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

Chapter 7. PID Built-In Function Block

7.1 Operands of the PID Function

7.1.1

Operands for LD Version of PID Function Block

Parameter Description
Instance Variable name of the PID
Parameter Block array, which contains user-
(????)
configurable and internal parameters,
described in
Function
. Uses 40 words that cannot be
shared.
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 While Power Flow is received, the PID
function block is held in manual mode. If no
Power Flow is received the PID function
block is in Auto mode.
UP While Power Flow is received, the Manual
Command is increased by 1 each user
configured Sample Period.
DN While Power Flow is received, the Manual
Command is decreased by 1 each user
configured Sample Period.
CV The control variable output to the process.
Often a %AQ output.
344 PACSystems* RX7i, RX3i and RSTi-EP CPU Programmer's Reference Manual
Reference Array for the PID
Allowed Types Allowed Operands Optional
WORD R, L, P, W
and symbolic
INT, BOOL array All except S, SA, SB,
of length 16 or and SC
more, Constant
INT, BOOL array All except S, SA, SB,
of length 16 or and SC, and
more constant
Power Flow NA
Power Flow NA
Power Flow NA
INT, BOOL array All except %S and
of length 16 or constant
more
No
No
No
No
No
No
No
GFK-2950C