RKC INSTRUMENT Z-TIO-G, Instruction Manual

Page: 122 / 246

9. COMMUNICATION DATA DESCRIPTION
IMS01T28-E4
9-14
Continued from the previous page.
 Requirements for Autotuning (AT) cancellation
If the Autotuning (AT) is canceled according to any of the following conditions, the controller immediately
changes to PID control.
The PID values will be the same as before Autotuning (AT) was activated.
When the Operation is
transferred
When the RUN/STOP mode is changed to the STOP mode.
When the PID/AT transfer is changed to the PID control.
When the Auto/Manual mode is changed to the Manual mode.
When the Remote/Local mode is changed to the Remote mode.
Operation mode [Identifier: EI]
(P. 9-37)
When changed to Unused, Monitor, or the M Event function.
When the parameter is
changed
When the temperature set value (SV) is changed.
When the PV bias, the PV digital filter, or the PV ratio is changed.
When the AT bias is changed.
When the control area is changed.
When high or low output limit value is changed
When the input value becomes
abnormal
When the Measured value (PV) goes to underscale or overscale.
When the Measured value (PV) goes to input error range.
(Measured value (PV)

Input error determination point (high) or Input error
determination point (low)

Measured value (PV))
When the AT exceeded the
execution time
When the AT does not end in two hours after AT started
Power failure
When the power failure of more than 4 ms occurs.
Instrument error
When the instrument is in the FAIL state.
Parameters for Autotuning (AT) are provided to compute the PID values suitable for various
controlled systems and control actions. Set them, as required.
Example 1: When you want to find each constant suited for P control, PI control, or PD control by
autotuning.
For P control:
Set “0” to Integral time limiter (high) and Derivative time limiter (high).
For PI control:
Set “0” to Derivative time limiter (high).
For PD control:
Set “0” to Integral time limiter (high).
When Autotuning (AT) is executed by making the settings above, the control constants suited
for P, PI, or PD control are found.
Example 2: When you want to limit on/off output only at Autotuning (AT)
Autotuning (AT) that limits the ON/OFF output values only at Autotuning (AT) can be
executed by setting the output value with AT turned on and the output value with AT turned
off.