ControlMaster CM30, CM50 and CMF310
Universal process controllers,
1
/
4
,
1
/
2
DIN and fieldmount
8 Templates and Functionality
92
IM/CM/ED–EN Rev. X
8.3 Extended Templates
8.3.1 Feedforward / Feedforward with Remote Setpoints
This template allows for an extra (disturbance) variable which is weighted by the feedforward gain and bias
values to be then added to the controller output value. When in manual mode the PID output tracks the
difference between the control output value and the feedforward signal to ensure bumpless transfer back in
to auto mode.
8.3.2 Cascade / Cascade with Remote Setpoints
This template connects 2 PID loops together in order to enhance the control of a Master variable (loop) by
manipulation of a slave loop. The first (master) controller provides the set point for the second (slave)
Controller. The 2 controllers are linked internally.
The Master output can be weighted using the Cascade ratio and bias values to create the Slave setpoint
value. When the auto/manual mode is changed via the front panel or by a digital signal both the master and
slave controllers change mode. In manual mode the slave setpoint can be adjusted by the user and the
value is tracked by the master controller to ensure bumpless transfer back into auto mode.
Notes.
When selecting a Cascade application template, Logic Equation 1 is pre-configured as part of the
Cascade Logic. Changing this equation prevents correct operation of the Cascade application template.
AIN 1
AIN 4
AIN 2*
Local
Set Point
x Ratio
+ Bias
Loop 1 PID Control
PV
L/R
SP
Manual
Output
Time Prop Output
Motorized Valve
Split Output
Output Type
Analog Output
PID
O/P
A/M
DV
OP
AO1
RLY1
RLY2
RLY1
OP2
OP1
AIN 3
1
Feedforward with Remote Setpoint Template only
RSP
*Source can be changed in
Control / FeedForward
configuration –
PID
x FF Gain
1
MVFB