{"product_id":"allen-bradley-1756-rm2-b-controllogix-redundancy-module","title":"Allen-Bradley 1756-RM2\/B ControlLogix Redundancy Module","description":"\u003ch2\u003eAllen-Bradley 1756-RM2\/B ControlLogix Redundancy Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1756-RM2\/B\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1756-RM2\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-RM2\/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\u003e0.64 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 Deterministic Redundancy Communication\u003c\/h3\u003e\n\u003cp\u003eThe 1756-RM2\/B operates through the ControlLogix backplane architecture and provides dedicated redundancy synchronization through a 1 Gbps LC fiber optic communication link. The module exchanges controller status, synchronization information, and redundancy control data between paired chassis assemblies.\u003c\/p\u003e\n\u003cp\u003eFirmware flash compatibility is required between redundant controllers, communication modules, and redundancy hardware before system activation. The module supports ControlLogix I\/O density scaling by maintaining synchronized controller states across matched chassis configurations.\u003c\/p\u003e\n\u003cp\u003eThe redundancy communication path is isolated from standard application communication channels, allowing deterministic transfer of synchronization data. Hardware diagnostics are provided through module status indicators for local verification of redundancy operating conditions.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What fiber optic interface is used by the 1756-RM2\/B module?\u003cbr\u003eA: The 1756-RM2\/B uses an LC fiber optic connector with a 1 Gbps redundancy communication link.\u003c\/p\u003e\n\u003cp\u003eQ: What controller configuration is required for redundancy operation?\u003cbr\u003eA: The module requires two identical controller chassis configurations with compatible firmware and supported ControlLogix components.\u003c\/p\u003e\n\u003cp\u003eQ: What is the specified operating temperature range of the 1756-RM2\/B?\u003cbr\u003eA: The operating temperature range is -25 deg C to 70 deg C.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the 1756-RM2\/B module in a compatible ControlLogix chassis slot and confirm that both redundant chassis assemblies contain matching controllers, supported communication modules, and compatible firmware revisions.\u003c\/p\u003e\n\u003cp\u003eConnect the LC fiber optic redundancy cable using approved routing practices. Keep optical cables separated from high-voltage wiring, motor circuits, and strong electromagnetic interference sources. Protect fiber 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 separation, shielding, and enclosure grounding.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43627712118874,"sku":"1756-RM2\/B","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-rm2-b-controllogix-redundancy-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}