By reading this LLDP information you can map the entire PROFINET network (the entire neighborhood). Information stored in the device includes system name and description (type of device), port name and description, IP management address, system capabilities, other network information and more. This table can be read out with Simple Network Management Protocol (SNMP) or through a PROFINET acyclic read record request. This is then stored in a data table known as the Discovery Management Information Base (MIB). Did you know everyone that lived there at every house? What about the people who live at the farthest end of the street? A device which supports LLDP will send a message to their neighbor stations on each switch port every few seconds to identify itself and give network related information. What is LLDP?įirst off, to describe what LLDP is, think of neighbors or a neighborhood where you’ve been. Finally the fourth would be to share network line and switch delays for high speed motion applications. The second is for easy device commissioning when setting up the network and third would be simple device replacement in case any device fails.
![siemens simatic s7-1200 lldp siemens simatic s7-1200 lldp](https://live.staticflickr.com/65535/51215529098_3f7d8c3974_b.jpg)
The first is to be able to discover, check, and maintain the topology of the PROFINET network and obtain diagnostics if something changes.
![siemens simatic s7-1200 lldp siemens simatic s7-1200 lldp](https://live.staticflickr.com/65535/51214171095_5f6cc06995_b.jpg)
![siemens simatic s7-1200 lldp siemens simatic s7-1200 lldp](https://live.staticflickr.com/65535/51216078129_d6130d1287_b.jpg)
There are multiple reasons for LLDP support. Unlike other competitor networks, all PROFINET devices support Link Layer Discovery Protocol (LLDP) which is defined in IEEE standard 802.1AB.