{"product_id":"mitsubishi-qj71mb91-communication-module-qj71mb91","title":"Mitsubishi QJ71MB91 COMMUNICATION MODULE QJ71MB91","description":"\u003ch3 data-end=\"18\" data-start=\"0\" data-section-id=\"nq8ynu\"\u003eDescription:\u003c\/h3\u003e\n\u003cp data-end=\"573\" data-start=\"19\"\u003eThe\u003ca href=\"https:\/\/plgautomation.com\/collections\/mitsubishi\"\u003e Mitsubishi\u003c\/a\u003e QJ71MB91 is a Modbus serial communication module designed for the MELSEC-Q series PLC platform, enabling communication between the PLC and external Modbus-compatible devices. It supports both master and slave functionality, allowing integration with third-party equipment such as drives, \u003ca href=\"https:\/\/plgautomation.com\/collections\/hmi-operator-interfaces\"\u003eHMIs\u003c\/a\u003e, sensors, and remote I\/O. Commonly installed in control systems and industrial networks, it is used by maintenance teams and system integrators for system communication, networking, and protocol conversion. \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-end=\"594\" data-start=\"575\" data-section-id=\"plkbhx\"\u003eApplications:\u003c\/h3\u003e\n\u003cp data-end=\"982\" data-start=\"596\"\u003eThe Mitsubishi QJ71MB91 communication module is used in industrial automation systems requiring reliable serial communication and integration with Modbus devices. Typical applications include PLC-to-HMI communication, inverter and drive control, multi-device networking, and integration of third-party field devices where stable Modbus communication and data exchange are critical to system performance.\u003c\/p\u003e\n\u003ch3 data-end=\"1013\" data-start=\"984\" data-section-id=\"5hg6bl\"\u003eTechnical Specifications:\u003c\/h3\u003e\n\u003cp data-end=\"2372\" data-start=\"1015\"\u003e• Manufacturer Part Number (MPN): QJ71MB91\u003cbr data-end=\"1060\" data-start=\"1057\"\u003e• Product Type: Modbus Communication Module\u003cbr data-end=\"1106\" data-start=\"1103\"\u003e• Series: MELSEC-Q\u003cbr data-end=\"1127\" data-start=\"1124\"\u003e• Communication Protocol: Modbus RTU \/ Modbus ASCII \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003cbr data-end=\"1219\" data-start=\"1216\"\u003e• Communication Modes: Master and Slave \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003cbr data-end=\"1299\" data-start=\"1296\"\u003e• Interfaces:\u003cbr data-end=\"1315\" data-start=\"1312\"\u003e• RS-232: 1 channel\u003cbr data-end=\"1339\" data-start=\"1336\"\u003e• RS-422\/485: 1 channel \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003cbr data-end=\"1405\" data-start=\"1402\"\u003e• Communication Speed: 300 bps to 115200 bps \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003cbr data-end=\"1490\" data-start=\"1487\"\u003e• Max Transmission Distance:\u003cbr data-end=\"1521\" data-start=\"1518\"\u003e• RS-232: up to 15 m\u003cbr data-end=\"1546\" data-start=\"1543\"\u003e• RS-422\/485: up to 1200 m \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003cbr data-end=\"1615\" data-start=\"1612\"\u003e• Max Number of Slaves: 32 devices per channel \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003cbr data-end=\"1702\" data-start=\"1699\"\u003e• Data Handling Capacity: Up to 4K words (input\/output) \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003cbr data-end=\"1798\" data-start=\"1795\"\u003e• Modbus Device Points: Up to 64K points per type \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003cbr data-end=\"1888\" data-start=\"1885\"\u003e• I\/O Occupation: 32 points (intelligent module) \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003cbr data-end=\"1977\" data-start=\"1974\"\u003e• Power Supply: 5 VDC (from PLC backplane)\u003cbr data-end=\"2022\" data-start=\"2019\"\u003e• Current Consumption: Approx. 0.31 A \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003cbr data-end=\"2102\" data-start=\"2099\"\u003e• Dimensions: 98 × 27.4 × 90 mm \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003cbr data-end=\"2176\" data-start=\"2173\"\u003e• Weight: Approx. 0.2 kg \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003cbr data-end=\"2243\" data-start=\"2240\"\u003e• Mounting Type: Rack-mounted (Q-series base unit)\u003cbr data-end=\"2296\" data-start=\"2293\"\u003e• Status: Active \/ standard module \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-end=\"2400\" data-start=\"2374\" data-section-id=\"1ln9bp8\"\u003eCommon Replacements:\u003c\/h3\u003e\n\u003cp data-end=\"2565\" data-start=\"2401\"\u003e• Mitsubishi \u003ca href=\"https:\/\/plgautomation.com\/products\/mitsubishi-qj71mt91-communication-module?_pos=1\u0026amp;_sid=c5885f0e1\u0026amp;_ss=r\"\u003eQJ71MT91\u003c\/a\u003e (Modbus TCP version)\u003cbr data-end=\"2446\" data-start=\"2443\"\u003e• Mitsubishi \u003ca href=\"https:\/\/plgautomation.com\/products\/mitsubishi-qj71e71-100-ethernet-module-qj71e71100?_pos=2\u0026amp;_sid=3ab7d4f5b\u0026amp;_ss=r\"\u003eQJ71E71-100\u003c\/a\u003e (Ethernet module alternative)\u003cbr data-end=\"2503\" data-start=\"2500\"\u003e• Mitsubishi FX5-485-BD (for iQ-F platform, not direct swap)\u003c\/p\u003e\n\u003cdiv class=\"relative basis-auto flex-col -mb-(--composer-overlap-px) pb-(--composer-overlap-px) [--composer-overlap-px:28px] grow flex\"\u003e\n\u003cdiv class=\"flex flex-col text-sm pb-25\"\u003e\n\u003csection data-turn=\"assistant\" data-scroll-anchor=\"true\" data-testid=\"conversation-turn-384\" data-turn-id=\"request-69d3c737-6fb8-8332-9a9b-2c1931ab8c51-33\" dir=\"auto\" class=\"text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\"\u003e\n\u003cdiv class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\/main:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\/main:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\"\u003e\n\u003cdiv class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\"\u003e\n\u003cdiv class=\"flex max-w-full flex-col gap-4 grow\"\u003e\n\u003cdiv class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+\u0026amp;]:mt-1\" data-message-model-slug=\"gpt-5-3\" dir=\"auto\" data-turn-start-message=\"true\" data-message-id=\"4473323a-ae92-4c0a-b2fb-668c21946da2\" data-message-author-role=\"assistant\" tabindex=\"0\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert w-full wrap-break-word light markdown-new-styling\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Mitsubishi","offers":[{"title":"New","offer_id":50558406787374,"sku":"New","price":309.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0818\/1038\/files\/Mitsubishi_QJ71MB91_A1433_1.jpg?v=1752046647","url":"https:\/\/plgautomation.com\/products\/mitsubishi-qj71mb91-communication-module-qj71mb91","provider":"PLG Automation ","version":"1.0","type":"link"}