Mitsubishi Electric MELSEC-Q Series User Manual page 43

3 SPECIFICATIONS
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(2) Executing auto tuning
(a) Conditions for starting auto tuning
When any of the following conditions is met, auto tuning can not be
executed.
1) In Unused channel setting (buffer memory address: 61, 93), 1
(Unused) is set for the channel.
2) Control mode (buffer memory address: 50, 82) is set in any of
manual control mode 1, manual control mode 2 or program control
mode.
3) Forced PID control stop command (YnC, YnD) is on.
4) A hardware failure is being detected. (The ERR. LED is on.)
5) A write error is being detected. (Xn2: ON)
6) The sensor is not connected correctly.
7) FeRAM backup start command (Yn8) is on.
8) Default setting registration start command (Yn9) is on.
9) In PID constant read command from FeRAM (buffer memory
address: 62, 94), 1 (With command) is set.
10) A bit of write flag (b4, b5) in PID constant read/write completion flag
from FeRAM (buffer memory address: 31) is on.
(b) Auto tuning procedure
POINT
Perform the following operation to use the set PID constants even after the
programmable controller CPU is powered off.
• Write the values directly to the buffer memory using a sequence program.
• Store the PID constants into FeRAM and transfer them when the programmable
controller CPU is powered on.
• Use the initial settings of GX Configurator-TC.
MELSEC-Q
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