Nj-Series Instructions Reference Manual (W502 - Omron NJ501-1500 Reference Manual

2 Instruction Descriptions
Name Meaning
ATDone Autotuning nor-
mal completion
ATBusy Autotuning
busy
MV Manipulated
variable
*1 Value of input range lower limit InitSetParams.RngLowLmt to Value of input range upper limit InitSetParams.RngUpLmt
*2 Digits below 0.0001 s are truncated.
*3 FALSE indicates an error end, that PID control is in progress without autotuning, or that PID control is not in progress.
Bit strings
Run OK
ManCtl OK
StartAT OK
PV
SP
OprSet
Params
InitSet
Params
Propor-
tional Band
Integration-
Time
Deriva-
tiveTime
ManMV
ATDone OK
ATBusy OK
MV
Function
The PIDAT instruction performs PID control of a manipulated variable for a temperature controller or
other device. PID control is started when the value of execution condition Run changes to TRUE. While
the value of Run is TRUE, the following process is repeated periodically: process value PV is read, PID
processing is performed, and manipulated variable MV is output. PID control is stopped when the value
of Run changes to FALSE.
Autotuning is supported to automatically find the optimum PID constants. When the value of the auto-
tuning execution condition StartAT changes to TRUE, the PID constants are autotuned.
2-394
I/O Description
TRUE: Normal completion
*3
FALSE:
TRUE: Autotuning
Output
FALSE: Not autotuning
Manipulated variable
Integers
Refer to Function for details on the structure _sOPR_SET_PARAMS.
Refer to Function for details on the structure _sINIT_SET_PARAMS.
Valid range
Depends on data type.
---
−320 to 320
%
Times, durations,
dates, and text strings
OK
OK
OK
OK
OK
OK
OK

NJ-series Instructions Reference Manual (W502)

Unit Default
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