Monitor and Control 4 Digital Inputs & 4 Relay Outputs Over Copper or Fiber Ethernet With Real-Time Alerts

The Smart 4 I/O is an Ethernet I/O controller that interfaces with field devices such as sensors, push buttons, alarms, locks and motors.

Each of the Digital Input and Relay Output channels are configurable through a built-in web management portal, and can be integrated with network management systems, industrial control systems, Internet of Things (IoT) frameworks, and REST-integrated automation platforms.

RLH Smart Series

The Smart 4 I/O supports TLS/SSL encryption, IEEE 802.1X via RADIUS authentication (AAA), role based access control (RBAC), and event logging. The versatile 2-port (1xRJ45, 1xSFP) Ethernet interface offers network access redundancy and segmentation.

It can operate as a standalone unit, independently monitoring and controlling the state of its 4 inputs and 4 relay outputs, or pair with another Smart 4 I/O over a secure TLS/SSL-encrypted tunnel.

This System Pairing feature allows the Smart 4 I/O to transmit I/O bi-directionally across Ethernet between two remote locations.

Compliance

Features

  • 8 independent channels for monitoring and controlling 4 Digital Inputs and 4 Relay Outputs
  • SPDT-style relays simplify Normally Open or Normally Closed relay configuration
  • Optically isolated Digital Input channels that ensure signal integrity and protection against surges
  • Hardened to operate in -40°C to +70°C (-40°F to +158°F)
  • DIN rail or Wall Mount (Wall mount ears included)
  • 12-48VDC and 125VDC models available with redundant power terminals
  • Relay Outputs support up to 3 Amps of current and 60 Watts of power
  • Designed, Engineered, and Assembled in the USA
  • Covered by our Lifetime Warranty
Protocols

Please see the product documentation for the complete list of specifications

Power:
Power Input: 12-48VDC (11-53VDC)
-A powering option: 125VDC (42~160V)
Dual Redundant Power Inputs – Polarity insensitive
Power Consumption: 6 Watts Maximum

DC Input Isolation (In/Out):
1.5kV *For -A power option models only

Overcurrent Protection:
1.0A Automatic Recovery

Operating Temperature:
-40˚C to +70˚C (-40˚F to +158˚F)

Storage Temperature:
-40˚C to +85˚C (-40˚F to +185˚F)

Humidity:
95% non-condensing

Dimensions:
H 4.93” x W 2.0” x D 3.93” (125mm x 51mm x 100mm) – not including DIN clip

Weight:
1.6 lbs. (0.73kg)

Mounting:
Standard T-35 DIN rail clip and wall mount ears (Included)

Compliance:
RoHS and REACH

Warranty:
Lifetime – Visit our warranty page for information and coverage details

Product Information

CAD Files

SM4-IO-DR-1
SM4-IO-24-1
SM4-IO-48-1

$650.00
Lead Time: 1 to 2 Weeks*
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Contact Sales

For product questions, volume pricing and/or delivery outside of the US and Canada, please contact sales.

  • Temperature
  • DIN Mount
  • 4 Inputs
  • 4 Relays
  • Web Interface
  • Ethernet
  • Modbus TCP
  • DNPv3 TCP
  • SNMP
  • RLH Lifetime Warranty
  • Made in USA
  • 35+ Years of Excellence

Ordering

Smart 4 I/O

Short descriptionPart numberPrice
Smart I/O 4, 4 Digital Inputs (Dry), 4 Digital Outputs, Powered by 12-48VDCSM4-IO-DR-1$650.00
- +
Smart I/O 4, 4 Digital Inputs (Wet 12-24V), 4 Digital Outputs, Powered by 12-48VDCSM4-IO-24-1$650.00
- +
Smart I/O 4, 4 Digital Inputs (Wet 24-48V), 4 Digital Outputs, Powered by 12-48VDCSM4-IO-48-1$650.00
- +
  • Add -A to the end of the part number for 125 VDC input power option and get your quote here.

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*Lead times are estimates and may vary. You will be contacted within 1 business day to go over the details of your order. If you require a specific date, let us know!

*Days = Business Days

  • Warning: This product can expose you to chemicals including arsenic, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.
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