{"product_id":"1769-sm2-allen-bradley-dsi-modbus-communication-module","title":"1769-SM2 Allen-Bradley DSI Modbus Communication Module","description":"\u003ch2\u003eAllen-Bradley 1769-SM2 CompactLogix Communication Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1769-SM2 SER A\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1769-SM2\u003c\/strong\u003e Communication Module, operates as a dedicated hardware component for serial data communication transmission within CompactLogix and MicroLogix 1500 controller networks. The device functions as a specialized gateway, converting backplane signals into Drive Serial Interface (DSI) or Modbus RTU protocol sequences. By executing direct physical link handling, the module establishes connectivity between processing units and up to 15 PowerFlex 4-class or 7-class variable frequency drives without requiring external protocol converters or software bridges.\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\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\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1769-SM2 SER A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMexico\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.38 lbs (0.17 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStandard CompactLogix 1769 single-slot module width\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Temp\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-10 to 50 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower Consumption\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e350 mA at 5 VDC, 0 mA at 24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNetwork Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDSI, Modbus RTU\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNumber of Channels\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3 independent serial channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eChannel Connector Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRJ45 connectors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDSI Baud Rate\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFixed at 19,200 bps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModbus Baud Rates\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e300, 600, 1200, 2400, 4800, 9600, 19,200, 38,400 bps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower Supply Distance Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMax 4 modules from power supply\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Modes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSingle Mode (1 drive) and Multi-Drive Mode (up to 5 drives per channel)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eBackplane Bus Communication Velocity and Firmware Flash Compatibility\u003c\/h3\u003e\n\u003cp\u003eThe system bus interfaces directly with the host controller backplane to maintain the overall backplane bus communication velocity needed for deterministic control timing. Electrical execution requires 350 mA at 5 VDC drawn completely from the Compact I\/O power supply rail, leaving the 24 VDC track unused. To prevent communication timeouts and signal attenuation on the local bus, technicians must observe the power supply distance rating, which limits installation to within 4 module slots of the system power source. Network performance dependably aligns with firmware flash compatibility protocols across CompactLogix platforms, enabling operators to flash system updates exclusively via ControlFLASH software over the active 1769 backplane interface.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can this communication module be extracted or replaced while the 1769 backplane is powered?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e No. The module does not support hot-swapping or Removal and Insertion Under Power (RIUP). Breaking the backplane connections while the 5 VDC power supply rail is energized can cause electrical damage to the internal bus transceivers and immediately fault the host controller.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do the network distance limits change based on the drive topology used?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e When connecting to a single drive in Single Mode, the physical cable length is limited to a maximum of 10 m. In Multi-Drive configurations using RS485 distribution techniques, the total combined network length across the daisy-chained layout can reach a maximum limit of 1219 m.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBus Connection and Locking Sequence:\u003c\/strong\u003e Align the side tongue-and-groove tracks to slide the module into the adjacent 1769 slot. Push the upper and lower bus levers forward to complete the physical backplane connections. Both mechanical latches must lock fully into position before applying system power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChassis Mounting and Grounding:\u003c\/strong\u003e Mount the module onto an EN 50022 compliant 35 mm DIN rail, or use two #8 or M4 panhead screws to secure the unit directly to the control panel sub-plate. Maintain proper spacing to accommodate the 3 front-facing RJ45 channel connectors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSerial Cable Shielding and Routing:\u003c\/strong\u003e Route all DSI and Modbus RTU communications through high-quality shielded twisted-pair copper cables (22 to 14 AWG solid or 22 to 16 AWG stranded). Ground the cable shield at a single termination point on the enclosure chassis, keeping communication lines physically isolated from high-voltage AC motor lines to avoid electromagnetic interference.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen Bradley","offers":[{"title":"Default Title","offer_id":44422209044579,"sku":"1769-SM2","price":310.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0583\/5246\/8067\/files\/223_f1731074-2787-4126-9808-fbf82fed1df3.jpg?v=1785372920","url":"https:\/\/www.autocontrolglobal.com\/products\/1769-sm2-allen-bradley-dsi-modbus-communication-module","provider":"AutoControl Global","version":"1.0","type":"link"}