Siemens SIMATIC Manual page 15

2 Continuous Temperature Controller FB 58
"TCONT_CP"
2.1 Controller Section
2.1.1 Forming the Error
The schematic below is a block diagram illustrating how the error is formed:
SP_INT
PV_IN
CRP_IN
*0,1
*0,01
PV_PER
PER_MODE
Parameter assignment user interface
FB call interface
Parameter assignment u ser interface, FB call interface
Setpoint Branch
The setpoint is entered at input SP_INT in floating-point format as a physical value
or percentage. The setpoint and process value used to form the error must have
the same unit.
Process Value Options (PVPER_ON)
Depending on PVPER_ON, the process value can be acquired in the peripheral
(I/O) or floating-point format.
PVPER_ON
TRUE
FALSE
PID Temperature Control
A5E00125039-02
PV_NORM
0
C
0
C
%
PV_FAC,
PV_OFFS
Process Value Input
The process value is read in via the analog peripheral I/Os (PIW xxx)
at input PV_PER.
The process value is acquired in floating-point format at input PV_IN.
PVPER_ON
DEADBAND
+
0
1
DEADB_W
PV
ER
2-1