70
The function uses the following parameters:
•
Output value
The Output value is set by the PID automatically calculating the
single percentages of the proportional and integral actions. In this
mode, at the switching of manual function to automatic, the output
value of the PID will take on the value set by manual and will
initiate the regulation.
The function thus should be called only during the manual
regulation phase, in order to maintain alignment of the output of
the PID with that of manual. The function will automatically zero
the derived action. The use of this function with the process
outside of the proportional band sets the integral action to zero.
7.22 GENSET functions
The function GENSET automatically generates a setpoint variable
rising or falling, with the possibility to set a ramp of acceleration or
deceleration. The function GENSET operates on a series of
variables in contiguous double words, starting from the location
indicated as a parameter to the function.
The following table indicates how the data are organized in the
memory area used by the function starting from the address of the
specified location:
Address
area VD
Contents
+0
State of the GENSET function
0
Stop or end of movement
1
Initialization function
2
Ramp of acceleration
3
Movement at constant velocity
4
Ramp of deceleration
+2
Initial setpoint / setpoint calculated by the function
GENSET (counts)
+4
Final setpoint (counts)
+6
Velocity of movement (counts*1000 / time unit)
