Unit - Omron CJ Series Operation Manual

Sample Programs
Performing Autotuning and Refreshing the PID Constants
Summary
This program performs autotuning for loop 1 and refreshes the Temperature Control Unit's PID constants with
the calculated PID constants.
Example Unit Settings

• Unit:

CJ1W-TC001 Temperature Control Unit
• Unit number: 00
Note The unit number switches are on the front of the Unit. Refer to 2-3-3 Unit Number Switches for details.
Example Program
Execution
Loop 1 AT Flag
condition
CIO 200803 (See note 1.)
(Starts AT)
Loop 1 AT Flag
CIO 200803 (See note 1.)
Loop 1 PID Constants Calculated Flag
CIO 200810 (See notes 1 and 3.)
Loop 1 Save Completed Flag
CIO 200815 (See notes 1 and 4.)
Note 1. The Loop 1 AT Flag is bit 03 of CIO (n+8), the Loop 1 PID Constants Calculated Flag is bit 10 of
CIO (n+8), and the Loop 1 Save Completed Flag is bit 15 or CIO (n+8).
2. The Loop 1 Start AT Bit is bit 02 of CIO (n+2) and the Loop 1 Change PID Constants Bit is bit 13 of
CIO (n+2).
3. The PID Constants Calculated Flag will go OFF when the Change PID Constants Bit is turned ON.
4. If pin 8 of the DIP Switch is set to ON so that the settings in the Unit's EEPROM are transferred to the
CPU Unit during initialization, always turn ON the loop's Save Bit to save the new settings to Temper-
ature Control Unit's EEPROM.
Loop 1 Start AT Bit
CIO 200202 (See note 2.)
AT in Progress
Indicator Flag
XFER(070)
#0003
D20035
D20015
Loop 1 Change PID
Constants Bit
CIO 200213
(See notes 2 and 3.)
Save
SET
(See note 4.)
200215
Save
RSET
(See note 4.)
200215
Appendix B
87