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Specifications
Section
1-3
41
1-3-4
Outline of PID Block Specifications
This item mainly describes an outline of the PID block specifications.
In the Basic PID block (Block Model 011) and Advanced PID block (Block
Model 012), the functions are set to ON and OFF. For actual details on each
ITEM setting, see the descriptions for each block.
: supported,
: not
supported
Item
Description
Basic
PID
Advan-
ced PID
Number of points
1
Input Range
-15.00 to +115.00%
PV (Process
Variable) Input
Operation function
None (Calculation of square root, first-order lag, bias,
etc. is required by external blocks.)
Sampling cycle
According to the specified operation cycle of this block
(one of 0.1, 0.2. 0.5, 1, 2 seconds or 1 to 128 seconds)
PV error input
When the PV error contact turns ON, the Loop Control
Unit is forced to enter the Manual mode, and the MV
value active at that moment is held. At the same time,
the PV error is transferred to the CX-Process Monitor.
Number of points
1
Setting range
-15.00 to +115.00%
Remote/Local
switching
Possible
SP rate-of-change
limitter
Possible (0 to 115.00%/s)
PV tracking
Match the SP (Set Point) to the PV (Process Variable)
if the Loop Control Unit is in the Local and Manual
modes when PV tracking is set to ON.
SP (Set Point)
Bumpless
processing
between
primary/secondary
loops
When the self node is performing cascade control as
the secondary controller, processing is performed on
the MV of the primary controller to be input.
Deviation
PV compensation
Arithmetic operation (addition, subtraction, substitution)
is performed on the PV signals to be input to the PID
control section when the PV compensation input switch
is ON.
PID Control
Control method
Advanced PID (Various PID methods (proportional
priority type, PV differential priority type, deviation
differential type, etc.) can be selected according to the
settings of parameters
and
.)
Control action
Direct/reverse switchable
PID constant
1 set
Automatic setting (AT: auto-tuning) by the limit cycle
mode is possible.
Proportional band: 0.1 to 999.9% (0.1% increments)
Integral time: 0 to 9999 s. (1 second increments)
0: No accumulator
Integral stop can be indicated from external contacts.
Differential time: 0 to 9999 s. 0: No differentiation
Manual reset
-320.00 to 320.00 (0.01% increments)
Number of points
1 set
MV
(Manipulated
Variable)
Output range
-320.00 to +320.00%
Output refresh
cycle
According to the specified operation cycle of this block
(one of 0.1, 0.2. 0.5, 1, 2 seconds)
Auto/manual
switching
Possible (according to CX-Process Monitor, CX-
Process Tool or contact signal from Step Ladder
Program block/Contact Distributor block)
High/low MV limit
High limit: -320.00 to +320.00%, low limit: -320.00 to
+320.00%