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PC Based Industrial Automation

Featured Product

This months featured product is the ADAM-4520 RS-232 to RS-485 converter.
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ADAM-4018+ 8 Channel Thermocouple/Analog Input Module with Modbus

Download PDF Download the ADAM-4018+ data sheet.


ADAM-4018+ ModuleThe ADAM-4018+ is a 16-bit, 8-channel thermocouple/analog input module that provides programmable input ranges on all channels. This module is an extremely cost-effective solution for industrial measurement and monitoring applications. Its opto-isolated inputs provide 3000 VDC of isolation between the analog input and the module, protecting the module and peripherals from damage due to high input-line voltages. ADAM-4018+ offers signal conditioning, A/D conversion, ranging and RS-485 digital communication functions. The module protects your equipment from ground loops and power surges by providing optoisolation of A/D input and transformer based isolation up to 3000 VDC. The ADAM-4018+ uses a 16-bit microprocessor-controlled sigma-delta A/D converter to convert sensor voltage or current into digital data. The digital data is then translated into engineering units. When prompted by the host computer, the module sends the data to the host through a standard RS-485 interface.



  • Power Input Unregulated 10 - 30V DC.
  • Connectors 2 x plug-in terminal block (#14 - 22AWG)
  • Watchdog Timer System (1.6 Sec.) and Communication
  • Isolation Voltage 3000VDC
  • Power Consumption 0.8W @ 24 VDC
  • Supported Protocols ASCII command and Modbus/RTU
  • Humidity 5 to 95% RH
  • Operating Temperature -10 to 70°C
  • Storage Temperature -25 to 85°C

Analog Input

  • Channels 8 differential
  • Resolution 16-bit
  • Sampling Rate 10 samples/second (total)
  • Built in TVS/ESD Protection
  • Overvoltage Protection ±35VDC
  • Input ImpedanceVoltage 20 MΩ / Current 125Ω
  • Input Type Thermocouple and mA
  • Independent Range for each Channel Yes
  • Input Ranges
    • Current - ±20mA and 4-20mA
    • Type J - 0-760°C
    • Type K - 0-1370°C
    • Type T - -100-400°C
    • Type E - 0-1000°C
    • Type R - 500-1750°C
    • Type S - 500-1750°C
    • Type B - 500-1800°C
  • Accuracy
    • Voltage Mode ± 0.1% or better
    • Current Mode ± 0.2% or better
    • Span Drift ±25ppm/°C
    • Zero Drift ±6µV/°C
  • Burn-out detection Yes on T/C ranges
  • CMR @ 50/60Hz 120dB
  • NMR @ 50/60Hz 100dB