Ny-Series Instructions Reference Manual (W560 - Omron NY532-5400 Reference Manual

2 Instruction Descriptions
 ManResetVal (Manual Reset Value)
This is the value of MV when the deviation (i.e., the difference between PV and SP) is 0 for the pro-
portional action. The value of ManResetVal determines the location of the proportional action band.
When integral operation is performed, the manual reset value is ignored. Therefore, the setting of
ManResetVal is enabled when the value of IntegrationTime is 0.
 MVTrackSw (MV Tracking Switch)
MV tracking is a function that sets the MV to an external input value (called the MV tracking value)
during automatic operation. MV tracking is performed while the value of MVTrackSw is TRUE. When
the value of MVTrackSw changes to FALSE, the value of MV returns to the result of PID processing.
The value of MV is changed smoothly at this time (bumpless).
MV
MVTrackVal
MVTrackSw = TRUE
 MVTrackVal (MV Tracking Value)
This is the value to which MV is set during MV tracking. The value of MVTrackVal is limited by the
values of MVLowLmt and MVUpLmt.
 StopMV (Stop MV)
This is the value to which MV is set when the value of Run is FALSE (i.e., when execution of this
instruction is stopped).
 ErrorMV (Error MV)
This is the value to which MV is set when an error occurs (i.e., when the value of Error is TRUE). If
the value of ErrorMV is not within the valid range (−320 to 320), the value of MV will be 0 when an
error occurs.
 Alpha (2-PID Parameter α)
This parameter determines the coefficient of the set point filter. Refer to the description in 2-PID
Control with Set Point Filter on page 2-674 for details. Normally set the value of Alpha to 0.65.
 ATCalcGain (Autotuning Calculation Gain)
This variable gives the coefficient of the PID constants that were calculated by autotuning when they
are applied to the actual PID constants. If a value of 1.00 is specified, the results of autotuning are
used directly. Increase the value of ATCalcGain to give priority to stability and decrease it to give pri-
ority to response.
 ATHystrs (Autotuning Hysteresis)
This is the hysteresis that is used in the limit cycle for autotuning. More accurate tuning is achieved
if the value of ATHystrs is small. However, if the process value is not stable and proper autotuning is
difficult, increase the value. Refer to the description of autotuning for details.
2-668
Time
MVTrackSw = FALSE

NY-series Instructions Reference Manual (W560)