{"product_id":"allen-bradley-1756-rm-b-controllogix-redundancy-module","title":"Allen-Bradley 1756-RM\/B ControlLogix Redundancy Module","description":"\u003ch2\u003eAllen-Bradley 1756-RM\/B ControlLogix Redundancy Module\u003c\/h2\u003e\n\u003cp\u003eConfigured for controller synchronization and failover execution in ControlLogix redundant chassis systems, the \u003cstrong\u003eAllen-Bradley 1756-RM\/B\u003c\/strong\u003e (\u003cstrong\u003e1756-RM\u003c\/strong\u003e Redundancy Module) provides direct physical and data communication execution between paired controller assemblies through a fiber optic redundancy link.\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\/B\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\u003e0.5 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e3.8 cm x 15.2 cm x 15.2 cm\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 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 (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 Backplane Communication and Firmware Compatibility\u003c\/h3\u003e\n\u003cp\u003eThe 1756-RM\/B operates within the ControlLogix backplane architecture to exchange synchronization data, redundancy status, and controller state information between paired chassis assemblies. The module uses a single-mode LC fiber optic connection for dedicated redundancy communication and supports deterministic controller synchronization.\u003c\/p\u003e\n\u003cp\u003eThe module supports firmware flash compatibility verification within ControlLogix systems to maintain matched controller configurations. Proper firmware alignment between redundancy modules, controllers, and associated communication modules is required before enabling redundant operation.\u003c\/p\u003e\n\u003cp\u003eThe ControlLogix architecture allows I\/O density scaling through multiple chassis configurations while maintaining synchronized controller operation. PRI, COM, and OK LED indicators provide local hardware status information for redundancy monitoring and module diagnostics.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What physical connection is used for redundancy synchronization on the 1756-RM\/B?\u003cbr\u003eA: The 1756-RM\/B uses a single-mode LC fiber optic connector with compatible 1756-RMC series redundancy cables.\u003c\/p\u003e\n\u003cp\u003eQ: What chassis types are compatible with the 1756-RM\/B module?\u003cbr\u003eA: The module supports 1756-A4, 1756-A7, 1756-A10, 1756-A13, and 1756-A17 ControlLogix chassis configurations.\u003c\/p\u003e\n\u003cp\u003eQ: What backplane power load is required by the module?\u003cbr\u003eA: The module requires chassis backplane power with current draw values of 4 mA at 1.2 VDC, 1.2 A at 5.1 VDC, and 120 mA at 24 VDC.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the 1756-RM\/B module in a compatible ControlLogix chassis slot and verify that both redundant chassis assemblies contain matching controller hardware, supported communication modules, and compatible firmware revisions.\u003c\/p\u003e\n\u003cp\u003eConnect the fiber optic redundancy cable to the LC interface and route optical cables away from high-voltage conductors, motor power wiring, and high electromagnetic interference sources. Protect the connector ends from contamination and mechanical damage during installation.\u003c\/p\u003e\n\u003cp\u003eVerify chassis grounding, power supply compatibility, and backplane power availability before system startup. Use standard industrial cabinet wiring practices for cable separation, shielding, and enclosure grounding.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43627691868250,"sku":"1756-RM\/B","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1756-RMB.jpg?v=1783668867","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1756-rm-b-controllogix-redundancy-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}