IDEC MicroSmart Pentra - Manual (Page 31)

PID M ODULE M AIN F UNCTIONS
4-8 FC5A MicroSmart PID Module User’s Manual FC9Y-B1283
Cancel Auto-tuning (AT)
To cancel auto-tuning (AT) while it is performed, turn off Auto-tuning (AT)/Auto-reset bit (Bit1) of the
operation parameter. When the operation parameter Bit1 is turned off, auto-tuning (AT) is canceled, and
the Auto-tuning (AT)/Auto-reset LED (AT0/AT1) will go off. When auto-tuning (AT) is cancelled, P, I, D and
ARW values are reverted to the original values at the time that auto-tuning (AT) was started.
Perform Auto-reset
To perform auto-reset, turn on Auto-tuning (AT)/Auto-reset bit (Bit1) of the operation parameter. The reset
value will automatically be configured and the offset is corrected. During auto-reset is performed, the
Auto-tuning (AT)/Auto-reset LED (AT0/AT1) flashes.
Auto-reset cannot be cancelled.
Auto-tuning (AT)/Auto-reset Program Example
The ladder program and the timing chart below describe an example of performing and canceling
auto-tuning (AT)/auto-reset of CH0. In this example, D1000 is allocated to the control register and M1000
is allocated to control relay.
Ladder Program
Timing Chart
Notes
• Auto-tuning (AT)/Auto-reset bit is automatically turned off when Auto-tuning (AT)/Auto-reset is completed.
• If Auto-tuning (AT)/Auto-reset bit is kept on, Auto-tuning (AT)/Auto-reset will be performed continuously. Use
SOTU and SET instructions to turn on Auto-tuning (AT)/Auto-reset bit so that auto-tuning (AT)/auto-reset is
performed only once.
• If auto-tuning (AT) is cancelled while it is performed, P, I, D, and ARW values will be reverted to the original values
at the time that auto-tuning (AT) was started.
• Auto-reset cannot be cancelled.
When external input I0 is turned on, CH0
operation parameter Bit1 is set, and
Auto-tuning (AT)/Auto-reset will be started.
When external input I1 is turned on, CH0
operation parameter Bit1 is reset, and
Auto-tuning (AT) will be cancelled.
Control Enable/Disable Bit
D1022.0
Auto-tuning (AT)/Auto-reset
Perform/Cancel Bit
D1022.1
Auto-tuning (AT)/Auto-reset
Perform/Cancel Bit (Monitor)
D1009.1
Auto-tuning is started when Auto-tuning
(AT)/Auto-reset Perform/Cancel bit
(D1022.1) is turned off to on.
Auto-tuning (AT)
cannot perform
while Control is
disable.
If auto-tuning (AT) is cancelled while
it is performed, the P, I, D and ARW
values will be reverted to the original
values at the time that auto-tuning
(AT) was started. When auto-tuning (AT) is completed:
•
The P, I, D, and ARW values
will be updated.
•
Auto-tuning (AT)/Auto-reset
Perform/Cancel bit (D1022.1) will
be automatically turned off.
ON
OFF
ON
OFF
ON
OFF