the authors, an implementation of a virtual factory communication system using the MMS standard and its CS part has not been reported on yet in the technical literature.
In this article, we describe the implementation of a virtual factory communication system using the MMS and the MMS-CS standards. In addition, we discuss here the implementation of an MMS internet monitoring system (MIMS) for on-line monitoring of the developed virtual factory communication system.
This article is organized as follows. In Section 2, the design of the MMS communication on top of TCP/IP is described. The developed virtual factory communication system is presented in Section 3. In Section 4, MIMS, the monitoring program of virtual factory, is introduced. Finally, summary and conclusions are presented in Section 5.
Two types of protocol structures for the MMS communication on top of TCP/IP, referred to here as ”MOTIP,” have been studied . One method, which is based on Requests on Comments(RFC) 1006, uses the open systems interconnection (OSI) 7 layer model . The other method is based on N578 that defines the direct mapping relation between the M-services and the TCP functions . In particular, we chose to use the N578 method in the implemented system because its simplicity. The di erences between the structures of a Full-Map, Mini-Map, and MOTIP are presented on Fig. 1. In the case of Mini-MAP, IEEE 802.4 token-bus network is used instead of the Ethernet (IEEE 802.3) subnetwork. By Fig. 1, Full-Map structure has similar scheme to MOTIP based on the RFC 1006 method, and Mini-Map structure is similar to and MOTIP based on the N578 method.
Figure 1. The various types of the MMS Protocol Structures (Full-Map, Mini-Map, and MOTIP)
The implemented virtual factory communication system is based on the description of a practical test plant shown in Fig. 2 and Fig. 3. These figures show an overview (Fig. 2) and the layout (Fig. 3) of a practical test plant using the MOTIP based program. MOTIP based communication program have been tested with the Mini-Map and the Full-Map system using a developed gateway and the developed virtual factory communication system is a miniature of the test plant in Fig. 3.
Figure 2. Overview photo of the referenced practical test plant
As depicted in Fig. 4, the MMS functions convert a data control block (DCB) to the correspond parameters of the M services.