Industrial network refers to a fully digital, two-way, multi station communication system installed in the industrial production environment
There are three types:
(1) Dedicated and closed industrial network: the network specification is developed by companies, and is often set for a specific application field, with the highest efficiency. However, when connected with each other, it appears that various indicators are uneven, and it is difficult to coordinate the promotion and maintenance.
Private industrial networks have three development directions:
① Move towards a closed system to ensure market share.
② Move towards openness and make it a standard.
③ Design a dedicated gateway to connect with the open network.
(2) Open industrial network: except for some simple standards that are unconditional, most of them are conditional or only open to members. The manufacturer must become a member of the organization, and the products must be tested and certified by the organization before they can be used in the industrial network system.
(3) Standard industrial network: industrial networks that comply with international standards IEC61158, iec62026, iso111519 or European standard en50170, all of which will follow the iso/osi 7-layer reference model. Most industrial networks only use physical layer, data link layer and application layer. The formulation of general industrial network is based on the existing communication interface, or design the communication IC by yourself, and then set the data transmission format according to the application field. For example, the physical layer and data link layer of DeviceNet are based on CANbus, and the application layer specifications applicable to general i/o point applications are added.
At present, eight industrial fieldbus standards recognized by IEC61158 are fieldbus Type1, PROFIBUS, ControlNet, p-net, foundation fieldbus, SWIFTNet, WorldFIP and INTERBUS.
The emergence of network technology has the following advantages for industrial control:
(1) Convenient installation and wiring;
(3) Easy to diagnose;
(4) Self construction;
(5) Enterprise management.