{"product_id":"prosoft-technology-mvi71-mcm-modbus-communication-module","title":"ProSoft Technology MVI71-MCM Modbus Communication Module","description":"\u003cp\u003eConfigured for bi-directional serial data transfer in Allen-Bradley PLC-5 systems, the \u003cstrong\u003eProSoft Technology MVI71-MCM\u003c\/strong\u003e (\u003cstrong\u003eMVI71-MCM\u003c\/strong\u003e Modbus Communication Module) provides direct physical\/electrical execution of Modbus RTU and ASCII protocol conversion across single-slot 1771 I\/O chassis platforms.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\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\u003eMVI71-MCM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eProSoft Technology\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\u003e0.73 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to 60 deg C (32 to 140 deg F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eBackplane Load: 800 mA @ 5 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Compatibility\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley PLC-5 System (1771 I\/O Rack)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSerial Ports\u003c\/td\u003e\n\u003ctd\u003e2 x RS-232 \/ RS-422 \/ RS-485 configurable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported Protocols\u003c\/td\u003e\n\u003ctd\u003eModbus RTU \/ Modbus ASCII (Master or Slave per port)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBaud Rates\u003c\/td\u003e\n\u003ctd\u003e110 bps to 115.2 kbps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eData Transfer Method\u003c\/td\u003e\n\u003ctd\u003eBlock Transfer Read\/Write (BTR\/BTW) via Ladder Logic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd\u003e-40 to 85 deg C (-40 to 185 deg F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelative Humidity\u003c\/td\u003e\n\u003ctd\u003e5% to 95% (non-condensing)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eProtocol Conversion Latencies \u0026amp; Serial Bus Isolation\u003c\/h3\u003e\n\u003cp\u003eThe MVI71-MCM minimizes protocol conversion latencies through localized buffer management within the single-slot 1771 module footprint. Internal memory maps execute up to 100 Modbus command blocks per port directly to the PLC-5 processor registers via high-speed Block Transfer Read\/Write (BTR\/BTW) cycles. Physical communication interfaces utilize isolated line drivers for RS-232, RS-422, and RS-485 topology configurations, preventing ground loops and transient surge coupling across serial networks up to 115.2 kbps.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How is data synchronized between the MVI71-MCM and the PLC-5 processor backplane?\u003c\/p\u003e\n\u003cp\u003eA: Data transfer relies on standard Block Transfer Read (BTR) and Block Transfer Write (BTW) ladder logic instructions executed within the PLC-5 processor. Internal command blocks map Modbus register space directly into assigned backplane data files.\u003c\/p\u003e\n\u003cp\u003eQ: Can both serial ports on the MVI71-MCM operate under different Modbus configurations simultaneously?\u003c\/p\u003e\n\u003cp\u003eA: Yes, Port 1 and Port 2 are fully independent. Each port can be configured individually for Modbus Master or Slave functionality, running differing baud rates, parity settings, and physical layer standards (RS-232, RS-422, or RS-485).\u003c\/p\u003e\n\u003cp\u003eQ: What is the backplane current draw restriction for installing this module in a 1771 I\/O rack?\u003c\/p\u003e\n\u003cp\u003eA: The module draws up to 800 mA at 5 VDC from the 1771 chassis backplane. Ensure the rack power supply has adequate current margin before inserting the module into an active backplane power group.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003ePower off the target 1771 I\/O chassis before inserting or removing the MVI71-MCM module. Do not perform hot-swapping during active operation.\u003c\/li\u003e\n\u003cli\u003eVerify jumper block configurations on the module circuit board for RS-232, RS-422, or RS-485 operating modes prior to physical rack insertion.\u003c\/li\u003e\n\u003cli\u003eEnsure proper grounding of all shielded serial cable braids to a single-point protective earth (PE) ground to mitigate common-mode EMI noise.\u003c\/li\u003e\n\u003cli\u003eMaintain proper terminal connector torque and enforce standard NPT\/metric cable gland strain relief rules to avoid physical port stressing.\u003c\/li\u003e\n\u003cli\u003eAlign module circuit board edge connectors with the 1771 backplane slot guides and press firmly until locked in place.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"AMPHENOL","offers":[{"title":"Default Title","offer_id":44006260834394,"sku":"MVI71-MCM","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/MVI71-MCM2.jpg?v=1788429051","url":"https:\/\/www.plcmasters.com\/products\/prosoft-technology-mvi71-mcm-modbus-communication-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}