ControlMaster CM30 and CM50
Universal process controllers,
1
/4 and
1
/2 DIN 8 Templates and Functionality
68 IM/CM/ED–EN Rev. B
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 boas 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.
AIN 1
AIN 3
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
LSPT1
LSPT2
LSPT3
LSPT4
1 Feedforward with Remote Setpoint Template only
1
RSP
*Source can be changed in Control / FeedForward configuration – see Section 7.4, page 36
PID
x FF Gain
AIN 1
AIN 2
AIN 3
LSPT1
LSPT2
LSPT3
LSPT4
PV 1
Local
Set Point
x Ratio
+ Bias
L/R
(Slave)
Loop 2
PID
Control
PID
O/P
A/M
Manual
Output
Local
Set Point
x Ratio
+ Bias
Analog
Output
AO1
OP
Output Type
SPV
SSP
Motorized
Valve
Split
Output
RLY1
RLY2
RLY1
OP2
OP1
1 Cascade with Remote Setpoint Only
1
Time Prop
Output
(Master)
Loop 1
PID
Control
PID
O/P
MPV
MSP
RSP
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