Mitsubishi Electric MELSEC iQ-R Series - Page 1149

9 PID OPERATION INSTRUCTION
9.2 PID Operation Instruction
1147
9
*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
+23
*1
Output variation (decrease) alarm setting
value
0 to 32767 Enabled when the bit 2 of (s3)+1 (Action direction
(ACT)) is 1, and the bit 5 is 0.
Output lower limit setting value -32768 to 32767 Enabled when the bit 2 of (s3)+1 (Action direction
(ACT)) is 0, and the bit 5 is 1.
+24
*1
Alarm output Bit 0 0: Input variation (increase) not exceeded
1: Input variation (increase) exceeded
Enabled when the bit 1 of (s3)+1 (Action direction
(ACT)) is 1, or the bit 2 is 1.
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

+25
*2
PV value threshold (hysteresis) width
(SHPV)
Set according to the fluctuation of the
process value (PV).
Occupied when the bit 6 of (s3)+1 (Action direction
(ACT)) is 1 (limit cycle method).
+26
*2
Output upper limit value (ULV) Upper limit (ULV) of the manipulated value
(MV)
+27
*2
Output lower limit value (LLV) Lower limit (LLV) of the manipulated value
(MV)
+28
*2
Wait time setting parameter from the end of
tunning cycle to the start of PID control
(K
W
)
-5 to 32717 [%]
Error code
(SD0)
Description
11A0H A value set for the sampling time (T
S
) is out of the range, T
S
 0.
11A1H A value set for the input filter constant () is out of the range,  < 0 or 100  .
11A2H A value the proportional gain (K
P
) is out of the range, K
P
< 0.
11A3H A value set for the integral time (T
I
) is out of the range, T
I
< 0.
11A4H A value set for the derivative gain (K
D
) is out of the range, K
D
< 0 or 201  K
D
.
11A5H A value set for the derivative time (T
D
) is out of the range, T
D
< 0.
11A6H A value set for the sampling time (T
S
) is less than the operation cycle of the programmable controller.
11A7H The process value variation (PV) overflowed.
11A8H Deviation (EV) overflowed.
11A9H The calculated integral value overflowed.
11AAH The derivative gain (K
D
) value overflowed.
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.
11B1H ■Step response method
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).
Operand: (s3)
Device Item Description Remarks