NT2140 Ethernet Discrete AC Input Modules from Acromag

NT2140 Ethernet Discrete AC Input Modules from AcromagNT2140 modules offer 6 AC optocoupler inputs for sensing on/off power status plus 2 DC logic I/O. NTE Ethernet models provide a compact network interface to monitor or control discrete device levels. Appending NTX expansion models can interface up to 24 AC discrete inputs on a single IP address.

Applications include monitoring on/off levels of proximity, limit and toggle switches, or push buttons, contact closures and AC voltage power levels for a wide variety of industrial devices.

An isolated RS-485 bus links up to three expansion modules to the Ethernet module with connectors that join along the DIN rail. This internal NT bus distributes power and communication between the modules. Users can mix analog, temperature, and discrete I/O modules across the NT bus. 

Acromag’s i2o? messaging technology allows direct peer-to-peer multicast communication between remote modules without a master controller. 

Features

NT2140 Ethernet Discrete AC Input Modules:

  • Configured over Ethernet with web browser
  • Expandable I/O capacity, up to 64 I/O channels of mixed signal types on one IP address
  • Field-selectable Modbus TCP/IP, EtherNet/IP, or Profinet communication
  • i2o peer-to-peer or multicast communication
  • Dual RJ45 ports enable daisy chain topology
  • Six individually isolated 120/240V AC discrete input channels for AC voltage levels
  • Two bidirectional DC input/output channels for monitor/controlling TTL/0-32V logic levels
  • Tandem DC input/output channels allow loop-back monitoring of outputs
  • LED status indicators for visual troubleshooting
  • OPC-UA, MQTT and RESTful API IIoT support
  • Conditional logic for rule-based I/O operation
  • Advanced *alarm and *data logging functions
  • 1500V isolation between I/O, network, and power
  • Thin 25mm housing with pluggable terminal
  • Wide temperature operation (-40 to 70°C)
  • CE compliant. Hazardous approvals pending

Specifications

NT2140 Ethernet Discrete AC Input Specifications:

