User Guide

Command Syntax
Siemens Building Technologies, Inc. 3-65
LOCAL (Local variable)
Unitary pre-APOGEE APOGEE BACnet
 
Syntax
LOCAL(pt1,... ,pt16)
pt1
through
pt16
Names of virtual points created for the program.
Use
Creates virtual points for the program.
• The program can reference these points as $pt1 through $pt16.
• Other programs can reference these points by referencing the
program name, followed by the system delimiter (:), followed by
the local point name.
Example 1
The following is an example of commanding a local point contained
within a program:
100 LOCAL(FANPT)
200 ON($FANPT)
Example 2
The following is an example of a program using the value of a local
point in a different program (where PROG1 is the program name):
300 IF(“PROG1:FANPT”.EQ.ON)THEN ...
APOGEE PPCL User’s Manual
3-66 Siemens Building Technologies, Inc.
LOOP (Loop control)
Unitary pre-APOGEE APOGEE BACnet
   
Syntax
LOOP(type,pv,cv,sp,pg,ig,dg,st,bias,lo,hi,0)
type Designates the type of control action.
• Valid values are 0 and 128.
0 = direct acting.
128 = reverse acting.
pv Point name of the process variable which is being controlled
or regulated.
• This parameter is usually an LAI point, but it can be
an LAO point, which represents a temperature, flow
rate, air velocity, etc.
cv Point name of the loop output (control variable).
• This parameter is usually an LAO point that
represents an actuator signal such as pressure,
current, or voltage.
• This value can be entered as a local variable.
sp Setpoint for the loop against which the process variable is
compared. The value of the setpoint should represent the
same engineering units as the process variable.
• This parameter can be entered as a point name or a
decimal number.
• This value can be entered as a local variable.
pg Proportional gain determines the part of a PID control action
that is directly proportional to the error between the setpoint
(sp) and the process variable (pv).
• This parameter can be entered as a point name, local
variable, integer, or decimal.
Proportional gain is calculated using the following formula:
Full range of controlled device
pg =
Throttling range to change the output
device from full open to full close.
× 1000