Siemens PCS 7 manual Configuration of MPC with Slave Controller, Starting Point, Connection in CFC

Configuration of MPC with Slave Controller

4Configuration of MPC with Slave Controller

4.1Starting Point

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

Copyright  Siemens AG 2010 All rights reserved

			g11
CV1			g12
CV2	ModPreCon	MV1
	.	MV2
			g21
			CV2
			g22

4.2Connection in CFC

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.

MPC Level	15
V 1.0, Beitrags-ID: 42200753