Academia.eduAcademia.edu

Figure 4 – uploaded by Ferhat Tamssaouet

See full PDFdownloadDownload figure
Figure 5. Elementary delays of the response time.

Figure 5 Elementary delays of the response time.

Related Figures (11)

Algorithm 1 Calculation of the upper generalised bound of a sequence of events
Algorithm 1 Calculation of the upper generalised bound of a sequence of events
Figure 2. General view of the behaviour of client/server NCS. between the servers, ie. the providers of a service, and the clients, i.e. the service requesters. Generally, PLCs are considered in NCS as clients and Remote I/O Modules (RIOM) as servers. The components of the NCS commu- nicate over a computer network. Figure 2 shows an NCS working under client/server protocol. The representation at the data exchange zones in Figure 2 (memory and FIFO stack) is such that the arrows arriving above or below the exchange zone correspond to the event triggering the transfer while the arrows connected to the right or left sides correspond to the actual transfer of data. 3.1.1. Remote I/O modules (RIOM) Are microprocessor-controlled electronic devices that interface the external environment to the distributed Control system by transmitting telemetry data from sen- sors to controllers and by using information message
Figure 2. General view of the behaviour of client/server NCS. between the servers, ie. the providers of a service, and the clients, i.e. the service requesters. Generally, PLCs are considered in NCS as clients and Remote I/O Modules (RIOM) as servers. The components of the NCS commu- nicate over a computer network. Figure 2 shows an NCS working under client/server protocol. The representation at the data exchange zones in Figure 2 (memory and FIFO stack) is such that the arrows arriving above or below the exchange zone correspond to the event triggering the transfer while the arrows connected to the right or left sides correspond to the actual transfer of data. 3.1.1. Remote I/O modules (RIOM) Are microprocessor-controlled electronic devices that interface the external environment to the distributed Control system by transmitting telemetry data from sen- sors to controllers and by using information message
Figure 3. TAGs-based model of the behaviour of components of NCS.
Figure 3. TAGs-based model of the behaviour of components of NCS.
[Tcom, Tcom];END_COM;C2 Figure 4. NCS modelling using TAGs.
[Tcom, Tcom];END_COM;C2 Figure 4. NCS modelling using TAGs.
By applying these modifications, the model represent- ing the scanning has the number of states equals to:
By applying these modifications, the model represent- ing the scanning has the number of states equals to:
where the different parameters are defined as: The meaning of the parameters remains the same as for an NCS with a single RIOM. r is calculated in the same way because the periods of the COM or the CPU do not change.
where the different parameters are defined as: The meaning of the parameters remains the same as for an NCS with a single RIOM. r is calculated in the same way because the periods of the COM or the CPU do not change.
Figure 7. Example of an NCS.
Figure 7. Example of an NCS.
Figure 8. Relationship between maximum response time and scanning period.
Figure 8. Relationship between maximum response time and scanning period.
Figure 9. Effect of loading R1 on the maximal response time.
Figure 9. Effect of loading R1 on the maximal response time.
Related topics:
EngineeringComputer ScienceNetworked Control System (NCS)Discrete Events Systems
580 California St., Suite 400
San Francisco, CA, 94104
© 2025 Academia. All rights reserved