Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 1149

Operand: (s3)
Device Item
*1
+23 Output variation (decrease) alarm setting
value
Output lower limit setting value
*1
+24 Alarm output
*2
+25 PV value threshold (hysteresis) width
(SHPV)
*2
+26 Output upper limit value (ULV)
*2
+27 Output lower limit value (LLV)
*2
+28 Wait time setting parameter from the end of
tunning cycle to the start of PID control
(K )
W
*1 Occupied when the bit 1 of (s3)+1 (Action direction (ACT)) is 1, the bit 2 is 1, or the bit 5 is 1.
*2 Occupied when the bit 6 of (s3)+1 (Action direction (ACT)) is 1 (limit cycle method).
Operation error
Error code Description
(SD0)
11A0H A value set for the sampling time (T
A value set for the input filter constant () is out of the range,  < 0 or 100  .
11A1H
11A2H A value the proportional gain (K
11A3H A value set for the integral time (T
11A4H A value set for the derivative gain (K
11A5H A value set for the derivative time (T
11A6H A value set for the sampling time (T
11A7H The process value variation (PV) overflowed.
11A8H Deviation (EV) overflowed.
11A9H The calculated integral value overflowed.
11AAH The derivative gain (K
11ABH The calculated derivative value overflowed.
11ACH The PID operation result overflowed.
11ADH A value less than the output lower limit value is set for the output upper limit value.
11AEH A value less than 0 is set for the input variation alarm setting value or output variation alarm setting value.
11AFH ■Step response method
Improper auto tuning result
• The deviation at the start of auto tuning (step response method) is 150 or less.
• The deviation at the end of auto tuning (step response method) is one-third or more of the deviation at the time of start.
11B0H ■Step response method
Auto tuning operation direction mismatch
• The action direction estimated according to the relation between the set value (SV) and the process value (PV) at the start of auto
tuning (step response method) and the action direction of the manipulated value (MV) did not match.
■Step response method
11B1H
Improper auto tuning operation
• Auto tuning (step response method) failed to operate correctly because the process value (PV) did not change properly.
11B2H ■Limit cycle method
A value equal to or less than the output lower limit value (LLV) is set for the output upper limit value (ULV) for auto tuning (limit cycle
method).
Description
0 to 32767
-32768 to 32767
Bit 0 0: Input variation (increase) not exceeded
1: Input variation (increase) exceeded
Bit 1 0: Input variation (decrease) not exceeded
1: Input variation (decrease) exceeded
Bit 2 0: Output variation (increase) not exceeded
1: Output variation (increase) exceeded
Bit 3 0: Output variation (decrease) not
exceeded
1: Output variation (decrease) exceeded
Set according to the fluctuation of the
process value (PV).
Upper limit (ULV) of the manipulated value
(MV)
Lower limit (LLV) of the manipulated value
(MV)
-5 to 32717 [%]
) is out of the range, T
S
) is out of the range, K
P
) is out of the range, T
I
) is out of the range, K
D
) is out of the range, T
D
) is less than the operation cycle of the programmable controller.
S
) value overflowed.
D
Remarks
Enabled when the bit 2 of (s3)+1 (Action direction
(ACT)) is 1, and the bit 5 is 0.
Enabled when the bit 2 of (s3)+1 (Action direction
(ACT)) is 0, and the bit 5 is 1.
Enabled when the bit 1 of (s3)+1 (Action direction
(ACT)) is 1, or the bit 2 is 1.



Occupied when the bit 6 of (s3)+1 (Action direction
(ACT)) is 1 (limit cycle method).
 0.
S
< 0.
P
< 0.
I
< 0 or 201  K
.
D D
< 0.
D
9 PID OPERATION INSTRUCTION
9.2 PID Operation Instruction
9
1147