{"product_id":"novus-digirail-2a-analogue-input-module-modbus-rs485","title":"Novus DigiRail-2A | 2 Channel Analogue Input To RS485 Modbus RTU Module (TC, Pt100, mA, V)","description":"\u003cp\u003eThe \u003cstrong\u003eNovus DigiRail-2A\u003c\/strong\u003e (8811100001) turns two analogue sensor signals into Modbus RTU registers on an RS485 network. Each universal input accepts thermocouples, Pt100 RTDs, mV, V or mA, with cold junction compensation, 3-wire Pt100 lead compensation and sensor break detection built in. Temperatures and process signals can then be read directly by a PLC, HMI, SCADA system or data logger acting as Modbus master, without a separate transmitter and analogue input card.\u003c\/p\u003e\n\u003cp\u003eInputs are isolated from the power and communication circuits (1000Vac), which removes ground loops between sensors and the RS485 network and keeps readings stable in electrically noisy panels. With 17-bit resolution and ±0.15% accuracy on Pt100 and process signals, it is one of the most economical ways to add precise analogue inputs to an existing Modbus system. Address, baud rate and input types are set with free DigiConfig software.\u003c\/p\u003e\n\u003ch3\u003eHow It Fits Your System\u003c\/h3\u003e\n\u003cp\u003eSensors wire to the DigiRail-2A on the DIN rail, and a 2-wire RS485 cable links it to your Modbus master. To read it from a PC or laptop, use the \u003cstrong\u003e\u003ca href=\"https:\/\/www.production-automation.co.uk\/products\/usb-i485-usb-converter-to-dual-rs485-isolated-ports\" style=\"color: #0000ff; font-weight:bold;\"\u003eNovus USB-i485 converter\u003c\/a\u003e\u003c\/strong\u003e. If you need Ethernet (Modbus TCP), analogue outputs or digital I\/O as well, see the \u003cstrong\u003e\u003ca href=\"https:\/\/www.production-automation.co.uk\/products\/novus-digirail-connect-ramix-ethernet-io-module-2ai-2ao-4di-3do\" style=\"color: #0000ff; font-weight:bold;\"\u003eDigiRail Connect RAMIX\u003c\/a\u003e\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e✅ \u003cstrong\u003e\u003ca href=\"\/pages\/warranty\" style=\"color: #0000ff; font-weight:bold;\"\u003e3 Year Manufacturer Warranty\u003c\/a\u003e\u003c\/strong\u003e — backed by our UK-based technical support\u003c\/p\u003e\n\u003ch3\u003eTechnical Details\u003c\/h3\u003e\n\u003cp\u003eOrder code: 8811100001 (DigiRail-2A)\u003c\/p\u003e\n\u003cp\u003eAnalogue inputs: 2, universal, programmable for thermocouple J, K, T, E, N, R, S, B; Pt100; mV; V; mA\u003c\/p\u003e\n\u003cp\u003eResolution: 17 bits\u003c\/p\u003e\n\u003cp\u003eAccuracy (@25°C): Pt100, mV, V, mA ±0.15% of full scale; thermocouples ±0.25% of full scale\u003c\/p\u003e\n\u003cp\u003eSampling rate (1 input): 10Hz for mV, V and mA; 5Hz for thermocouples and Pt100\u003c\/p\u003e\n\u003cp\u003eCold junction compensation: 1°C at 25°C, ±0.05°C\/°C. Pt100 3-wire lead compensation\u003c\/p\u003e\n\u003cp\u003eSensor break detection: thermocouples, Pt100 and mV\u003c\/p\u003e\n\u003cp\u003eTemperature effect: 0.003% of full scale\/°C\u003c\/p\u003e\n\u003cp\u003eIsolation: 1000Vac between inputs and power\/communication\u003c\/p\u003e\n\u003cp\u003eCommunication: 2-wire RS485, Modbus RTU slave, configurable address and baud rate (1,200 to 115,200bps)\u003c\/p\u003e\n\u003cp\u003eIndicators: LEDs for communication and status, key to reset communication parameters to factory default\u003c\/p\u003e\n\u003cp\u003ePower supply: 10-35 Vdc, 50mA max\u003c\/p\u003e\n\u003cp\u003eConfiguration software: DigiConfig (free Windows download)\u003c\/p\u003e\n\u003cp\u003eDimensions: 72 x 78 x 19mm. Mounting: 35mm DIN rail. Working temperature: 0 to 70°C\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat signals can the DigiRail-2A read?\u003c\/strong\u003e\u003cbr\u003eEach of the two inputs can be set independently for a thermocouple (J, K, T, E, N, R, S or B), a Pt100 RTD, or a mV, V or mA process signal, so one module can read a temperature sensor and a 4-20mA transmitter side by side.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat do I need to read the values?\u003c\/strong\u003e\u003cbr\u003eA Modbus RTU master on RS485, such as a PLC, HMI, SCADA system or data logger. The DigiRail-2A is a slave, so it responds to register reads from the master.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I put several modules on one RS485 network?\u003c\/strong\u003e\u003cbr\u003eYes. Each module has its own configurable Modbus address, so several can share one 2-wire RS485 bus alongside other Modbus instruments.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhen should I choose DigiRail Connect instead?\u003c\/strong\u003e\u003cbr\u003eChoose DigiRail Connect RAMIX if you need Ethernet (Modbus TCP), analogue outputs or digital I\/O in the same module. For analogue inputs on RS485 only, the DigiRail-2A is the simpler, lower-cost option.\u003c\/p\u003e\n\u003ch3\u003eIndustry Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature monitoring\u003c\/strong\u003e — brings oven, kiln, tank and process temperatures into SCADA or a data logger.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePLC analogue expansion\u003c\/strong\u003e — adds isolated analogue inputs to a PLC with spare RS485 instead of buying an analogue card.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHVAC \u0026amp; BMS\u003c\/strong\u003e — integrates duct, water and pressure sensor signals onto a Modbus building network.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What signals can the DigiRail-2A read?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Each of the two inputs can be set independently for a thermocouple (J, K, T, E, N, R, S or B), a Pt100 RTD, or a mV, V or mA process signal, so one module can read a temperature sensor and a 4-20mA transmitter side by side.\"}},{\"@type\":\"Question\",\"name\":\"What do I need to read the values?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A Modbus RTU master on RS485, such as a PLC, HMI, SCADA system or data logger. The DigiRail-2A is a slave, so it responds to register reads from the master.\"}},{\"@type\":\"Question\",\"name\":\"Can I put several modules on one RS485 network?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. Each module has its own configurable Modbus address, so several can share one 2-wire RS485 bus alongside other Modbus instruments.\"}},{\"@type\":\"Question\",\"name\":\"When should I choose DigiRail Connect instead?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Choose DigiRail Connect RAMIX if you need Ethernet (Modbus TCP), analogue outputs or digital I\/O in the same module. For analogue inputs on RS485 only, the DigiRail-2A is the simpler, lower-cost option.\"}}]}\n\u003c\/script\u003e","brand":"Novus","offers":[{"title":"Default Title","offer_id":44540089172138,"sku":"8811100001","price":92.7,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0501\/5794\/5002\/products\/DigiRail_2A.png?v=1679810867","url":"https:\/\/www.production-automation.co.uk\/products\/novus-digirail-2a-analogue-input-module-modbus-rs485","provider":"Production Automation","version":"1.0","type":"link"}