Operands For Fbd Version Of Pid Function Block - GE PACSystems RX7i Cpu Programmer's Reference Manual

7.1.2

Operands for FBD Version of PID Function Block

Parameter Description
Control Instance Variable name of the PID
Structure Parameter Block array, which contains
Variable user-configurable and internal
parameters, described in
Array for the PID Function
words that cannot be shared.
Function Calculated by the FBD editor. Can be
block solve changed by the user.
order – FBD
version
SP The control loop or process set point.
Set using process variable counts, the
PID function adjusts the output
control variable so that the process
variable matches the set point (zero
error).
PV Process Variable input from the
process being controlled. Often a %AI
input.
MAN When energized to 1 (through a
contact), the PID function block is in
manual mode. If this input is 0, the
PID block is in automatic mode.
UP If energized along with MAN,
increases the control variable by 1 CV
count per solution of the PID function
block.
DN If energized along with MAN,
decreases the control variable by 1
CV count per solution of the PID
function block.
CV The control variable output to the
process. Often a %AQ output.
GFK-2950C
Allowed Types
WORD
Reference
. Uses 40
NA
INT, BOOL array of
length 16 or more,
Constant
INT, BOOL array of
length 16 or more
BOOL, Power Flow
BOOL, Power Flow
BOOL, Power Flow
INT, BOOL array of
length 16 or more
February 2018
Chapter 7. PID Built-In Function Block
Allowed Operands
R, L, P, W
and symbolic
NA
All except S, SA, SB,
and SC
All except S, SA, SB,
SC and constant
All
All
All
All except %S and
constant
Optional
No
No
No
No
No
No
No
No
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