{"product_id":"allen-bradley-1786-rpfm-a-controlnet-fiber-repeater-module","title":"Allen-Bradley 1786-RPFM\/A ControlNet Fiber Repeater Module","description":"\u003ch2\u003eAllen-Bradley 1786-RPFM\/A ControlNet Fiber Repeater Module\u003c\/h2\u003e\n\u003cp\u003eConfigured for medium-distance network extension and electrical noise isolation in ControlNet deterministic networks, the \u003cstrong\u003eAllen-Bradley 1786-RPFM\/A\u003c\/strong\u003e (\u003cstrong\u003e1786-RPFM\u003c\/strong\u003e ControlNet Fiber Repeater Module) provides direct physical\/electrical execution. It converts standard electrical coaxial signals into 820 nm optical pulses, preventing ground loops and electromagnetic interference across multi-building and distributed control architectures.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e1786-RPFM\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.35 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e145 mm x 45 mm x 105 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e24 VDC via ControlNet tap\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNetwork Protocol\u003c\/td\u003e\n\u003ctd\u003eControlNet (5 Mbps deterministic)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFiber Optic Cable Type\u003c\/td\u003e\n\u003ctd\u003eMulti-mode 62.5\/125 um or 50\/125 um\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Distance\u003c\/td\u003e\n\u003ctd\u003e3000 m (9840 ft) per segment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Connector Type\u003c\/td\u003e\n\u003ctd\u003eST-style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Wavelength\u003c\/td\u003e\n\u003ctd\u003e820 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Power Budget\u003c\/td\u003e\n\u003ctd\u003e13.3 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Type\u003c\/td\u003e\n\u003ctd\u003eDIN-rail compatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eBackplane Bus Communication Velocity and Deterministic Control\u003c\/h3\u003e\n\u003cp\u003eThe 1786-RPFM\/A operates as a physical layer repeater designed to maintain EtherNet\/IP and ControlNet deterministic networks without introducing non-deterministic signal latency. In high-density PLC I\/O architectures, the module manages frame synchronization across the physical medium, ensuring real-time backplane bus communication velocity across extended segments. The hardware preserves scheduled I\/O traffic timing profiles and system firmware flash compatibility, allowing seamless integration into existing Allen-Bradley PLC-5, SLC 500, and ControlLogix networks without altering network schedule parameters or media access control (MAC) frame structures.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can the 1786-RPFM\/A be replaced while the rest of the ControlNet segment remains active?\u003c\/p\u003e\n\u003cp\u003eA: Yes. The module supports hot-swapping under power without interrupting communication on adjacent operational nodes, provided the physical ring or trunk topology permits redundant path routing.\u003c\/p\u003e\n\u003cp\u003eQ: What is the impact on signal latency when inserting a 1786-RPFM\/A fiber repeater into a network loop?\u003c\/p\u003e\n\u003cp\u003eA: The physical propagation delay added by the optical conversion hardware is negligible and fits within the standard ControlNet Network Access Time (NUT) configuration parameters.\u003c\/p\u003e\n\u003cp\u003eQ: How is power provided to the 1786-RPFM\/A module during standalone operation?\u003c\/p\u003e\n\u003cp\u003eA: The module draws its required 24 VDC operating power directly through the standard ControlNet tap connection connected to the module housing.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eMount the module securely on a grounded standard 35 mm DIN rail within an IP54 or NEMA 12 rated enclosure to protect against environmental contamination.\u003c\/li\u003e\n\u003cli\u003eEnsure the optical fiber cable ends are clean and terminated with high-quality ST connectors. Maintain a minimum bend radius of 30 mm for multi-mode fiber runs to avoid micro-bending signal attenuation.\u003c\/li\u003e\n\u003cli\u003eVerify that the optical power budget does not exceed 13.3 dB across the full length of the 3000 m fiber link using an optical power meter set to 820 nm prior to final commissioning.\u003c\/li\u003e\n\u003cli\u003eConnect the earth ground terminal of the mounting assembly to the main cabinet ground busbar using a short, low-impedance braided copper strap.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43756567330906,"sku":"1786-RPFM\/A","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1786-RPFMA.jpg?v=1785311225","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1786-rpfm-a-controlnet-fiber-repeater-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}