{"product_id":"allen-bradley-1756-rm-a-controllogix-redundancy-module","title":"Allen-Bradley 1756-RM\/A ControlLogix Redundancy Module","description":"\u003ch2\u003eAllen-Bradley 1756-RM\/A ControlLogix Redundancy Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1756-RM\/A\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1756-RM\u003c\/strong\u003e Redundancy Module, operates as a dedicated hardware component for controller synchronization and failover execution within ControlLogix redundant chassis platforms.\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\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-RM\/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\u003e0 deg C to 60 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 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\u003e100 Mbps with same-series redundancy modules\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Interface\u003c\/td\u003e\n\u003ctd\u003eSingle-mode LC 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, 1756-RMC3, 1756-RMC10\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\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 Backplane and Deterministic Redundancy Communication\u003c\/h3\u003e\n\u003cp\u003eThe 1756-RM\/A operates through the ControlLogix backplane architecture to exchange redundancy status and synchronization information between paired controller chassis. The module supports deterministic data transfer through a dedicated single-mode LC fiber optic link and maintains communication between matching controller assemblies.\u003c\/p\u003e\n\u003cp\u003eThe module requires identical controller configurations and compatible firmware conditions for redundancy operation. ControlLogix firmware flash compatibility must be verified before deployment to ensure matched controller and redundancy module operation.\u003c\/p\u003e\n\u003cp\u003eThe redundancy architecture supports I\/O density scaling by allowing multiple ControlLogix system configurations while maintaining synchronized controller states. Proper chassis matching and backplane communication configuration are required for system-level failover execution.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What type of communication connection is used between redundant chassis?\u003cbr\u003eA: The 1756-RM\/A uses a single-mode LC fiber optic connection for redundancy communication between paired ControlLogix chassis.\u003c\/p\u003e\n\u003cp\u003eQ: Can the 1756-RM\/A operate with non-identical controller chassis configurations?\u003cbr\u003eA: No. Redundancy operation requires matching controller hardware configurations, compatible firmware revisions, and supported chassis combinations.\u003c\/p\u003e\n\u003cp\u003eQ: What is the maximum power dissipation of the module?\u003cbr\u003eA: The 1756-RM\/A has a specified power dissipation of 9 W with thermal dissipation of 31 BTU\/hr.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the 1756-RM\/A module in a compatible ControlLogix chassis slot and verify that both redundant chassis assemblies contain matching controller modules, communication modules, and firmware revisions.\u003c\/p\u003e\n\u003cp\u003eConnect the fiber optic redundancy cable using the specified LC interface and route fiber cables separately from high-voltage conductors and electromagnetic noise sources. Avoid mechanical stress, sharp bends, and contamination of optical connectors during installation.\u003c\/p\u003e\n\u003cp\u003eConfirm chassis grounding, power supply compatibility, and backplane power availability before enabling redundancy functions. Follow standard industrial cabinet wiring practices for cable segregation and shield termination.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43627690229850,"sku":"1756-RM\/A","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1756-RMA2.jpg?v=1783668675","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1756-rm-a-controllogix-redundancy-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}