GE 90-30/20/Micro manual Parameters. Uses 40 %R words that cannot be shared

4

Parameters:

Parameter	Description
enable	When enabled through a contact, the PID function is performed.
SP	SP is the control loop or process set point. Set using PV Counts, the PID adjusts the
	output CV so that PV matches SP (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 block is in MANUAL mode. If the
	PID block is on manual off, the PID block is in automatic mode.
UP	If energized along with MAN, it adjusts the CV up by 1 CV per solution.*
DN	If energized along with MAN, it adjusts the CV down by 1 CV per solution.*
RefArray	Address is the location of the PID control block information (user and internal
Address	parameters). Uses 40 %R words that cannot be shared.
ok	The ok output is energized when the function is performed without error. It is off if
	error(s) exist.
CV	CV is the control variable output to the process, often a %AQ analog output.

*Incremented (UP parameter) or decremented (DN parameter) by one (1) per access of the PID function.

Valid Memory Types:

Parameter

flow

%I

%Q

%M

%T

%S

%G

%R

%AI

%AQ

const

none

enable

•

SP

•

•

•

•

•

•

•

•

•

PV

•

•

•

•

•

•

•

•

MAN

•

UP

•

DN

•

address

•

ok

•

•

CV

•

•

•

•

•

•

•

•

•Valid reference or place where power may flow through the function.

4-172 Series 90-30/20/Micro Programmable Controllers Reference Manual–September 1998 GFK-0467K