Mitsubishi Electric FX3G User Manual page 509

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