Omron CQM1 Operation Manual page 279

Application
Executing Commands from a Programming Console
I/O Allocation Commands
1,2,3...
260
5. Parameters cannot be written and Manual Mode cannot be specified for
loops for which autotuning is being executed. An error response (EE00)
will be written to the input word if an attempt to do so is made.
After confirming acknowledgement of the autotuning command, change
the command code to an I/O allocation command other than one to set PID
parameters, e.g., a read–only command (C7@@).
• If the autotuning command is left in the output word, autotuning will be
repeated as soon as it has been completed.
• After the autotuning command has been acknowledged, the setting for
the I/O allocation command just prior to the operation control com-
mand will be valid for the output word. The following is an example of
this.
a) An I/O allocation command is written to the output word to set the pro-
portional band.
b) The autotuning command is executed and command reception ac-
knowledged.
c) The set value for the proportion band (50.0) is written to the output
word. Although autotuning will set the PID parameters according to au-
totuning results, here the value will be immediately changed to 50.0 as
a result of the I/O allocation command set before autotuning.
6. The set point will be written to EEPROM when the CEEA command is ex-
ecuted. The set point may not be written correctly if power is interrupted
during the write operation. At least 60 ms is required to complete the write
operation after the CEEA command is executed. Always be sure to confirm
the Command Acknowledgment Flag in the input word when writing the set
point to EEPROM.
The following words are allocated to the Temperature Control Unit in these
examples:
Input word = IR 001
Output word = IR 100
The following procedure would be used to write a set point of 100 C for loop 1
and then monitor the process value for loop 1.
1. Start by monitoring IR 001 and IR 100 on the Programming Console.
? ?
2. Write "C071" to the output word to specify setting the set point and reading
the process value.
"C071" will be written to the input word to acknowledge the command.
? ?
+ % + %
3. Write the set point for loop 1 (100 C) to the output word.
The process value for loop 1 will be written to the input word, indicating that
the write operation has been completed.
? ?
#
Section 2-6