{"product_id":"1775-med-allen-bradley-plc-3-series-memory-module","title":"1775-MED Allen-Bradley PLC-3 Series Memory Module","description":"\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1775-MED\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1775MED\u003c\/strong\u003e Memory Module, operates as a dedicated hardware component for error-correcting RAM retention and logic execution within PLC-3 control system racks.\u003c\/p\u003e\n\u003ch3\u003eModel Catalog Architecture\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1775\u003c\/strong\u003e: Bulletin 1775 PLC-3 system hardware family.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMED\u003c\/strong\u003e: Error-correcting RAM memory module unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e16-bit\u003c\/strong\u003e: Standard word length architecture for processor system addressing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRAM\u003c\/strong\u003e: Error-correcting random-access memory storage structure.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Performance Parameters\u003c\/h3\u003e\n\u003cfigure\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\u003e1775-MED\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\u003e3.1 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Dimensions\u003c\/td\u003e\n\u003ctd\u003e4.6 x 30.0 x 39.5 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to +60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e2 W (typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMemory Capacity\u003c\/td\u003e\n\u003ctd\u003e8K Words (16KB) \/ 128K RAM Option\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWord Length\u003c\/td\u003e\n\u003ctd\u003e16-bit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccess Time\u003c\/td\u003e\n\u003ctd\u003e450 ns\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Voltage\u003c\/td\u003e\n\u003ctd\u003e5 VDC (+\/-5%) via backplane\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandby Current\u003c\/td\u003e\n\u003ctd\u003e100 uA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eBackplane Communications \u0026amp; System Microcode\u003c\/h3\u003e\n\u003cp\u003eThe module interfaces directly with the central processing unit across the rack backplane bus, enabling deterministic memory access cycles at 450 ns speeds. Internal logic supports system microcode execution and maintains strict firmware flash compatibility across connected PLC processor cards, minimizing backplane latency during high-speed I\/O scan routines.\u003c\/p\u003e\n\u003ch3\u003ePackage Component List\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x Allen-Bradley 1775-MED Memory Module\u003c\/li\u003e\n\u003cli\u003e1 x Static Protective Packaging Sleeve\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eRack Installation \u0026amp; Physical Handling Standards\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePower Interruption Protocol\n\u003cul\u003e\n\u003cli\u003eAlways disconnect system power from the main rack backplane before inserting or removing the memory card to prevent bus logic corruption.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eElectrostatic Discharge Protection\n\u003cul\u003e\n\u003cli\u003eGround all servicing tools and wear a grounded wrist strap before handling module edge connectors to preserve semiconductor logic.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eCard Guide Mechanical Alignment\n\u003cul\u003e\n\u003cli\u003eAlign the circuit card carefully with top and bottom rack guide rails, seating backplane connectors securely into the chassis socket.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eChassis Thermal Management\n\u003cul\u003e\n\u003cli\u003eMaintain unobstructed airflow across rack ventilation slots to ensure ambient temperatures remain within 0 to +60 deg C during active operation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical FAQs\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eWhat is the primary functional access time for the 1775-MED memory circuit?\u003c\/p\u003e\n\u003cp\u003eThe memory array features an access speed of 450 ns for high-speed backplane data retrieval.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat voltage is required to power the memory card logic?\u003c\/p\u003e\n\u003cp\u003eThe card operates on a 5 VDC (+\/-5%) power rail supplied directly through the chassis backplane bus.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCan this memory module be inserted while the PLC rack is powered up?\u003c\/p\u003e\n\u003cp\u003eNo, removing or inserting the card under backplane power can cause bus noise and memory memory corruption.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat is the typical logic power dissipation of the circuit card?\u003c\/p\u003e\n\u003cp\u003eThe module consumes approximately 2 W of continuous power during standard processing operations.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHow is error correction handled on the internal RAM array?\u003c\/p\u003e\n\u003cp\u003eIntegrated error-correcting memory logic detects and corrects single-bit memory faults during active read-write operations.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat thermal limits must be maintained inside the chassis panel?\u003c\/p\u003e\n\u003cp\u003eThe operating environment surrounding the module must remain strictly within 0 to +60 deg C.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat word size does the 1775-MED module support?\u003c\/p\u003e\n\u003cp\u003eThe memory architecture uses a standardized 16-bit word length structure for addressing.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHow does the module interact with host processor microcode?\u003c\/p\u003e\n\u003cp\u003eThe hardware maintains backplane timing alignment and firmware flash compatibility across host controller processors.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":46066446041261,"sku":"1775-MED","price":88.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/1613\/9181\/files\/allen-bradley_1775-med_1.jpg?v=1786072914","url":"https:\/\/www.maxwellplc.com\/ga\/products\/1775-med-allen-bradley-plc-3-series-memory-module","provider":"Maxwell PLC Ltd","version":"1.0","type":"link"}