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User Manual
GFK-1503F
Words
3 (Address + 2)
4,5
(Address + 3,
Address + 4)
6
(Address + 5)
PID Built-in Function Block
Parameter/Description
Sample Period
The shortest time, in 10 ms. increments,
between solutions of the PID algorithm. For
example, use a 10 for a 100ms. sample period.
Dead Band +
Dead Band –
Integral values defining the upper (+) and lower
(-) Dead Band limits. If no Dead Band is required,
these values must be 0. If the PID Error (SP - PV)
or (PV - SP) is above the (-) value and below the
(+) value, the PID calculations are solved with an
Error of 0. If non- zero, the (+) value must
greater than 0 and the (-) value less than 0 or the
PID block will not function.
Leave these at 0 until the PID loop gains are set
up or tuned. A Dead Band might be added to
avoid small CV output changes due to variations
in error.
PID_IND: Proportional Gain (Kp)
PID_ISA: Controller gain (Kc = Kp)
PID_IND: Change in the Control Variable in CV
Counts for a 100 PV Count change in the Error
term. Entered as an integer representing a fixed-
point decimal ratio with two decimal places.
Displayed as a ratio of percentages with two
decimal places.
For example, a Kp entered as 450 is displayed as
4.50 and results in a Kp * Error / 100 or 450 *
Error / 100 contribution to the PID Output.
PID_ISA: Same as PID_IND.
Kp is generally the first gain set when adjusting
a PID loop.
Chapter 14
Jan 2020
Low Bit
Range
Units
10 ms.
0 (every
sweep) to
65535
(10.9 Min)
At least
10ms.
PV Counts
Dead Band
+: 0 to
32767
(never
negative)
Dead Band
-: -32768 to
0 (never
positive)
0.01
0 to
CV%/PV%
327.67%
%CV / %PV
252
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