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User Manual
GFK-1503F
Words
19
(Address +18)
20
(Address +19)
21, 22
(Address + 20.
Address + 21)
23 (Address
+22)
24 – 26
(Address +
23 – Address
+ 25)
27 (Address +
26)
28, 29 (Address
+
27, Address
+ 28)
30 (Address +
29)
PID Built-in Function Block
Parameter/Description
Output
Signed word value representing the output of
the function block before the optional inversion.
If the output polarity bit in the Config Word is set
to 0, this value equals the CV output. If the
output polarity bit is set to 1, this value equals
the negative of the CV output.
Derivative Term Storage
Used internally for storage of intermediate
values. Do not write to this location.
Integral Term Storage
Used internally for storage of intermediate
values. Do not write to these locations.
Slew Term Storage
Used internally for storage of intermediate
values. Do not write to this location.
Previous Solution Time
Internal storage of (time of last PID solution.
Normally do not write to these locations. Some
special circumstances may justify writing to
these locations.
Note: If you call the PID block in Automatic
mode after a long delay, you might want to use
SVC_REQ #16 or SVC_REQ #51 to load the
current CPU elapsed time clock into Word 24 to
update the last PID solution time to avoid a step
change of the integral term.
Integral Remainder Storage
Holds remainder from integral term scaling.
SP, PV Lower Range
SP, PV Upper Range
Optional integer values in PV Counts that define
high and low display values for SP and PV. (Word
29 must be greater than word 28.)
Reserved
Word 30 is reserved. Do not use this location.
Chapter 14
Jan 2020
Low Bit
Range
Units
Set and
Non-
maintained
configurable
by the CPU.
.
Set and
Non-
maintained
configurable
by the CPU.
.
Set and
Non-
maintained
configurable
by the CPU.
.
PV Counts
-32768 to
32767
N/A
Non-
configurable
.
259
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