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

2 Instruction Descriptions
 DerivativeTime (Derivative Time)
This is one of the three PID constants. Refer to the description of the derivative action for details.
The larger the value of DerivativeTime is, the stronger the derivative action is.
 ManMV (Manual Manipulated Variable)
MV is set to this value during manual operation (while ManCtl is TRUE). However, immediately after
changing from automatic to manual operation, the value of MV from automatic operation is used.
MV is set to the value of ManMV only when it changes after operation switches to manual operation.
When operation changes from manual to automatic operation, the value of MV from manual opera-
tion is used. The value of ManMV does not have to be between MVLowLmt and MVUpLmt.
MV
ManCtl changed to TRUE.
Value of ManMV changed.
 ATDone (Autotuning Normal Completion)
This flag indicates when autotuning was completed normally. It changes to TRUE when autotuning
is completed normally and remains TRUE as long as the value of StartAT is TRUE. It is FALSE in
the following cases.
• An autotuning error end occurred.
• Autotuning is in progress (i.e., while the value of ATBusy is TRUE).
• PID control is in progress without autotuning.
• PID control is not in progress (i.e., the value of Run is FALSE).
• The value of StartAT is FALSE.
 ATBusy (Autotuning Busy)
This flag indicates when autotuning is in progress. It is TRUE while autotuning is in progress. Other-
wise it is FALSE.
 MV (Manipulated Variable)
This is the manipulated variable that is applied to the controlled system.
Introduction to PID Control
PID control is a feedback control method that repeatedly measures the process value of the controlled
system and calculates a manipulated variable so that the process value approaches a set point. This
instruction therefore outputs a manipulated variable for the following inputs: process value, set point,
and calculation parameters. PID control periodically measures the process value, calculates the manip-
ulated variable, and outputs the manipulated variable so that the process value approaches the set
point.
2-670
Value of MV from automatic operation used.
Value of MV from manual operation used.
ManCtl changed to FALSE.
Time

NY-series Instructions Reference Manual (W560)