Industrial networks options are many. If modifications are desired beyond the commercially available industrial networkCONTROL ENGINEERING China版权所有, suppliers offer commercial products that support protocols. In some cases, open source options may be a more viable option.
        Probably due to the cost of commercial products, many companies decide to start developing their own protocol stack. Often this turns out to be a bad decision, since the necessary effort is always much larger than initially expected.
        CAN is a protocol whose number of installed nodes surpass any other protocol by a very, very wide margin. However a disadvantage of CAN is that there is a large number of protocols控制工程网版权所有, which are mutually incompatible with each other. Hence, it is important to check that a certain “CAN” protocol stack implements the protocol needed.
        CANFestival software delivers a CAN/Open framework, usable on Linuxwww.cechina.cn, Windows and two microControllers控制工程网版权所有, for a number of CAN-boards sold by well-known suppliers. It provides an ANSI-C portable protocolstack that can be used on master or slave nodes.
        EtherCAT is the fastest industrial Ethernet protocol currently available. Since it requires dedicated hardware in the network slaves, no open-source implementation exists here. The master module can work with a standard Ethernet controller.
        Etherlab: Etherlab is the name of a product sold by the German company IgH控制工程网版权所有, combining hardware and software for test and automation purposes. One of the components of Etherlab is an EtherCAT master, supporting four (Realtek, Intel) Ethernet-controllers running on Linux (even without real-time extension). Their Website (www.etherlab.org) provides a list of all EtherCAT features that are supported.
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