Technical data

Table Of Contents
SFBs for Integrated Control
System Software for S7-300/400 System and Standard Functions - Volume 2/2
A5E00739858-01
27-5
Input Parameters
The following table contains the description of the input parameters for
SFB 41/FB 41 "CONT_C."
Parameter Data Type Range of Values Default Description
COM_RST BOOL FALSE COMPLETE RESTART
The block has an initialization routine that is
processed when the input COM_RST is set.
MAN_ON BOOL TRUE MANUAL VALUE ON
If the input "manual value on" is set, the
control loop is interrupted. A manual value
is set as the manipulated value.
PVPER_ON BOOL FALSE PROCESS VARIABLE PERIPHERAL ON
If the process variable is read from the I/Os,
the input PV_PER must be connected to
the I/Os and the input "process variable
peripheral on" must be set.
P_SEL BOOL TRUE PROPORTIONAL ACTION ON
The PID actions can be activated or
deactivated individually in the PID
algorithm. The P action is on when the input
"proportional action on" is set.
I_SEL BOOL TRUE INTEGRAL ACTION ON
The PID actions can be activated or
deactivated individually in the PID
algorithm. The I action is on when the input
"integral action on" is set.
INT_HOLD BOOL FALSE INTEGRAL ACTION HOLD
The output of the integrator can be "frozen"
by setting the input "integral action hold."
I_ITL_ON BOOL FALSE INITIALIZATION OF THE INTEGRAL
ACTION ON
The output of the integrator can be
connected to the input I_ITL_VAL by setting
the input "initialization of the integral action
on."
D_SEL BOOL FALSE DERIVATIVE ACTION ON
The PID actions can be activated or
deactivated individually in the PID
algorithm. The D action is on when the
input "derivative action on" is set.
CYCLE TIME >= 1 ms T#1s SAMPLING TIME
The time between the block calls must be
constant. The "sampling time" input
specifies the time between block calls.
SP_INT REAL -100.0 to +100.0
(%) or phys.
value 1)
0.0 INTERNAL SETPOINT
The "internal setpoint" input is used to
specify a setpoint.
PV_IN REAL
-100.0 to +100.0
(%) or phys. Value
1)
0.0 PROCESS VARIABLE IN
An initialization value can be set at the
"process variable in" input or an external
process variable in floating point format can
be connected.