Can RFO in HNet be connected in closed loop
Probably I did not explain well but your answer is not accurate. I have attached a couple of drawings one with S800 and the other one with Rack I/O.
My question was, can I include a remote I/O in the fiber optic link making a ring? According with the rack I/O drawing and if none INFI expert say the opposite, the answer is NO, only star is possible
We need a second IOR to connect in star the second remote I/O in the HNet or by other hand we can use TB825 in the Modulebus. Always in star
We have a fairly significant amount of using the S800 I/O with the Harmony Bridge Controllers, so I hope that the following answers your questions.
If I understand your initial question correctly, “can I put those RFO closing loop or HNet is always a bus and we require a couple of RFO per location in star like TB825 in Modulebus?”
· Neither the HNET nor the Fiber-Optic connections may be run in a ring or a “closed loop” to provide a bi-directional path (redundant paths in a ring). They are only run in a linear bus.
· The HNET, as mentioned in the other response is a redundant 1MB communication link/path but run on the single HNET cable from the back of the controller to either the IOR800 or to the RFO800, depending on the method of implementation that you chose to use. Once you come out of the IOR800 or the RFO800, the fiber-optic communication path may be redundant using two fiber-optic lines.
· If you use the RFO800 to connect to the remote I/O, then the connections must be BRC/HPG module to RFO800 via an HNET cable on the “local” side and then via fiber-optic to another RF800 on the “remote” side, which then uses another HNET cable to the IOR800, which then connects to the I/O modules through a fiber-optic cable (TK811) to either a TB840/TU841 for redundancy or the TB820 or TB840/TU807 for non-redundant connection.
· Alternatively, a more cost-effective solution or if you would like to hook up the remote I/O in a “star” configuration (i.e. going to multiple cabinets from the controller cabinet) you should use the TB825 fiber media converters that convert from the ABB TK811 cable to a standard 62.5/125 micron mult-mode fiber cable with ST connectors. Using this approach you locate the IOR800(s) in the same area with the controllers and then using the TB825 modules (redundancy requires two pair of TB825 per remote cabinet being connected assuming that you are running fiber between each cabinet). This architecture would done as shown in the link provided by Sumit Gargav.
· The IOR800 supports a maximum of 7 I/O clusters per IOR800 (max 12 modules per cluster or 84 modules per IOR800). If you need to go beyond 7 I/O clusters you must add an IOR800 for each 7 I/O clusters.
Good luck and I hope that this helps to clarify things for you.