The variable in the controlled subsystem,which is calculated for the purposes of and is supplied via the measuring device of the . It is the output variable of the system and, together with the reference variable is the input variable of the controller (Figure R 16).
![a9743e297b92897c95a28c6ec241ed708f4364a0 0001_regelgroesse.gif](/fileadmin/smc/files/a9743e297b92897c95a28c6ec241ed708f4364a0.gif)
Figure R 16: Designations on the control circuit