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PLC User's Manual - Analog Control Edition
PID Instruction (FNC 88)
M-23
5 Example of Practical Programs (for Step Response Method)
5.1 Example: System and operation
K
FX
3U
-4AD-PNK
-ADP
L
FX
3U
-4AD-TC
-ADP
M
PID Instruction
(FNC 88)
5. Example of Practical Programs (for Step Response Method)
The following is an example of a program for the operation application system shown below.
5.1 Example: System and operation
System configuration
Setting contents
1. Operation of the electric heater
1) During PID control
2) During auto-tuning: When the output is 90% of the maximum output
Item
During auto-
tuning
During PID
control
Target value
500 (+50°C) 500 (+50°C)
Parameters
Sampling time (TS)
3000 ms 500 ms
Input filter (α)+2
70% 70%
Differential gain (K
D)+5
0% 0%
Output value upper limit +22
2000
(2 seconds)
2000
Output value lower limit +23
00
Operation direction
(ACT)
Input variation alarm bit 1 of +1
Not provided Not provided
Output variation alarm bit 2 of +1
Not provided Not provided
Output value upper/lower limit setting bit 5 of +1
Provided Provided
Output value
1800
According to
operation
Temperature
chamber
Shielded compensating
conductor
Temperature sensor
(Thermocouple)
Error indication
X010: Auto-tuning command
X011: PID control command
Electric heater
FX
2N
-16EYT-
ESS/UL
*1
FX
2N
-4AD-
TC
FX
3U
-32MR/
ES
Y21Y20COM
X11X10
ch2
*1: Since turning on/off is frequently carried out, be sure to use the
transistor outputs.
S
1
S
3
S
3
S
3
S
3
S
3
S
3
S
3
S
3
D
2 sec (2000 ms)
<cycle>
D502
×
1 ms <ON duration>
OFF
2 sec (2000 ms)
ON ONON
ON ON
2 sec (2000 ms)
2 sec (2000 ms) 2 sec (2000 ms) 2 sec (2000 ms)
1.8 sec (1800 ms) 1.8 sec (1800 ms) 1.8 sec (1800 ms)