Final EMCS block diagram

Based on the preliminary EMCS block diagram, the final EMCS block diagram documents the detailed wiring of the automation equipment and thus represents the basis for the creation of the wiring documentation. To provide a better understanding, reference is again made to the structure of an automation system, which now poses the task of interconnecting the components process control console, switchroom and field by means of wiring. The basis of this wiring are the respective wiring harnesses and the corresponding terminal distributors. Picture 1 illustrates the structure of the wiring paths and the assembly points of these terminal distributors defined in the container units of process control console, switchroom and as such in the terminal boxes at field level. This illustrates that the terminal distributors are the major support points for the wiring paths, since they accommodate the incoming cables and route them via corresponding wiring blocks to the assembly levels of the control cabinets or other container units.

Picture 1: Structure of wiring path


Picture 2 provides an initial introduction to the principle designation of a terminal distributor.

Picture 2: Basic designation of a terminal distributor


It should be noted generally that the terminal distributor designation always starts with the letter X, and completed by an ordinal number and
a consecutive number. Here, the hardware design of the terminal distributors is also of interest.

Picture 3 provides a closer introduction of this design. In the sense of a general evaluation, it is always important to ask where a line (cable) is coming from (from which terminal distributor) and where it is to lead to (to which terminal distributor / assembly area).

Picture 3: Design of a terminal distributor



For instance, the main wiring paths are also clearly defined in Picture 1, and can be used as a general orientation for any automation system. On the assumption that the respective sensors and actuators are connected to the terminal boxes at field level, the following wiring paths can be defined in sequence:

Path 1: From terminal box-field level to terminal distributor-switchroom, e.g.: X300.01 ⇒ X200.01;
Path 2: From terminal strip-switchroom to assembly area switchroom racks, e.g.: X200.01 ⇒ Level A/Area 1;
Path 3: From assembly area switchroom racks via terminal distributor switchroom to terminal distributor process control console, e.g.: Level A/Area 1 ⇒ X200.02 ⇒ X100.01;
Path 4: From terminal distributor-process control console to PLC, e.g.: X100.01 ⇒ P-I/O card of PLC (DE 1);
Path 5: From PLC to terminal distributor-process control console, e.g.: P-I/O card of PLC (DA 11) ⇒ X100.01;
Path 6: Terminal distributor-process control console to terminal distributorswitchroom, e.g.: X100.01 ⇒ X200.01;
Path 7: Terminal distributor-switchroom to assembly area-switchroom racks, e.g.: X200.01 ⇒ Level A/Area 2;
Path 8: Assembly area-switchroom racks via terminal distributor switchroom to terminal box field level, e.g.: Level A/Area 2 ⇒ X200.02 ⇒ X300.01;

The wiring lists are then set out in accordance with these wiring paths and, as such, the connections documented in the final EMCS block diagram of the automation equipment involved in the configuration of the EMCS points, are put into an easily manageable form for the process control engineer.

Picture 4: Final EMCS block diagram – Filling level closed control loop (LIC 30) (Section 1 and 2)


Picture 4 also uses the example of the filling level control (LIC30 small-scale experimental modules) to introduce the final EMCS block diagram and to give a partial representation of a wiring list. The wiring list is partially represented in the table shown on Picture 5, and set out in accordance with the configuration already described.

Picture 5: Wiring list (excerpt A) using the example of the filling level closed control loop (LIC30/Section 2)