Method for operating a network

Abstract

The invention relates to a network with redundancy and linear topology, in particular to a process automation fieldbus network (PROFIBUS PA-Netzwerk). The two line ends (E1, E2) are connected to a redundancy manager (RM). Under normal circumstances, the redundancy manager (RM) separates the two line ends (E1, E2). In the event of a failure, the two line ends (E1, E2) are separated. connected to the line ends (E1, E2). The redundancy manager (RM) will provide a voltage input to a first line end (E1), this voltage is used to drive the movement of subscribers connected to the network (11) through a branch unit (T1-T4) respectively. Telephone (F1-F4). After receiving a voltage on one of its network interfaces, the tributary units (T1-T4) detect the status of the cables (H1-H5) connected to the other network interfaces and only continue to transmit voltage under normal circumstances. If the redundancy manager (RM) does not detect the voltage at the other line end (E2) at least within a specified period of time after power supply, the redundancy manager supplies this voltage. The cable (H2) has a fault location (12) that is disconnected from the line by the branch units (T1-T3).

Description

technical field [0001] The present invention relates to a redundant network, in particular to a PROFIBUSPA-Netzwerk (Process Automation Fieldbus Network), a branch unit for user equipment in said network, a branch unit for said network A redundancy manager, and a method of operation of the network. Background technique [0002] In automation technology process plants with wiring of "conventional" field devices, such as measuring transducers and / or control mechanisms, the field devices are routed via four-wire backbone cables and junction boxes with the aid of an own core pair And respectively connected with a programmable controller, because each field instrument works in the case of physical separation from each other, therefore, even if one of the field instruments fails or the transmission line leading to this field instrument is interrupted, it will not It will affect the functions of other field instruments. [0003] In field instruments that communicate with programm...

AI Technical Summary

Problems solved by technology

The disadvantage is that the test telegrams transmitted via the redundancy manager to the two line ends constitute an additional load on the network and thus reduce the transmission capacity of the network

In addition, in some bus systems, while the data is being transmitted, the energy required for the operation of the user equipment connected to the bus cable is also transmitted through the bus cable, so this monitoring principle and conversion principle are not applicable to this bus system

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