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Networking of Sensors and Control Systems in Manufacturing
The token is a control word, and each MAP node can initiate communication only if it passes the token. It is interesting to note that MAP nodes that are not a part of the logic ring will never possess the token, but they may still respond to a token holder if a message is addressed to them. Token management is handled at the data link layer (DL)2 of the OSI model. This layer controls the features of the token application with respect to how long a token can be held, the sequence of addresses that is to take place, and the amount of time allowed for retrying communications before failure is assumed. If the logic ring is broken at some point for example, if one equipment unit is no longer able to operate the other nodes will wait a certain length of time and then will reform the token passing scheme. They will do this by using an algorithm, through which the token is awarded to the highest station address in contention. The rest of the stations on the ring are then determined by the highest-address successors. This process is repeated until the token ring is re-formed. Physical layer (PhL)1 involves encoding and modulation of the message so that the digital data are transferred into analog and digital communication signals. Each MAP application requires a modem for this purpose. The modem takes the extended message that has been developed at higher layers and modifies it so it can be used to provide an electronic signal to the communications medium. The medium itself provides the means for transferring the signal from User 1 to User 2. MAP continues to be an important protocol approach for sensors and control systems in computer-integrated manufacturing. For very large factories, the broadband option is available, and for smaller factories a carrier-band system is also available. A number of vendors now produce the hardware and software necessary to establish a MAP network. However, such networks typically are quite high in cost and, because of the complexity of the protocol, can also be difficult to develop and maintain. Thus, MAP is only one of several solutions available to planning and implementation teams.
Multiple-Ring Digital Communication Network AbNET
An optical-fiber digital communication network has been proposed to support the data acquisition and control functions of electric power distribution networks. The optical-fiber links would follow the power distribution routes. Since the fiber can cross open power switches, the communication network would include multiple interconnected loops with occasional spurs (Fig. 4.18). At each intersection, a node is needed. The nodes of the communication network
Four
Substation
Substation
Substation Key: Node Gateway
FIGURE 4.18
Multiple-ring digital communication network AbNET.
would also include power distribution substations and power controlling units. In addition to serving data acquisition and control functions, each node would act as a repeater, passing on messages to the next node. Network topology is arbitrary, governed by the power system. The token ring protocols used in single-ring digital communication networks are not adequate. The multiple-ring communication network would operate on the new AbNET protocol, which has already been developed, and would feature fiber optics for this more complicated network. Initially, a message inserted anywhere in the network would pass from node to node throughout the network, eventually reaching all connected nodes. On the first reception of a message, each node would record an identifying number and transmit the message to the next node. On second reception of the message, each node would recognize the identifying number and refrain from retransmitting the message. This would prevent the endless repetition and recirculating of messages. This aspect of the protocol resembles the behavior of cells in the immune system, which learn to recognize invading organisms on first exposure and kill them with antibodies when they encounter the organisms again. For this reason, the protocol is called AbNET after the microbiologists abbreviation Ab for antibodies. The AbNET protocols include features designed to maximize the efficiency and fault-tolerant nature of the approach. Multiple service territories can be accommodated, interconnected by gateway nodes (Fig. 4.18). The AbNET protocol is expected to enable a network to operate as economically as a single ring that includes an active monitor node to
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