FX
3G
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
PID Instruction (FNC 88)
M-7
3 Parameter
3.1 Parameter List: (S3) to (S3) + 28
K
FX
3U
-4AD-PNK
-ADP
L
FX
3U
-4AD-TC
-ADP
M
PID Instruction
(FNC 88)
3. Parameter
This chapter describes various parameters of PID instruction.
3.1 Parameter List: (S3) to (S3) + 28
Set item Setting Remarks Reference
Sampling time (TS) 1 to 32767 (ms) It cannot be shorter than operation
cycle of the PLC.
Subsection
3.2.1
+1 Operation
setting (ACT)
bit0 0: Forward operation
1: Backward operation Operation direction
Subsection
3.2.2
bit1 0: Input variation alarm is invalid.
1: Input variation alarm is valid.
bit2 0: Output variation alarm is invalid.
1: Output variation alarm is valid.
Do not set to ON bit 2 and bit 5 at
same time.
bit3 Not available
bit4 0: Auto-tuning is not executed.
1: Auto-tuning is executed.
bit5
0: Upper and lower limits of output
value are not valid.
1: Upper and lower limits of output
value are valid.
Do not set to ON bit 2 and bit 5 at
same time.
bit6 0: Step response method
1: Limit cycle method Select auto-tuning mode.
bit7 to bit15 Not available
+2 Input filter constant (α) 0 to 99 (%) When "0" is set, input filter is not
provided.
Subsection
3.2.3
+3 Proportional gain (KP) 1 to 32767 (%) Subsection
3.2.4
+4 Integral time (TI) 0 to 32767 (× 100 ms) When "0" is set, it is handled as "∞"
(no integration).
Subsection
3.2.5
+5 Differential gain (KD) 0 to 100 (%) When "0" is set, differential gain is
not provided.
Subsection
3.2.6
+6 Differential time (TD) 0 to 32767 (× 10 ms) When "0" is set, differential is not
executed.
Subsection
3.2.7
+7
:
+19
These devices are occupied for internal processing of PID operation. Do not change data. ⎯
S
3
S
3
S
3
S
3
S
3
S
3
S
3
S
3
S
3
S
3
S
3
S
3
S
3
S
3
S
3
S
3
S
3
S
3