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35 CPU MODULE BUILT-IN ANALOG FUNCTION
35.6 Function (PID Control Via Parameter)
• Heating-cooling PID control (ambient temperature setting function enabled, target value ambient temperature)
• Heating-cooling PID control (ambient temperature setting function enabled, target value < ambient temperature)
■Execution and stop conditions for auto tuning
The following table shows the execution and stop conditions for using auto tuning.
When the ambient temperature setting function is enabled, auto tuning is completed after execution of 2.5 cycles. The third cycle starts in the middle of the
second cycle, and ends completely when 2.5 cycles are executed.
When the ambient temperature setting function is enabled, auto tuning is completed after execution of 2.5 cycles. The third cycle starts in the middle of the
second cycle, and ends completely when 2.5 cycles are executed.
Execution condition Stop condition
• "To Use or Not to Use Auto-tuning" is set to "Auto tuning used".
• "PID Control Execution Command" is set to "PID control executed".
• The upper limit output limiter/heating upper limit output limiter/cooling upper
limit output limiter is set to 1 (0.1%) or larger.
• The lower limit output limiter is set to 999 (99.9%) or smaller.
• When "PID Control Execution Command" is set to "PID control not
executed" (Stopped)
• When the target value (SV) is changed
• When the value for the upper limit output limiter/lower limit output limiter is
changed
• When auto tuning does not end even after approximately two hours have
elapsed after its start
• When the sampling time is changed
• When the cooling control output cycle setting, heating control output cycle
setting, or cooling control output cycle setting is changed
• When the module operation status turns into the PAUSE state
OFF
ON
ON
OFF
Measured value (PV)
1st cycle 2nd cycle 3rd cycle
Adjustment sensitivity
(±0.1)
Target value
(SV)
Time
Control output
(heating control)
Control output
(cooling control)
OFF
ON
ON
OFF
Measured value (PV)
1st cycle 2nd cycle 3rd cycle
Adjustment sensitivity
(±0.1)
Target value
(SV)
Time
Control output
(heating control)
Control output
(cooling control)
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