Physical Layer RG-6 coaxial cable with BNC connectors. The network topology is a line structure with short taps. ControlNet can operate with a single RG-6 coaxial cable bus, or a dual RG-6 coaxial cable bus for cable redundancy. Maximum cable length without repeaters is 1000m and maximum number of nodes on the bus is 99. However, there is a tradeoff between number of devices on the bus and total cable length. Repeaters can be used to further extend the cable length.

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  • Physical Layer RG-6 coaxial cable with BNC connectors. The network topology is a line structure with short taps. ControlNet can operate with a single RG-6 coaxial cable bus, or a dual RG-6 coaxial cable bus for cable redundancy. Maximum cable length without repeaters is 1000m and maximum number of nodes on the bus is 99. However, there is a tradeoff between number of devices on the bus and total cable length. Repeaters can be used to further extend the cable length. Optical fiber cables can also be used. The physical layer signaling uses Manchester code at 5 Mbit/s. Link Layer ControlNet is a scheduled communication network designed for cyclic data exchange. The protocol operates in cycles, known as NUTs, where NUT stands for Network Update Time. Each NUT has two phases, the first phase is dedicated to scheduled traffic, where all nodes with scheduled data are guaranteed a transmission opportunity. The second phase is dedicated to unscheduled traffic. There is no guarantee that every node will get an opportunity to transmit in every unscheduled phase. Both the scheduled and unscheduled phase use a implicit token ring media access method. The end of each NUT is marked by the transmission of a moderator frame by the node with the lowest MAC-ID on the network. The maximum size of a scheduled or unscheduled ControlNet data frame is 510 Bytes. Application Layer The ControlNet application layer protocol is based on the Common Industrial Protocol layer which is also used in DeviceNet and EtherNet/IP.
  • ControlNet est un système de communication industriel qui échange des données de façon déterminée et prévisible dans le temps. Les dispositifs utilisant ControlNet sont des entrées-sorties simples, comme des détecteurs/déclencheurs, aussi bien que des dispositifs de contrôle complexes comme des robots, des PLC, des contrôleurs de procédé, des interfaces opérateur, etc.
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  • Physical Layer RG-6 coaxial cable with BNC connectors. The network topology is a line structure with short taps. ControlNet can operate with a single RG-6 coaxial cable bus, or a dual RG-6 coaxial cable bus for cable redundancy. Maximum cable length without repeaters is 1000m and maximum number of nodes on the bus is 99. However, there is a tradeoff between number of devices on the bus and total cable length. Repeaters can be used to further extend the cable length.
  • ControlNet est un système de communication industriel qui échange des données de façon déterminée et prévisible dans le temps. Les dispositifs utilisant ControlNet sont des entrées-sorties simples, comme des détecteurs/déclencheurs, aussi bien que des dispositifs de contrôle complexes comme des robots, des PLC, des contrôleurs de procédé, des interfaces opérateur, etc.
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  • ControlNet
  • ControlNet
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