes SP to RCAS_IN or CAS_IN when MODE_BLK.target
is either in IMan, LO, Man or ROut and MODE_BLK.actual is
set to RCas or Cas.
Set the PID block to be a direct acting controller.
While this option is set, if the value of TRK_IN_D becomes 1,
the mode transfers to LO.
Set this option when the mode should be transferred to LO
even when MODE_BLK.target is set to Man. This option is
invalid when Track Enable option is not set.
Sets the value of PV in BKCAL_OUT and RCAS_OUT, instead
of the value of SP.
Description
163
PID Function Block