{"product_id":"32-channel-rs485-modbus-rtu-plc-io-expansion-board-din35-rail","title":"32-Ch RS485 Modbus RTU PLC IO Expansion Board | DIN35 Rail","description":"\n\u003ch2\u003e32-Channel RS485 Modbus RTU PLC IO Expansion Board with DIN35 Rail Box\u003c\/h2\u003e\n\u003cp\u003eTake full control of your automation projects with this versatile \u003cstrong\u003e32-Channel RS485 Modbus RTU PLC IO Expansion Board\u003c\/strong\u003e. Built around the reliable \u003cstrong\u003eULN2803A Darlington Transistor\u003c\/strong\u003e array, this controller delivers precise, multi-channel output switching for industrial and maker automation systems. Housed in a flame-retardant UM72 DIN35 guide rail enclosure, it installs cleanly on standard DIN35 or C45 rails — ideal for control panels, automation cabinets, and prototyping setups.\u003c\/p\u003e\n\n\u003cp\u003eWhether you're expanding an existing PLC system, building a custom automation controller, or running smart switching sequences, this board gives you 32 independently controlled output channels with a wide operating voltage range and full Modbus RTU protocol support.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Input Voltage:\u003c\/strong\u003e DC 6.5–30V (compatible with 9V, 12V, and 24V systems)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e32 Output Channels\u003c\/strong\u003e driven by ULN2803A Darlington transistors, up to 300mA per channel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e6 Flexible Control Commands:\u003c\/strong\u003e Open, Close, Momentary, Self-locking, Interlock, and Delay (max 255-second delay)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRS485 Communication\u003c\/strong\u003e with full Modbus RTU protocol support — up to 64 devices in parallel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConfigurable Baud Rate:\u003c\/strong\u003e Default 9600 BPS; adjustable to 1200, 2400, 4800, 9600, or 19200 BPS via command\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLow Standby Current:\u003c\/strong\u003e 5mA (all channels closed); 57mA (all channels open)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDIN35 \u0026amp; C45 Rail Mount:\u003c\/strong\u003e UM72 flame-retardant V0-grade enclosure for secure panel installation\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModbus Commands\u003c\/strong\u003e can be entered via serial HyperTerminal or Modbus Poll software\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWorking Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDC 6.5–30V (9V \/ 12V \/ 24V)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStandby Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5mA (all off) \/ 57mA (all on)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax Channel Load\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e300mA per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCommunication Protocol\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRS485, Modbus RTU\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDefault Baud Rate\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e9600 BPS\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax Parallel Devices\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e64\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePCB Board Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100 × 72 × 20 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWith DIN Rail Box Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e120 × 88 × 42 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePCB Weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e65g\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWith DIN Rail Box Weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e144g\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRail Box Model\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUM72 — DIN35 \/ C45 compatible\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInsulation Grade\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFlame-retardant V0\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in China\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's in the Box?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1× DC 12V 32-Channel DIN35 Rail Box RS485 Modbus RTU Controller Board\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHelpful Resources\u003c\/h3\u003e\n\u003cp\u003eFor general electrical safety guidelines relating to low-voltage control equipment, refer to the \u003ca href=\"https:\/\/www.osha.gov\/electrical\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eOSHA Electrical Safety\u003c\/a\u003e resource.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eNote: Due to lighting and monitor differences, the actual color may vary slightly from product images. Please allow ±1–3 cm variance due to manual measurement.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What voltage does the 32-channel RS485 Modbus RTU controller board support?\u003c\/h4\u003e\n\u003cp\u003eA: The board operates on a wide DC input range of 6.5V to 30V, making it compatible with common supply voltages including 9V, 12V, and 24V systems.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How many devices can be connected in parallel using Modbus RTU over RS485?\u003c\/h4\u003e\n\u003cp\u003eA: In Modbus RTU command mode, the controller supports up to 64 devices connected in parallel on a single RS485 bus, making it highly scalable for larger automation systems.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What control commands does this PLC IO expansion board support?\u003c\/h4\u003e\n\u003cp\u003eA: The board supports 6 command types: Open, Close, Momentary, Self-locking, Interlock, and Delay. The Delay command supports a maximum delay duration of 255 seconds per channel.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can I modify the baud rate on this RS485 controller?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The default baud rate is 9600 BPS and can be changed via software command to 1200, 2400, 4800, 9600, or 19200 BPS to match your communication requirements.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What software can I use to send Modbus RTU commands to this board?\u003c\/h4\u003e\n\u003cp\u003eA: Modbus RTU commands can be sent using any serial terminal application such as a Serial HyperTerminal or the popular \"Modbus Poll\" utility, giving you flexible integration options.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What voltage does the 32-channel RS485 Modbus RTU controller board support?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The board operates on a wide DC input range of 6.5V to 30V, making it compatible with common supply voltages including 9V, 12V, and 24V systems.\"}}, {\"@type\": \"Question\", \"name\": \"How many devices can be connected in parallel using Modbus RTU over RS485?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"In Modbus RTU command mode, the controller supports up to 64 devices connected in parallel on a single RS485 bus, making it highly scalable for larger automation systems.\"}}, {\"@type\": \"Question\", \"name\": \"What control commands does this PLC IO expansion board support?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The board supports 6 command types: Open, Close, Momentary, Self-locking, Interlock, and Delay. The Delay command supports a maximum delay duration of 255 seconds per channel.\"}}, {\"@type\": \"Question\", \"name\": \"Can I modify the baud rate on this RS485 controller?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. The default baud rate is 9600 BPS and can be changed via software command to 1200, 2400, 4800, 9600, or 19200 BPS to match your communication requirements.\"}}, {\"@type\": \"Question\", \"name\": \"What software can I use to send Modbus RTU commands to this board?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Modbus RTU commands can be sent using any serial terminal application such as a Serial HyperTerminal or the popular \\\"Modbus Poll\\\" utility, giving you flexible integration options.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/kujrmc-0q.myshopify.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Electronics \u0026 Tech\", \"item\": \"https:\/\/kujrmc-0q.myshopify.com\/collections\/electronics-tech\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"32-Ch RS485 Modbus RTU PLC IO Expansion Board | DIN35 Rail\", \"item\": \"https:\/\/kujrmc-0q.myshopify.com\/products\/32-channel-rs485-modbus-rtu-plc-io-expansion-board-din35-rail\"}]}\u003c\/script\u003e","brand":"Vue","offers":[{"title":"With Din Rail Box","offer_id":48747275026624,"sku":"5:200004763#With Din Rail Box","price":99.99,"currency_code":"USD","in_stock":true},{"title":"Only Board","offer_id":48747275059392,"sku":"5:144170022#Only Board","price":99.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0772\/9338\/7968\/files\/S3eeabf256e664a4c84823d531b67c3e6v.webp?v=1786199226","url":"https:\/\/vueselect.com\/products\/32-channel-rs485-modbus-rtu-plc-io-expansion-board-din35-rail","provider":"Vue","version":"1.0","type":"link"}