Words
Parameter/Description
Low Bit
Units
Range
19
(A 18)
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.
Set and
maintained by
the CPU.
Non-configurable.
20
(A 19)
Derivative Term Storage
Used internally for storage of intermediate values. Do not
write to this location.
21, 22
(A 20.
A 21)
Integral Term Storage
Used internally for storage of intermediate values. Do not
write to these locations.
23
(A22)
Slew Term Storage
Used internally for storage of intermediate values. Do not
write to this location.
24 – 26
(A 23 –
A 25)
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.
Set and
maintained by
the CPU.
Non-configurable.
27
(A 26)
Integral Remainder Storage
Holds remainder from integral term scaling.
Set and
maintained by
the CPU.
Non-configurable.
28, 29
(A 27,
A 28)
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.)
PV Counts
-32768 to 32767
30
(A 29)
Reserved
Word 30 is reserved. Do not use this location.
N/A
Non-configurable.
31, 32
(A 30,
A 31)
Previous Derivative Term Storage
Used in calculations for derivative filter. Do not write to these
locations.
Set and
maintained by
the CPU.
Non-configurable.
33 –40
(A 32 –
A 39)
Reserved
Words 32-39 are reserved. Do not use these references.
N/A
Non-configurable
PID Built-in Function Block
GFK-1503E User Manual 281
For public disclosure
Summary of Contents for VersaMax PLC
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