1786-RPFRL Allen-Bradley Fiber Ring Repeater Module Signal Range 4...20mA

Description of 1786-RPFRL

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 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.

The Allen-Bradley 1786-RPFRL module is a ControlNet fiber optic ring repeater module. It supports fiber media redundancy through the use of a ring topology which enables long transmission ranges, protection against electromagnetic interference, and ground isolation between the nodes. The distance between fiber repeaters depends on a number of factors including the fiber quality, number of splices, and number of connectors. For the 1786-RPFRL module, the loss on the fiber links must be less than 15 dB. The total length of the fiber ring is limited by the ControlNet standard to 20 kilometers or less. Plastic or ceramic ST fiber connectors should be used with the module. Metal connectors are not supported.

The 1786-RPFRL module provides 2 fiber channels, status indicators for activity on each fiber channel, and a relay contact connector for system status and communication updates. The power input requirements for the module are 570 milliamps at 5 Volts DC. The power requirements of the backplane are 2.8 Watts (3.02 Watts maximum). The supported communication rate is 5 Mbps. The module can be mounted in any orientation. The maximum voltage for the relay contactor is 30 Volts DC. The minimum and maximum currents for the relay contactor are 1 milliamp and 900 milliamps, respectively. The isolation voltage rating is 50 Volts continuous. The wire size recommended for use with the 1786-RPFRL module is 22 to 14 AWG solid or stranded copper wire which is rated at 75 degrees Celsius or higher. The 1786-RPFRL module is an open module and it complies with T5 North American temperature code. The temperature of the air around the 1786-RPFRL module should never exceed 60 degrees Celsius.