Siemens SIMATIC Manual page 81

Addr Parameter Decl.
12.0 SELECT INPUT
14.0 PV OUTPUT REAL
18.0 LMN OUTPUT REAL
22.0 LMN_PER OUTPUT INT
24.0 QPULSE OUTPUT BOOL
24.1 QLMN_ OUTPUT BOOL
HLM
PID Temperature Control
A5E00125039-02
Data Range of Initial
Type values Value
INT 0 to 3 0
Depen- 0.0
dent on
the
sensors
used
0.0
0
FALSE
FALSE
Description
SELECTION OF CALL PID AND
PULSE GENERATOR
If the pulse generator is activated,
there are several ways of calling the
PID algorithm and pulse generator:
•
SELECT =0: The controller is
called in a fast cyclic interrupt
level and the PID algorithm and
pulse generator are processed.
•
SELECT =1: The controller is
called in OB1 and only the PID
algorithm is processed.
•
SELECT =2: The controller is
called in a fast cyclic interrupt
level and only the pulse generator
is processed.
•
SELECT =3: The controller is
called in a slow cyclic interrupt
level only the PID algorithm is
processed.
PROCESS VARIABLE
The effective process variable is
output at the "Process Variable"
output.
MANIPULATED VARIABLE
The effective value of the
manipulated variable is output in
floating-point format at the
"Manipulated Variable" output.
MANIPULATED VARIABLE
PERIPHERY
The value of the manipulated variable
in the peripheral format is connected
to the controller at the "Manipulated
Variable Periphery" output.
OUTPUT PULSE SIGNAL
The value of the manipulated variable
is output pulse duration modulated at
the QPULSE output.
HIGH LIMIT OF MANIPULATED
VARIABLE REACHED
The value of the manipulated variable
is always limited to an upper and
lower limit. The QLMN_HLM output
indicates when the upper limit is
exceeded.
Appendix
A-3