• Analog and Digital I/O Modules
  • Modbus/TCP, Ethernet/IP and Profinet
  • IIoT or Peer-to-Peer Communication
  • IF/Then/Else Control Logic
Watch this video to learn more about the features of the BusWorks NT Series

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Expandable Remote I/O

Acromag’s Busworks® NT Series lets you add expansion I/O modules for a high-density, cost-efficient remote I/O solution

Base unit NTE Ethernet models handle the network communication and interface up to 16 analog or digital I/O channels for remote monitoring or control applications. NTX Expansion models provide a cost-effective way to add a mix of I/O signal types under a single IP address.

Multi-protocol support

The NTE Ethernet I/O modules are pre-programmed to support Modbus/TCP, Ethernet/IP* and Profinet* protocols. Just select which is to be used. Modules also support direct i2o® peer-to-peer communication without a master.

  • Integrated I/O expansion bus
  • Up to 64 I/O channels per port
  • Mix analog, digital, and temperature I/O on one port
  • i2o peer-to-peer or multicast communications
  • Rugged design, -40 to 70°C
  • Hazardous location approvals

*coming soon

Certifications/Protocols for the Busworks NT Series Include Modbus TCP/IP, Etherenet/IP, i2O and Profinet

Expand NT Modules Locally

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Daisy Chain NTE Modules Remotely

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Ethernet-based Configuration

Easy setup from anywhere with a web browser

NTE Ethernet I/O modules have a built-in web server for convenient configuration without installing any software. Several web pages lead you through the options to set your IP addresses, protocol, and I/O parameters. A diagnostics page lets you monitor I/O values from your PC, tablet, or smartphone.

Advanced features for IIoT and local control logic functions

The configuration pages will help you quickly setup advanced capabilities such as peer-to-peer communication, conditional logic computation, and
alarm output.

  • Peer-to-peer communication
  • Counter/timers
  • IF/THEN/ELSE logic*
  • Alarm output*
  • RESTful APIs*
  • OPC-UA server*
  • MQTT support*
  • Field-upgradeable

*coming soon

NTE Software Screen: I/O Config

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NTE Software Screen: P2P Config

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NTE Software Screen: Diagnostics

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Common Specifications

Network Communication

Interface: 10/100Mbps Ethernet.
Protocols: Modbus TCP/IP, Ethernet/IP, or Profinet and i2o® peer-to-peer / multi-cast.
IIoT communication: OPC-UA, MQTT, RESTful APIs (pending).
Connectors: Two shielded 8-pin RJ-45 sockets, 10BaseT/100BaseTX.

Approvals and Certifications

CE marked.
UL/cUL Class I; Div. 2; Groups A, B, C, D (pending).
ATEX/IECEx Zone 2 (pending).
EtherNet/IP, Modbus/TCP, Profinet conformance (pending).
Radiated Emissions: BS EN 61000-6-4, CISPR 16.
RFI: BS EN 61000-6-2, IEC 61000-4-3.
Conducted RFI: BS EN 61000-6-2, IEC 61000-4-6.
ESD: BS EN 61000-6-2, IEC 61000-4-2.
EFT: BS EN 61000-6-2, IEC 61000-4-4.
Surge Immunity: BS EN 61000-6-2, IEC 61000-4-5.


Temperature ranges:
Operation: -40 to 70°C (-40 to 158°F).
Storage: -40 to 85°C (-40 to 185°F).
Relative humidity: 5 to 95% non-condensing.
Vibration: 4g, per IEC 60068-2-64.
Shock: 25g, per IEC 60068-2-27.
Isolation: 1500V AC for 60 seconds or 250V AC continuous between I/O, network, and power.
Power requirement: 9 to 32V DC SELV, 2.0W max (83mA maximum @ 24V).


Housing: General purpose plastic enclosure for mounting on 35mm “T-type” DIN rail.
Case Material: Self-extinguishing polyamide, UL94 V-0 rated, general purpose NEMA Type 1.
Circuit Board: Military grade fire-retardant epoxy glass (IPC-4101/98).
I/O Connectors: Removable terminal blocks rated for 12A/250V; AWG #26-12, stranded/solid copper wire.
Dimensions (W x H x D): 25.0 x 116.9 mm (0.98 x 4.6 inches).
NTE: 139.2 mm (5.48 inches).
NTX: 116.65 mm (4.59 inches).
NTE models: 0.5 lbs (0.23 Kg).
NTX models: 0.3 lbs (0.14 Kg).

Busworks NT Series: Physical Dimensions
Busworks NT Series: Back View

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Busworks NT Series Models:

Ethernet I/O Units

  • NTE2111-1111: Dual RJ45 ports, discrete I/O, sinking output, 16-ch
  • NTE2121-1111: Dual RJ45 ports, discrete I/O, sourcing output, 16-ch
  • NTE2131-1111: Dual RJ45 ports, discrete I/O, relay output, 6 MR + 6 DI
  • NTE2211-1111: Dual RJ45 ports, analog input, differential current, 8 AI + 2 DIO
  • NTE2221-1111: Dual RJ45 ports, analog input, single-ended current, 16-ch
  • NTE2231-1111: Dual RJ45 ports, analog input, differential voltage, 8 AI + 2 DIO
  • NTE2241-1111: Dual RJ45 ports, analog input, single-ended voltage, 16-ch
  • NTE2611-1111: Dual RJ45 ports, temperature input, 8 thermocouple + 2 DIO

Expansion I/O Units

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Because We Know I/O

You Get Personalized Support- Guaranteed

You can trust Acromag for all your signal conditioning and remote I/O solutions. You can be confident that with our more than 60 years I/O experience that you will get professional personalized support – guaranteed.

Products Designed for Dependable Value

Acromag’s signal conditioning line features more than 100 transmitters, isolators, alarms, and computation modules. If networked I/O is required, Acromag offers analog, discrete, and temperature I/O modules for Ethernet, Modbus, Profibus, i2o peer-to-peer or multicast communication.

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Modbus TCP/IP, Ethernet I/P, ProfiNet, i2o
BusWorks NT Series