  • Ethernet Interface (NTE models only)
    • Communication:
      • Configurable for Modbus TCP/IP, EtherNet/IP, and Profinet.
      • 10/100Mbps data rate, auto-sensing.
    • IP Address:
      • Default 192.168.0.10. Configurable static IP or DHCP.
  • AC Discrete Inputs
    • Input Type: Six individually isolated AC voltage inputs to detect AC voltage levels. Built-in hysteresis provides a sensing threshold for monitoring AC line voltage.
    • Input Signal Voltage Range:
      • 120V AC: 0 to 130VRMS, ±184V DC.
      • 220V AC: 0 to 240VRMS, ±340V DC.
    • Input Signal Threshold – 120V AC
      • Low-to-High threshold: 77V AC, 109V DC, typical.
      • High-to-Low threshold: 77V AC, 107V DC, typical.
    • Input Signal Threshold – 240V AC
      • Low-to-High threshold: 176V AC, 249V DC, typical.
      • High-to-Low threshold: 173V AC, 245V DC, typical.
    • Input Current:
      • NTE2141/NTX2141: 1.1mARMS at 120V AC.
      • NTE2142/NTX2142: 1.7mARMS at 240V AC.
    • Input Response Time: 20ms, typical.
    • Input Overvoltage Protection: Each channel includes a Metal Oxide Varistor (150V or 275V AC) and capacitively couples AC to an optocoupler circuit. Rated continuous input voltage is 130V AC (NT2141) or 240V AC (NT 2142).
  • DC Discrete Inputs
    • Input Type: Two bidirectional discrete I/O channels with active low inputs and tandem open-drain outputs.
    • Input Signal Voltage Range: 0 to +32V DC.
    • Input Current: 150μA, typical at 32V DC.
    • Input Signal Threshold:
      • TTL compatible w/100mV DC with hysteresis included.
      • TTL logic limit - LOW: 0.8V DC max.
      • TTL logic limit – HIGH: 2.0V DC min.
    • Input Resistance:
      • 200K ohms (input only), 10K ohm output pull-up to Exc.
    • Input Response Time: 5ms typical, not including network time.
    • Input Transient Voltage Suppressor: Installed at every I/O point, up to 38V working, 47V breakdown, and 77V clamping.
  • DC Discrete Outputs
    • Output Type: Two bidirectional discrete I/O channels with open-drain outputs and tandem active low inputs.
    • Output “OFF” Voltage Range: 0 to 32V DC.
    • Output “ON” Current Range: 0 to 250mA DC, continuous.
    • Output Rds ON Resistance: 0.8 ohms typical, 1.6 ohms maximum.
    • Protections:
      • Thermal overload shutdown.
      • Over-voltage shutdown.
      • Over-load shutdown.
      • Reverse polarity protection.
    • Output “OFF” Leakage Current: 0.1uA typical, 50uA max (mosfet only, 25°C, 32V). Does not include input bias current.
    • Output Response Time: 5ms typical. Does not include network time.
  • Counters
    • Input Counter: Inputs Inputs (DC DIO channels 1-2) may operate as up/down event counters for signals up to 85 Hz.
    • Counter Preload Value: Each channel can start from 0 to 4,294,967,295.
    • Counter Debounce: 0 to 65,535ms to filter noise or relay chatter.
    • Counter Alarms: Alarms can toggle an output state upon reaching the termination value. Alarm state can auto-reset after the next count or hold/latch until reset.
    • FRAM: 4Kb (4096 bits) non-volatile memory stores counter value.
  • General I/O:
    • Input Update/Conversion Rate: Fresh data available to the network every 10ms.
    • Response Time from an Ethernet command: Less than 5mS, typical.
  • Environmental and Physical
    • Temperature and Humidity
      • Operating: -40 to +70°C (-40 to +158°F).
      • Storage: -40 to +85°C (-40 to +185°F).
      • Relative Humidity: 5 to 95%, non-condensing.
    • Isolation: 1500V AC for 60 seconds and 250V AC or 354V DC continuous between field I/O group, network port group, and input power circuit. This model adds additional AC input Isolation (field i/O input group)
    • Power Supply
      • 10-32V DC SELV power wired to NTE models only.
      • Power to NTX models is via NT bus connection.
      • 4-32V field excitation per I/O.
    • Power Consumption
      • NTE2141/2142: 1.92W (AC High).
      • NTX2141/2142: 0.42W (AC High).
    • Dimensions (width x height x depth)
      • NTE: 25 x 116.9 x 139.2 mm (0.98 x 4.6 x 5.48 inches).
      • NTX: 25 x 116.9 x 116.65 mm (0.98 x 4.6 x 4.59 inches).
    • Weight
      • NTE: 0.5 lbs (0.23 kg).
      • NTX: 0.3 lbs (0.14 kg).
  • Standards and Certifications
    • Electromagnetic Compatibility (EMC): CE marked, per EMC Directive 2004/108/EC.
    • Safety Approvals: Hazardous approvals pending.

Q & A

Q&A Section with Expand/Collapse Icons

NT2140 Ethernet Discrete AC Input Q & A

+ What I/O functionality does the NT2140 provide?
It offers 6 opto-isolated AC inputs (120 V or 240 V) and 2 bidirectional DC logic I/O channels for TTL or 0–32 V logic.
+ How many total I/O channels are achievable?
Up to 24 AC inputs can be supported by connecting NTX expansion modules, all under a single IP.
+ What network and communication protocols are supported?
Field-selectable support for Modbus TCP/IP, EtherNet/IP, PROFINET plus IoT-enabled options like OPC UA, MQTT, and RESTful API.
+ Can multiple devices be daisy-chained?
Yes — dual RJ-45 ports allow daisy-chain network topology.
+ How is the module configured?

Configuration is done through an embedded web interface—no software install needed.

Downloads

Download Acromag NT2140 Ethernet Discrete AC Input Modules Datasheet

 

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