{"product_id":"1761-l20awa-5a-allen-bradley-micrologix-redundant-h1-terminal-block","title":"1761-L20AWA-5A Allen-Bradley MicroLogix Redundant H1 Terminal Block","description":"\u003cp\u003eConfigured for mixed signal acquisition and switching in localized control loops, the \u003cstrong\u003eAllen-Bradley 1761-L20AWA-5A\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1761-L20AWA-5A\u003c\/strong\u003e Programmable Logic Controllers, executes deterministic ladder logic and peripheral management.\u003c\/p\u003e\n\u003ch3\u003ePart Number Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCatalog Number: 1761-L20AWA-5A\u003c\/li\u003e\n\u003cli\u003eSystem Architecture: MicroLogix 1000 Fixed Controller Series\u003c\/li\u003e\n\u003cli\u003eCapacity Rating: 20 total physical I\/O points\u003c\/li\u003e\n\u003cli\u003eEmbedded Protocol: DF1 point-to-point and multi-drop communication protocol\u003c\/li\u003e\n\u003c\/ul\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\u003e1761-L20AWA-5A\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\u003e1.5 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Dimensions\u003c\/td\u003e\n\u003ctd\u003e20 x 8.5 x 7 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 deg C to 55 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e120 VAC line powered configuration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage Type\u003c\/td\u003e\n\u003ctd\u003e120 Volts AC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage Range\u003c\/td\u003e\n\u003ctd\u003e79 to 132 Volts AC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiscrete Inputs\u003c\/td\u003e\n\u003ctd\u003e12 points\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDigital Outputs\u003c\/td\u003e\n\u003ctd\u003e8 relay contact points\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnalog Channels\u003c\/td\u003e\n\u003ctd\u003e4 inputs and 1 output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eNetwork Communication \u0026amp; Architecture Scaling\u003c\/h3\u003e\n\u003cp\u003eThe controller manages data exchanges via high-speed serial links, supporting deterministic network topologies and backplane bus communication velocity frameworks. Firmware flash compatibility allows seamless software updates, while I\/O density scaling optimizes panel space utilization across standalone machine automation projects.\u003c\/p\u003e\n\u003ch3\u003eOrder Deliverables \u0026amp; Package Contents\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x Allen-Bradley 1761-L20AWA-5A controller unit\u003c\/li\u003e\n\u003cli\u003e1 x Removable screw-clamp terminal block set\u003c\/li\u003e\n\u003cli\u003e1 x Technical safety and hardware reference sheet\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eMechanical Installation \u0026amp; Wiring Instructions\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCabinet Mounting: Secure the controller directly to a grounded backpanel using standard M4 mounting screws or snap it securely onto an industrial DIN-rail.\u003c\/li\u003e\n\u003cli\u003eAC Line Separation: Route high-voltage 120 VAC incoming power lines and relay switching conductors through separate wire troughs away from low-level analog channels.\u003c\/li\u003e\n\u003cli\u003eTorque Regulation: Tighten terminal block screws to manufacturer-specified torque limits to prevent intermittent electrical contact under high-vibration conditions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eHow does the Master Control Relay (MCR) feature behave during an emergency stop condition?\u003c\/p\u003e\n\u003cp\u003eWhen the MCR circuit is opened externally, it drops power to all unlatched relay outputs simultaneously, halting field actuators instantly.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCan the embedded analog channels be reconfigured for thermocouple inputs directly?\u003c\/p\u003e\n\u003cp\u003eNo, the built-in analog circuits are designed strictly for standard voltage or current loops and require external transmitters for thermocouples.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat precautions must be taken when driving inductive loads with the relay outputs?\u003c\/p\u003e\n\u003cp\u003eAn external RC snubber network or flyback diode must be installed across inductive loads to suppress arcing and extend relay contact lifespan.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIs it possible to hot-swap this fixed I\/O controller while the AC power is active?\u003c\/p\u003e\n\u003cp\u003eNo, hot-swapping is prohibited; power must be completely disconnected from the unit before plugging or unplugging field wiring blocks.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat communication software is required to program this specific model?\u003c\/p\u003e\n\u003cp\u003eProgramming and configuration require RSLogix 500 software communicating through a serial port converter via the DF1 protocol.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHow are firmware updates applied to this hardware version?\u003c\/p\u003e\n\u003cp\u003eFirmware updates are executed via a PC-to-controller serial connection using specialized flash utility software provided by Rockwell Automation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat happens if the input voltage drops below the 79 VAC threshold?\u003c\/p\u003e\n\u003cp\u003eThe internal circuitry will register an input drop-out state, causing the corresponding logic points in the user program to transition to a zero state.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhy is the unit weight heavier compared to modular micro-controllers?\u003c\/p\u003e\n\u003cp\u003eThe 1.5 kg weight reflects the inclusion of an integrated heavy-duty internal power supply transformer and robust relay isolation barriers.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":46066423103661,"sku":"1761-L20AWA-5A","price":159.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/1613\/9181\/files\/1761-L20AWA-5A_24.jpg?v=1785743324","url":"https:\/\/www.maxwellplc.com\/ga\/products\/1761-l20awa-5a-allen-bradley-micrologix-redundant-h1-terminal-block","provider":"Maxwell PLC Ltd","version":"1.0","type":"link"}