{"product_id":"prosoft-mvi56-mcmr-modbus-reduced-data-block-communication-module","title":"ProSoft MVI56-MCMR Modbus Reduced Data Block Communication Module","description":"\u003ch3\u003eIndustry Application \u0026amp; Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eMVI56-MCMR (MVI56MCMR)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a specialized Modbus Master\/Slave communication module designed specifically for ControlLogix platforms requiring optimized backplane data transfer. In complex industrial environments such as offshore oil platforms, automated power substations, and mineral processing facilities, backplane bandwidth is a premium resource. The\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eMVI56-MCMR\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eaddresses this by utilizing a \"Reduced Data Block\" structure, which allows the module to operate effectively in remote I\/O racks over ControlNet or EtherNet\/IP where large I\/O connections might otherwise fail or cause latency. By ensuring consistent data throughput between Modbus serial devices and the Allen-Bradley processor, this module prevents communication bottlenecks and safeguards critical process uptime.\u003c\/p\u003e\n\u003ch3\u003eHardware Architecture \u0026amp; Protocol Logic\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eMVI56-MCMR\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efeatures two independent serial ports, capable of running different Modbus commands or baud rates simultaneously. Its internal database maps directly to the ControlLogix processor memory, supporting up to 5000 words of data.\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eOptimized Transfer:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe \"MCMR\" designation signifies its ability to interface with the CPU using smaller I\/O blocks (typically 40, 60, or 120 words), making it the standard choice for remote rack installations.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eProtocol Versatility:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eFully supports Modbus RTU and ASCII modes. It provides native handling for floating-point data, essential for flow meters and power analyzers, with specific support for Enron and Daniel implementations.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDual Port Functionality:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eBoth ports operate independently as either a Master or a Slave, allowing the module to act as a data concentrator between legacy field instruments and modern SCADA systems.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Parameters\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eDetail\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eMVI56-MCMR\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eProSoft Technology\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eUSA\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBackplane Current\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e800 mA @ 5 VDC; 3 mA @ 24 VDC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0 to 60 deg C\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eStorage Temperature\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e-40 to 85 deg C\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModbus Modes\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eRTU (Binary) and ASCII\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBaud Rate\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e110 to 115,200 baud\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eRelative Humidity\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e5% to 95% (Non-condensing)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eShock \/ Vibration\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e30 g (Operational) \/ 5 g @ 10 to 150 Hz\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eShipping Weight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2.0 kg\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eEssential Maintenance FAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the primary advantage of the MCMR version over the standard MVI56-MCM?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe MCMR version is designed for remote chassis applications. Standard modules often require large I\/O scheduled tags that exceed the capacity of remote bridge links. The MCMR uses smaller, manageable data blocks to ensure stable communication over network bridges.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow does the module handle high-precision flow meter data?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt provides built-in floating-point support. You can configure the module to swap bytes or words to match the requirements of specific instruments like Daniel or Enron flow computers without writing complex ladder logic.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat should I check if the 'ERR' LED is flashing red?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis typically indicates a configuration mismatch or a communication timeout on one of the ports. Verify that the baud rate, parity, and slave IDs in the configuration file exactly match the field devices.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eProfessional Installation \u0026amp; Deployment Guide\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eRemote Rack Considerations:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eWhen installing the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eMVI56-MCMR\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ein a remote chassis, ensure the ControlNet or EtherNet\/IP adapter is configured to support the specific block size defined in the module’s configuration. Mismatched block sizes will result in an I\/O Configuration Error in RSLogix 5000.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSerial Port Protection:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eFor RS-485 multi-drop networks in high-vibration mining or heavy industrial areas, utilize high-quality shielded twisted-pair cable. Always terminate the last node of the network with a 120-ohm resistor to prevent signal reflections that cause intermittent data loss.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCFG Port Usage:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe RJ45 configuration port is RS-232 only. Always use the ProSoft-supplied cable for diagnostics. Do not connect a standard Ethernet cable to this port, as it may cause electrical damage to the communication UART.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003c\/h3\u003e","brand":"ProSoft","offers":[{"title":"Default Title","offer_id":53076256620907,"sku":"MVI56-MCMR","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/mvi56-mcmr-wrggkylvdgs.jpg?v=1775727258","url":"https:\/\/www.plcprotech.com\/products\/prosoft-mvi56-mcmr-modbus-reduced-data-block-communication-module","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}