Words
Parameter/Description
Low Bit
Units
Range
8
(A 7)
PID_IND: Integral Rate (Ki)
PID_ISA: Integral Rate (1/Ti = Ki)
PID_IND: Rate of change in the control variable in CV Counts
per second when the Error is a constant 1 PV Count. Entered
as an integer representing a fixed-point decimal rate with
three decimal places. The least significant digit represents
0.001 counts per second, or 1 count per 0.001 second.
Displayed as Repeats/Sec with three decimal places.
For example, Ki entered as 1400 is displayed as 1.400
Repeats/Sec and results in a Ki * Error * dt or 1400 * 20 *
50/1000 = 1,400 contribution to PID Output for an Error of 20
PV Counts and a 50 ms. CPU sweep time (Sample Period of
0).
PID_ISA: The ISA Integral Time in seconds, Ti, must be
inverted and entered, as integral rate, as described for PID_
IND. Total integral contribution to PID Output is
Kc * Ki * Error * dt.
Ki is usually the second gain set after Kp.
Repeats/
0.001 Sec.
0 to 32.767
repeats/sec
9
(A 8)
CV Bias/Output Offset
Number of CV Counts added to the PID Output before the
rate and amplitude clamps. It can be used to set non-zero CV
values when only Kp Proportional gains are used, or for
feed-forward control of this PID loop output from another
control loop.
CV Counts
-32768 to 32767
(add to PID output)
10, 11
(A 9.
A 10)
CV Upper Clamp
CV Lower Clamp
Number of CV Counts that define the highest and lowest
value that CV is allowed to take. These values are required.
The Upper Clamp must have a more positive value than the
Lower Clamp, or the PID block will not work. These are
usually used to define limits based on physical limits for a CV
output. They are also used to scale the Bar Graph display for
CV. The PID block has anti-reset-windup, controlled by bit 4 of
the Config Word, to modify the integral term value when a CV
clamp is reached.
CV Counts
-32768 to 32767
(Word 10 must be
greater than word 11.)
PID Built-in Function Block
GFK-1503E User Manual 277
For public disclosure
Summary of Contents for VersaMax PLC
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