Ring Topology in ProfiBus

P

Thread Starter

Partha Sarkar

We are doing a project for a chemical plant. In this plant STAHL remote IO is used. There are 50 Romote IO cabinets. We want to get a solution so that Profibus NW can be used in ring topolgy (in a redundant way). The distance from the host of this remote IO is approx 300 m.
 
You can get a redundant profibus link using a ring topology by using fiber optic converters and a fiber backbone for the profibus network. The fiber modems automatically detect a break or fault in the fiber ring and send the data "round the other way" (for want of a better explanation). In fact, if your profibus is 300m long I would expect this to be much easier setup to install and troubleshoot than a copper based network.

Phoenix Contact amongst others make suitable modems.

www[.]lymac.co.nz
 
J
Ring topology using CONVERTERS is not quite redundancy.

The converter is not redundant. So the converter itself is a single point of failure.

The devices (PLC, remote-I/O, drive...) only have a single communication port so it is also a single point of failure.

The wire between the converter and the device is single (albeit short) and is a single point of failure.

In a truly redundant system each device has two communication ports, so if one port fails the other port can still be used. "Splitting T" is not required.

Cheers,
Jonas
 
Top