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

Refer to the description of autotuning in the section on the PIDAT instruction (page 2-664) for
details.
 SampTime (Sampling Period)
This is the minimum value of the period for heating/cooling PID processing.
Refer to the description of the execution timing of heating/cooling PID processing for details. Heat-
ing/cooling PID processing is not performed again until the time specified for SampTime has
elapsed since the last time heating/cooling PID processing was performed.
 RngLowLmt (Lower Limit of Input Range) and RngUpLmt (Upper Limit of
Input Range)
These are the lower limit and upper limit of PV and SP. An error will occur if the value of the param-
eter connected to PV or SP exceeds either of these limits. RngLowLmt must always be less than
RngUpLmt.
 DirOpr (Action Direction)
This instruction does not use this variable. Any value that is set is ignored.
 CtlPrd_Cool (Control Period)
This variable sets the control period for time-proportional output of MV_Cool when you use this
instruction together with the TimeProportionalOut instruction (page 2-727). Set the same value here
and for control period CtlPrd of the TimeProportionalOut instruction.
If you do not use time-proportional output for MV_Cool, set the default value, T#20s.
 ProportionalBand_Heat and ProportionalBand_Cool (Proportional Bands)
This is one of the three PID constants. Refer to the description of the proportional action in the sec-
tion on the PIDAT instruction (page 2-664) for details.
If the values of ProportionalBand_Heat and ProportionalBand_Cool are large, the offset will be
large. Hunting occurs if a proportional band is too small.
 IntegrationTime_Heat and IntegrationTime_Cool (Integration Times)
This is one of the three PID constants. Refer to the description of the integral action in the section on
the PIDAT instruction (page 2-664) for details.
The larger the value of IntegrationTime_Heat or IntegrationTime_Cool is, the weaker the integral
action is.
 DerivativeTime_Heat and DerivativeTime_Cool (Derivative Times)
This is one of the three PID constants. Refer to the description of the derivative action in the section
on the PIDAT instruction (page 2-664) for details.
The larger the value of DerivativeTime_Heat or DerivativeTime_Cool 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, MV is set to the value of ManMV only when it changes after operation switches to manual
operation.
The value of MV immediately after changing from automatic to manual operation will be the value of
MV_Heat if that value is positive and the value of MV_Cool otherwise.
Also, the value of MV immediately after changing from manual to automatic operation will be the
value of MV_Heat if that value is positive and the value of MV_Cool otherwise.

NY-series Instructions Reference Manual (W560)

2 Instruction Descriptions
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