Blitz Posted January 8, 2011 Report Share Posted January 8, 2011 So far, the solution offered for expansion I/O's on multiple racks is the use of EX-RC1 remote expansion modules. This is great specially if I/O's are distributed over longer distances. However, if only 2 or 3 racks are installed on the same panel, the use of EX-RC1 becomes less practical. So, how about if Unitronics comes up with another local expansion adapter (e.g., say, EX-A2) which would have two (2) RJ-45 connection ports. For example, three expansion I/O racks on the same panel may be connected as follows: 1. Port1 of Rack1 is connected to OPLC. 2. Port2 of Rack1 is connected to Port1 of Rack2. 3. Port2 of Rack2 is connected to Port1 of Rack3. 4. Port2 of Rack3 is terminated. 5. The connecting cable length is less than 1m. This results to a 3-tiered local adapter racks on the same panel. Some benefits of having 1 to 3 local racks are: - simpler to implement - I/O data are more readily accessible -- no separate programming is required as when using RC1. - gives more flexibility on panel mounting (e.g., panel width issues with horizontal module mounting) Thanks. Quote Link to comment Share on other sites More sharing options...
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