{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"QJ71MB91","brand":"Mitsubishi Electric","brandSlug":"mitsubishi","productSlug":"QJ71MB91","canonicalUrl":"https://aoctrl.com/mitsubishi/QJ71MB91","factsUrl":"https://aoctrl.com/api/mcp/products/QJ71MB91","rawCanonicalId":null},"summary":{"shortDescription":"Mitsubishi, MODBUS Interface Module, QJ71MB91, RS-232 and RS-422/485, 115200 bps, 32 I/O points.","salesMarkdown":"The Mitsubishi QJ71MB91 is a MODBUS interface module for the MELSEC Q series, providing both RS-232 and RS-422/485 communication at data rates up to 115200 bps. It occupies 32 I/O points and draws 0.31 A from the 5V backplane, leaving plenty of headroom for additional I/O. Master and slave functions are both supported: the master side handles up to 32 slaves per channel via automatic communication (4K word buffers) or dedicated commands (up to 253 bytes per instruction), while the slave side offers 64K-point device sizes for coils, inputs, and registers, plus extended file registers up to 4086 K points. The module accepts one request per channel at a time. With a compact footprint of 9.8 x 2.74 x 9 cm, it fits neatly into the Q-series rack. Typical lead time is 1–10 working days based on current supply channels.","metaTitle":"Mitsubishi QJ71MB91 MODBUS Interface, RS-232/485, 115200 bps","metaDescription":"Mitsubishi QJ71MB91 MODBUS interface module for MELSEC Q series. Supports RS-232 and RS-422/485, speeds up to 115200 bps. Occupies 32 I/O points, draws 0.31 A at 5V. Sourced to ord","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["PLC Communication Modules"],"specifications":{"title":"QJ71MB91","Weight":"0.2","Product No.":"QJ71MB91","description":"Mitsubishi Protocol Module","Product Type":"MODBUS Interface Module","Shipping Weight":"1.5 Kg","lifecycle_stage":"mature","Estimated Lead Time":"Usually ships in 1-10 working days..","Slave function Station number":"1 to 247","Number of occupied I / O points":"32 points (I / O assignment: 32 points of intelligence)","DC 5 V Internal current consumption":"0.31 A","Transmission specification interface":"RS-232 × 1 channel RS-422/485 × 1 channel","External dimensions (H x W x D), approx":"9.8cm x 2.74cm x 9cm","Slave function MODBUS ® device size coil":"64K point","Slave function MODBUS ® device size input":"64K point","Transmission specification Transmission speed":"300 , 600 , 1200 , 2400 , 4800 , 9600 , 14400 , 19200 , 28800 , 38400 , 57600 , 115200 bps · The total transmission speed of the two interfaces can be used within 115,200 bps","Slave function MODBUS ® device size Hold register":"64K point","Slave function MODBUS ® device size Input register":"64K point","Transmission specification Transmission distance RS-232":"Maximum 15 m","Slave function MODBUS ® device size Extended file register":"Up to 4086 K points","Master function Automatic communication function Output area size":"4K words","Slave function Number of simultaneous acceptable request messages":"One request per channel","Master function Communication by dedicated command Output area size":"Up to 253 bytes per instruction","Slave function Automatic response function Function (for reception)":"17 Function","Master function Automatic communication function Area size for input":"4K words","Master function Communication by dedicated command Area size for input":"Up to 253 bytes per instruction","Master function Automatic communication function Function (for transmission)":"7 Function","Master function Automatic communication function Number of communicable slaves":"32 units per channel","Master function Communication by dedicated command Function (for transmission)":"MBRW instruction: 9 function MBREQ instruction: 19 function","Master function Communication by dedicated command Number of concurrently executable instructions":"One instruction per channel"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$305.00 – $843.10","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/4b4cf8be6dfed4f16c0603b0d261546e.pdf","sourceUrl":null},"ai":{"faq":[{"question":"How is the QJ71MB91 typically sourced?","answer":"Quoted to order. Estimated lead time is 1–10 working days through standard distribution."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/mitsubishi/QJ71MB91","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/mitsubishi/QJ71MB91 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}