Siemens SIMATIC Manual page 93

Internal Parameters
Addr Parameter Decl
32.0 PV_FAC INPUT
36.0 PV_OFFS INPUT
40.0 DEADB_W INPUT
44.4 PFAC_SP INPUT
48.0 GAIN INPUT
52.0 TI INPUT
56.0 MTR_TM INPUT
60.0 PULSE_TM INPUT
64.0 BREAK_TM INPUT
PID Temperature Control
A5E00125039-02
Data Range of
Type values
REAL
REAL Dependent
on the
sensors
used
≥ 0.0
REAL
REAL 0.0 to 1.0
REAL %/phys.
unit
≥ 0.0 s
REAL
≥ CYCLE
REAL
≥ 0.0 s
REAL
≥ 0.0 s
REAL
Initial Description
Value
1.0 PROCESS VARIABLE FACTOR
The "process variable factor" input is
multiplied by the "process value".
The input is used to adapt the
process variable range.
0.0 PROCESS VARIABLE OFFSET
The "process variable offset" input is
added to the process variable. The
input is used to adapt the process
variable range.
0.0 DEAD BAND WIDTH
The error passes through a dead
band. The "dead band width" input
decides the size of the dead band.
PROPORTIONAL FACTOR FOR
1.0
SETPOINT CHANGES [0..1 ]
PFAC_SP specifies the effective P
action when there is a setpoint
change.
This is set between 0 and 1.
•
1: P action has full effect if the
setpoint changes.
•
0: P action has no effect if the
setpoint changes.
PROPORTIONAL GAIN
2.0
The "proportional gain" input
specifies the controller gain. The
direction of control can be reversed
by giving GAIN a negative sign.
RESET TIME [s]
40.0 s
The "reset time" input (integral time)
decides the integral action response.
MOTOR ACTUATING TIME
30 s
The run time of the valve from limit
stop to limit stop is entered in the
"motor actuating time" parameter.
MINIMUM PULSE TIME [s]
0.0 s
A minimum pulse time can be set
with the "minimum pulse time"
parameter.
MINIMUM BREAK TIME [s]
0.0 s
A minimum break time can be set
with the "minimum break time"
parameter.
Appendix
A-15