1786-RPFRXL ControlNet modular repeater adapter

The Allen-Bradley 1786-RPAB adapter is a ControlNet modular repeater adapter. It works with an RG6 copper coax fiber type and it is capable of connecting multiple modules. To be exact, the 1786-RPAB repeater adapter can connect up to 2 modules when it is used with either the Allen-Bradley 1786-RPFRXL/B or the 1786-RPFRL modules and with up to 4 modules that are the Allen-Bradley 1786-RPFS, 1786-RPCD, or the 1786-RPFM repeater modules. The 1786-RPAB repeater adapter requires 24 Volts DC input power and at 5 Volts DC, it can provide up to a maximum of 1.6 Amps of backplane output current.

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1786-RPFRXL ControlNet modular repeater adapter

Product description

The Allen-Bradley 1786-RPAB adapter is a ControlNet modular repeater adapter. It works with an RG6 copper coax fiber type and it is capable of connecting multiple modules. To be exact, the 1786-RPAB repeater adapter can connect up to 2 modules when it is used with either the Allen-Bradley 1786-RPFRXL/B or the 1786-RPFRL modules and with up to 4 modules that are the Allen-Bradley 1786-RPFS, 1786-RPCD, or the 1786-RPFM repeater modules. The 1786-RPAB repeater adapter requires 24 Volts DC input power and at 5 Volts DC, it can provide up to a maximum of 1.6 Amps of backplane output current.

The total loss of the fiber-optic cable between two modules must not exceed the optical power budget. The total loss is the sum of each connector loss plus the loss of the fiber plus the loss associated with the splices in the system, if any. The total loss can be determined as follows:
Total loss = [(loss per connector) x (the number of connectors)] + [(loss per km of fiber) x (km of fiber)] + [(other losses)]
For example, with 2 connectors, each having 0.3 dB of loss, 10 km of multimode fiber with a loss of 1 dB/km, and no splices, the total loss is 10.6 dB. See the following formula:
Total loss = [(0.3 dB x 2) + (1 dB/km x 10 km)]
Total loss = 10.6 dB
This fiber-optic cable is acceptable for use between two
1786-RPFRL/B modules because the total loss is less than the optical power budget of 15 dB. However, this cable could not be used with the 1786-RPFRXL/B module because the total loss exceeds the optical power budget of 10.5 dB.

1786-RPFRXL

Product parameter

The maximum number of repeater modules (in any combination) you can use in a configuration is dependent on the current draw of each repeater module. Total current draw supplied by the 1786-RPA/B repeater adapter cannot exceed 1.6 A @ 5V DC.
In addition to using the fiber repeater in a ring topology, you can do the following:
• Extend the total length of your segment
• Create a point-to-point or star configuration (multiple directions from one point)
• Provide electrical isolation and immunity to interference
• Use in hazardous areas
The number of fiber repeaters and cable length total limit depends on your network topology.

Application field

The 1786-RPAB repeater adapter serves different functions such as for extending the network’s length, performing network media conversions from coaxial or copper media to fiber media as well as from fiber media to coaxial or copper media, providing power to the repeater modules, and the creation of a ring, star, or point-to-point network topology. Both the repeater adapters and repeater modules are equipped with 2 status indicators, which indicates if they are both powered up or if a fault has been detected (also known as ready/fault), and if errors are present on the data that is being received at the adapters and modules. The entire 1786-RPAB repeater adapter has an approximate measurement of 4 x 4 x 3 inches, and it weighs around 7 ounces. This Series B repeater adapter is also known as the 1786-RPA/B

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