Input Parameter Cont_C - Siemens SIMATIC S7-1200 Function Manual

9.4.1.4

Input parameter CONT_C

Table 9- 13 Input parameter CONT_C
Parameters Data
type
COM_RST BOOL
MAN_ON BOOL
PVPER_ON BOOL
P_SEL BOOL
I_SEL BOOL
INT_HOLD BOOL
I_ITL_ON BOOL
D_SEL BOOL
CYCLE TIME
SP_INT REAL
PV_IN REAL
PV_PER WORD W#16#0000 The process value in I/O format is interconnected with the controller at the "Process
MAN REAL
GAIN REAL
TI TIME
TD TIME
TM_LAG TIME
DEADB_W REAL
PID control
Function Manual, 03/2017, A5E35300227-AC
Default Description
FALSE T he instruction has an initialization routine that is p rocessed when the "Restart"
input is set.
TRUE If the input "Enable manual mode" is set then the control loop is interrupted. A
manual value i s set as the manipulated value.
FALSE If the process value is to be read in from the I/Os, the PV_PER input must be inter-
connected with the I/Os and the "Enable process value I/Os" input must be set.
TRUE The PID actions can be switched on and off individually in the PID algorithm. P-
action is on when the "Enable P-action" input is set.
TRUE The PID actions can be switched on and off individually in the PID algorithm. I ac-
tion is on when the input " I-action on" is set.
FALSE The output of the integral action can be frozen. For this the input "I-action hold"
must be set.
FALSE The output of the integral action can be set at the I_ITLVAL input. For this the input
"Set I-action" must be set.
FALSE The PID actions can be switched on and off individually in the PID algorithm. D-
action is on when the i nput "Enable D-action" is set.
T#1s The time between block calls must be constant. The "Sampling time" input specifies
the t ime between block calls.
CYCLE >= 1ms
0.0 The input "Internal setpoint" is used to specify a setpoint.
Permissible are values from -100 to 100 % or a physical variable 1).
0.0 At the "Process value input" you can assign parameters to a commissioning value
or you can interconnect an external process value in floating-point format.
Permissible are values from -100 to 100 % or a physical variable 1).
value I/0" input.
0.0 The "Manual value" input is used to set a m anual value using the operator interface
f unctions.
Permissible are values from -100 to 100 % or a physical variable 2).
2.0 The "Proportional gain" input specifies controller amplification.
T#20s T he "Integration time" input determines the time r esponse of the integral action.
TI >= CYCLE
T#10s T he "Derivative action time" input determines the time r esponse of the derivative
action.
TD >= CYCLE
T#2s Time lag of the D-action
The algorithm of the D-action contains a delay for which parameters can be as-
signed at the input "Time lag of the D-action".
TM_LAG >= CYCLE/2
0.0 A dead band is applied to the system deviation. The "Dead band width" input de-
termines the size of the dead band.
DEADB_W >= 0.0 (%) or a physical variable 1)
Instructions
9.4 PID basic functions
453