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MELSEC-Q
3 SPECIFICATIONS
3.5.26 AT bias (buffer memory address 53, 85: Un\G53, Un\G85)
(1) The auto tuning decides each PID constant by executing the ON/OFF operation
of control output and hunching the measured value.
Set the AT bias, if the overshoot of this hunching is not suitable for the control
target.
(2) This setting is made to perform auto tuning centering on a shifted point (AT
point).
Make this setting when shifting the point of the set value (SV) for auto tuning.
(3) Set the range which has minimal PID operation fluctuations and will not affect
the control results.
Otherwise, exact PID constants may not be provided depending on the object to
be controlled.
[Setting of AT bias on negative side (for reverse action)]
t
Process value (PV)
AT bias
AT point
Set value (SV)
(4) The setting range is
full-scale.
3.5.27 Forward/reverse action setting (buffer memory address 54, 86: Un\G54, Un\G86)
(1) Sets whether each channel of the Q62HLC will be used for forward or reverse
action.
• Forward action (cooling control): 0
• Reverse action (heating control): 1
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