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PLC User's Manual - Analog Control Edition
PID Instruction (FNC 88)
M-11
3 Parameter
3.2 Details of Parameters
K
FX
3U
-4AD-PNK
-ADP
L
FX
3U
-4AD-TC
-ADP
M
PID Instruction
(FNC 88)
2. Alarm setting (for input variation and output variation): +1, bit 1 and bit 2
Setting range: OFF, ON
The input variation and output variation can be checked arbitrarily.
These parameters can be set in +24.
→ For the operation of upper/lower limit alarm output for the input and output values,
refer to Subsection 3.2.8.
Input variation: +1, bit 1
When using the input variation alarm, it is necessary to set to ON the following bits and set the values to be
checked.
Output variation: +1, bit 2
When using the output variation alarm, it is necessary to set the following bits to ON and set the values to be
checked.
Variation means (Previous value) - (Current value)
3. Upper and lower limits for output value: +1, bit 5
Setting range: OFF = Setting is not provided., ON = Setting is provided.
The upper limit and lower limit of the output value work as shown in the graph below.
The upper limit and lower limit of the output value can moderate the increase of the integral item in the PID
control.
When using the upper limit and lower limit of the output value, make sure to set +1, bit 2 is set to OFF.
Set item Setting (setting range)
Operation setting
(ACT)
+1
bit1 Input variation alarm
ON: Used
OFF: Not used
Input variation
alarm set value
+20
Input variation (incremental) alarm set value 0 to 32767
+21
Input variation (decremental) alarm set value 0 to 32767
Set item Setting (setting range)
Operation setting
(ACT)
+1
bit2 Output variation alarm
ON: Used
OFF: Not used
bit5 Output value upper/lower limit setting Make sure to set it to OFF
Output variation
alarm set value
+22
Output variation (incremental) alarm set value 0 to 32767
+23
Output variation (decremental) alarm set value 0 to 32767
Set item Setting (setting range)
Operation setting
(ACT)
+1(ACT)
bit2 Output variation alarm Make sure to set it to OFF
bit5 Output value upper/lower limit setting
ON: Used
OFF: Not used
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
S
3
S
3
S
3
Output value
upper limit
Output value
lower limit
Time
S
3
+22
Output value
S
3
+23
These values
are not output.
These values
are not output.
When the upper limit and lower
limit of output value are set
When the upper limit and lower
limit of output value are not set