Moxa ioLogik E1242 Ethernet Remote IO

Technical Overview

The Moxa ioLogik E1242 is an industrial Ethernet remote I/O module featuring a built-in 2-port Ethernet switch for daisy-chain topologies. Designed for versatile field applications, it integrates 4 analog inputs, 4 digital inputs, and 4 configurable DIO channels. The module bridges the OT/IT divide by concurrently supporting protocols like Modbus TCP, EtherNet/IP, RESTful API, and SNMPv1/v2c, enabling efficient data acquisition and seamless integration into modern SCADA or IIoT systems.

Key Features

Dual-port Ethernet switch allows for simple, cost-effective daisy-chain network topologies
Supports multiple OT/IT protocols: Modbus TCP, EtherNet/IP, RESTful API, SNMP v1/v2c, and MXIO Library
4 differential analog inputs (16-bit resolution) with voltage/current configuration options
4 digital inputs supporting dry/wet contacts and event counter mode up to 250 Hz
4 configurable DIO channels (by jumper) acting as sink outputs or digital inputs
Active push communication technology with Moxa's MX-AOPC UA Server for minimized bandwidth
3 kV VDC or 2 kV Vrms I/O channel-to-system isolation protection
Class I Division 2 and ATEX Zone 2 certifications for hazardous location deployments

Technical Specification Matrix

Parameter	Value
Analog Input Channels	4 differential channels (16-bit resolution, voltage/current modes)
Digital Input Channels	4 channels (dry/wet contact, NPN/PNP)
Configurable DIO Channels	4 channels (sink type digital output or digital input, jumper-selectable)
Ethernet Interface	2 x 10/100BaseT(X) ports (RJ45, built-in switch)
Input Voltage	12 to 36 VDC (24 VDC nominal)
Power Consumption	139 mA @ 24 VDC
Isolation Protection	3k VDC or 2k Vrms
Operating Temperature	-10 to 60°C (14 to 140°F)
Storage Temperature	-40 to 85°C (-40 to 185°F)
Ambient Relative Humidity	5 to 95% (non-condensing)
Housing Material	Plastic
Mounting Options	DIN-rail or Wall mounting
Supported Protocols	Modbus TCP Server, EtherNet/IP Adapter, Moxa AOPC, RESTful API, SNMPv1/v2c

Industrial Applications

1. Municipal Water Storage Level Monitoring

Acquiring precise water level readings from ultrasonic transmitters at remote reservoirs. The 4 analog inputs are configured for 4-20 mA current loop tracking using the built-in 120-ohm resistors, while the 4 digital inputs monitor pump statuses.

Problem Solved

Provides accurate, high-resolution (16-bit) telemetry over long distances back to a SCADA host using Modbus TCP, eliminating intermediate signal converters and local switch requirements via its daisy-chained switch ports.

4-20 mA16-bit ResolutionModbus TCPWater MonitoringDaisy-Chain Switch

2. Hazardous Location Pipeline Telemetry

Deploying distributed telemetry systems along remote oil or natural gas pipeline spans. The unit monitors local pressure gauges via current signals and checks shutoff valve feedback switches.

Problem Solved

Allows direct deployment inside Class I Division 2 and ATEX Zone 2 areas without expensive, bulky flameproof enclosures, while protecting central PLC cabinets from lightning or ground loop faults using 3 kV I/O isolation.

Class I Division 2ATEX Zone 23kV IsolationPipeline Telemetry

3. Assembly Machine OEM Auxiliary I/O Integration

Adding supplementary sensors (e.g., photo-eyes, limit switches, and inductive proximity sensors) to high-speed automation panels, integrating them into the machine's central Ethernet backbone.

Problem Solved

Fits extremely tight control panels due to its slim 27.8 mm width. It bridges real-time PLC networks (EtherNet/IP) and supervisory IT software (RESTful API/SNMP) simultaneously, ensuring zero diagnostic data loss without taxing critical control PLC cycles.

DIN-Rail MountingEtherNet/IPRESTful APIDry ContactMachine Integration