{"product_id":"1772-ls-allen-bradley-plc-2-series-processor-module","title":"1772-LS Allen-Bradley PLC-2 Series Processor Module","description":"\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1772-LS\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1772LS\u003c\/strong\u003e PLC-2\/05 Processor Module, operates as a dedicated hardware component for program execution and digital I\/O processing within Mini-PLC-2\/05 controller platforms.\u003c\/p\u003e\n\u003ch3\u003eModel Identification \u0026amp; Configuration\u003c\/h3\u003e\n\u003cp\u003eThe 1772-LS is a Mini-PLC-2\/05 processor module designed for PLC-2 series control systems. The module provides processor execution, memory storage, and I\/O scanning functions through the PLC chassis backplane. It contains 3K words of CMOS RAM and operates with external 120 VAC system power.\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\u003e1772-LS\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\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003ePLC Processor Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003ePLC-2 Series\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 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Dimensions\u003c\/td\u003e\n\u003ctd\u003e5.1 x 27.9 x 15.2 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e42 Ampere, 120 VAC, 50\/60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProcessor Type\u003c\/td\u003e\n\u003ctd\u003eMini-PLC-2\/05 Processor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMemory Size\u003c\/td\u003e\n\u003ctd\u003e3K Words CMOS RAM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eI\/O Capacity\u003c\/td\u003e\n\u003ctd\u003e6 I\/O modules\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstallation Location\u003c\/td\u003e\n\u003ctd\u003eLeft-most slot of I\/O chassis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Modes\u003c\/td\u003e\n\u003ctd\u003eRUN, TEST, PROG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStatus Indicators\u003c\/td\u003e\n\u003ctd\u003ePROC RUN, FAULT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Supply\u003c\/td\u003e\n\u003ctd\u003e120 VAC input system\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003ePLC-2 Processor Architecture\u003c\/h3\u003e\n\u003cp\u003eThe Allen-Bradley 1772-LS uses PLC-2 series processor architecture for sequential instruction execution, internal memory handling, and digital I\/O control. The processor communicates with connected I\/O modules through the chassis backplane and manages controller operating states through RUN, TEST, and PROG modes.\u003c\/p\u003e\n\u003cp\u003eThe module design reflects Allen-Bradley legacy PLC hardware structures. Firmware operation, I\/O addressing, and chassis configuration are dependent on the original PLC-2 system design and are not compatible with newer ControlLogix or EtherNet\/IP platforms.\u003c\/p\u003e\n\u003ch3\u003eIndustrial Control Compatibility\u003c\/h3\u003e\n\u003cp\u003eThe 1772-LS supports legacy PLC digital control applications through fixed I\/O chassis communication. The processor module uses backplane bus communication methods rather than modern deterministic Ethernet networks.\u003c\/p\u003e\n\u003cp\u003eThe PLC-2 architecture requires correct processor slot placement, I\/O module arrangement, and memory verification during maintenance replacement. Program retention depends on the installed CMOS RAM memory configuration.\u003c\/p\u003e\n\u003ch3\u003eOrdering Information\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x Allen-Bradley 1772-LS PLC-2\/05 Processor Module\u003c\/li\u003e\n\u003cli\u003e1 x PLC-2 series processor hardware assembly\u003c\/li\u003e\n\u003cli\u003e1 x Installed CMOS RAM memory system\u003c\/li\u003e\n\u003cli\u003e1 x Module identification label\u003c\/li\u003e\n\u003cli\u003e1 x Technical inspection record\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eProcessor Mounting\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eInstall the 1772-LS in the left-most slot position of the compatible I\/O chassis.\u003c\/li\u003e\n\u003cli\u003eConfirm chassis alignment before insertion.\u003c\/li\u003e\n\u003cli\u003eVerify backplane connector condition before installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePower Connection\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eConfirm the 120 VAC supply specification before energizing the system.\u003c\/li\u003e\n\u003cli\u003eInspect power wiring and grounding connections according to the original PLC installation requirements.\u003c\/li\u003e\n\u003cli\u003eDo not remove or insert the processor module under energized conditions unless the chassis design permits hot insertion.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSystem Verification\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eConfirm PLC-2 program memory status before operation.\u003c\/li\u003e\n\u003cli\u003eCheck PROC RUN and FAULT indicators after startup.\u003c\/li\u003e\n\u003cli\u003eVerify I\/O module configuration matches the existing control program.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWhat controller system uses the 1772-LS processor?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 1772-LS is a PLC-2\/05 processor module designed for Allen-Bradley Mini-PLC-2 control systems.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWhat type of memory is installed in the 1772-LS?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe processor uses CMOS RAM memory with a capacity of 3K words for PLC program storage.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the 1772-LS include a power supply?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The processor module requires a separate compatible system power supply arrangement.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWhere is the 1772-LS installed in the chassis?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe module is installed in the left-most slot of the compatible PLC-2 I\/O chassis.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWhat operating modes are available on the processor?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe module supports RUN, TEST, and PROG operating modes for controller execution and maintenance.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHow many I\/O modules can the 1772-LS support?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe processor supports connection with up to 6 I\/O modules within the PLC-2\/05 chassis configuration.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the 1772-LS support EtherNet\/IP communication?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The module uses legacy PLC-2 backplane communication and does not include Ethernet interfaces.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWhat indicators are available for diagnostics?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe processor provides PROC RUN and FAULT indicators for basic operating status monitoring.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":46066444796077,"sku":"1772-LS","price":88.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/1613\/9181\/files\/1772-LS0.jpg?v=1785856265","url":"https:\/\/www.maxwellplc.com\/ga\/products\/1772-ls-allen-bradley-plc-2-series-processor-module","provider":"Maxwell PLC Ltd","version":"1.0","type":"link"}