{"product_id":"allen-bradley-1756-rm2-a-controllogix-redundancy-module","title":"Allen-Bradley 1756-RM2\/A ControlLogix Redundancy Module","description":"\u003ch2\u003eAllen-Bradley 1756-RM2\/A ControlLogix Redundancy Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1756-RM2\/A\u003c\/strong\u003e serves as the primary \u003cstrong\u003e1756-RM\u003c\/strong\u003e Redundancy Module utilized to execute controller synchronization and failover control across ControlLogix redundant chassis platforms.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eModel Identifier\u003c\/th\u003e\n\u003cth\u003eDescription\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e1756-RM2\u003c\/td\u003e\n\u003ctd\u003eControlLogix Enhanced Redundancy Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\/A\u003c\/td\u003e\n\u003ctd\u003eHardware revision identifier\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1756-RM2\/A\u003c\/td\u003e\n\u003ctd\u003eComplete catalog configuration for the enhanced redundancy module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\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\u003e1756-RM2\/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\u003e0.64 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-25 deg C to 70 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e9 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003eControlLogix Enhanced Redundancy Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eController Redundancy\u003c\/td\u003e\n\u003ctd\u003eSupports two identical controllers in redundant chassis configurations\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Speed\u003c\/td\u003e\n\u003ctd\u003e1 Gbps fiber optic link\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Interface\u003c\/td\u003e\n\u003ctd\u003eLC fiber optic connector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRedundancy Cable Compatibility\u003c\/td\u003e\n\u003ctd\u003e1756-RMC1 (1 m), 1756-RMC3 (3 m), 1756-RMC10 (10 m)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Draw\u003c\/td\u003e\n\u003ctd\u003e4 mA at 1.2 VDC, 1.2 A at 5.1 VDC, 120 mA at 24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Dissipation\u003c\/td\u003e\n\u003ctd\u003e9 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThermal Dissipation\u003c\/td\u003e\n\u003ctd\u003e31 BTU\/hr\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd\u003e-40 deg C to 85 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelative Humidity\u003c\/td\u003e\n\u003ctd\u003e5% to 95%, non-condensing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShock Resistance\u003c\/td\u003e\n\u003ctd\u003e30 g operating, 50 g non-operating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVibration Resistance\u003c\/td\u003e\n\u003ctd\u003e2 g at 10-500 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChassis Compatibility\u003c\/td\u003e\n\u003ctd\u003e1756-A4, 1756-A7, 1756-A10, 1756-A13, 1756-A17\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Supply Compatibility\u003c\/td\u003e\n\u003ctd\u003e1756-PA72, 1756-PA75, 1756-PB72, 1756-PB75, 1756-PA75R, 1756-PB75R, PSCA2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnclosure Type\u003c\/td\u003e\n\u003ctd\u003eOpen-style module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eControlLogix High-Speed Redundancy Communication\u003c\/h3\u003e\n\u003cp\u003eThe 1756-RM2\/A operates through the ControlLogix backplane architecture and uses a 1 Gbps LC fiber optic communication link for controller synchronization and redundancy status exchange. The module maintains synchronized controller states between paired chassis assemblies and provides local diagnostic indication through integrated module status monitoring.\u003c\/p\u003e\n\u003cp\u003eThe enhanced redundancy design supports firmware flash compatibility checks and higher-speed synchronization compared with earlier 1756-RM series modules. Matching controller firmware, chassis configuration, and compatible communication modules are required for deterministic redundancy operation.\u003c\/p\u003e\n\u003cp\u003eThe module supports I\/O density scaling within ControlLogix architectures by maintaining synchronized operation across redundant controller platforms. The redundancy link is isolated from standard controller communication networks to provide dedicated synchronization data transfer.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What communication interface is used by the 1756-RM2\/A redundancy link?\u003cbr\u003eA: The 1756-RM2\/A uses an LC fiber optic interface with 1 Gbps communication speed for redundant chassis synchronization.\u003c\/p\u003e\n\u003cp\u003eQ: Is the 1756-RM2\/A compatible with earlier 1756-RM configurations?\u003cbr\u003eA: The 1756-RM2\/A requires compatible redundancy firmware and matching ControlLogix components. System compatibility must be verified before installation.\u003c\/p\u003e\n\u003cp\u003eQ: What environmental temperature range is specified for the 1756-RM2\/A?\u003cbr\u003eA: The operating temperature range is -25 deg C to 70 deg C, with storage temperature from -40 deg C to 85 deg C.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the 1756-RM2\/A module in an approved ControlLogix chassis slot and verify that redundant chassis assemblies contain matching controller hardware and compatible firmware revisions.\u003c\/p\u003e\n\u003cp\u003eConnect the LC fiber optic redundancy cable according to the installation requirements. Route fiber cables separately from high-voltage conductors, motor wiring, and sources of electromagnetic interference. Protect optical connectors from contamination and mechanical stress.\u003c\/p\u003e\n\u003cp\u003eVerify chassis grounding, power supply compatibility, and backplane power availability before enabling redundancy functions. Apply standard industrial cabinet practices for cable segregation, shielding, and enclosure grounding.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43627700879450,"sku":"1756-RM2\/A","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1756-RM2_254c077f-142e-412a-b616-a042699cdc40.jpg?v=1783668242","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1756-rm2-a-controllogix-redundancy-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}