Siemens PCS 7 Manual De Usuario

Configuration of MPC with Slave Controller

 

MPC Level 

V 1.0, Beitrags-ID: 42200753 

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The starting point is the standard connection of the MPC with its actuators. The 

structure of the following example corresponds to the control of product quality 

(CV1) and level (CV2) in a reactor as mentioned in section 2.3.4. However, this ex-

ample is not a realistic simulation of a real reactor. 
 

Figure 4-1 Original signal flow chart of an MPC with 2x2 process, where the main transfer 

function g22 shows an integral action 

g22

g21

g12

g11

ModPreCon

.

MV1

MV2

CV1

CV2

CV2

g22

g21

g12

g11

ModPreCon

.

MV1

MV2

CV1

CV2

CV2

 

 

Now, a stabilizing PID controller is inserted for the integral sub process. In principal 

this control structure is a cascade consisting of an MPC as master controller and 

the stabilizing proportional-only controller as slave. The external set point SP_EXT 

of the slave controller is linked to the corresponding manipulated variable of the 

MPC. 
The equality of the controlled variable of the master controller (i.e. the correspond-

ing MPC control channel) and the controlled variable of the slave controller is the 

only special feature in the present case.