
Chapter 5. FUNCTIONS
5-4 Controllers and Programmers
Setup data
C21
allows the user to select the controller function or the programmer function.
●
Controller
PID controller computations can be performed using PV, SP and PID set values and the
result of the manipulated variable is output via an analog output.
ON-OFF control can be used instead of PID control.
In the MANUAL mode, manipulated variable levels can be controlled by keys available
in the basic display status.
●
Programmer
PID control computations are not performed and 4 to 20mA output of scaled SP signals
are output.
In the MANUAL mode, SP levels can be controlled by keys available in the basic dis-
play status.
NOTE
The constant value control mode cannot be invoked when the programmer function is
used.
DCP551
Controller
5-29