Mitsubishi Electric MELSEC Q Series User Manual page 46

3 SPECIFICATIONS
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(d) Precautions for auto tuning
The following indicate the conditions under which auto tuning will result in
abnormal termination.
1) Operation mode command (Yn1) has been turned off. (Except for the
case where PID continuation flag (buffer memory address: A9
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2) Any of the following setting items for the channel has been changed
during execution of auto-tuning.
Set value (SV) setting
Upper output limiter
Lower output limiter
Sensor compensation value setting
Primary delay digital filter setting
AUTO/MAN mode switching
AT bias
Forward/reverse action setting
Unused channel setting
3) Temperature process value (PV) (buffer memory address: 9
exceeds the measured temperature range (refer to section 3.5.4).
4) The following time exceeds 2 hours.
• Time elapsed from the auto-tuning start until the set value is reached
at the first time.
• A half of the hunting cycle
The value calculated by PID constants after auto-tuning exceeds any
of the following ranges.
5) Proportional section (P): 0.1 to 1000.0 (%)
Integral time (I): 1 to 3600 (s)
Derivative time (D): 0 to 3600 (s)
6) Forced PID control stop command (YnC to YnF) has been turned on.
7) Hardware failure has occurred.
8) Proportional band (P) setting (buffer memory address: 23
83
9) Upper setting limiter (buffer memory address: 37
Lower setting limiter (buffer memory address: 38
been changed and thereby the set value (SV) is outside the setting
range.
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Setting item
) has been changed to 0. (2-position control)
H
MELSEC-Q
Buffer memory address (Hexadecimal)
CH1 CH2 CH3
22 42 62
H H H
2A 4A 6A
H H H
2B 4B 6B
H H H
2D 4D 6D
H H H
30 50 70
H H H
32 52 72
H H H
35 55 75
H H H
36 56 76
H H H
3D 5D 7D
H H H
, 57 , 77
H H
, 58 , 78
H H
) is
H
CH4
82
H
8A
H
8B
H
8D
H
90
H
92
H
95
H
96
H
9D
H
to C )
H H
, 43 , 63 ,
H H H
, 97 ) or
H H
, 98 ) has
H H
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