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.

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.
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
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 www.fiberopticlink.com for warranty information and coverage details
Product Information
CAD Files
SM4-IO-DR-1
SM4-IO-24-1
SM4-IO-48-1
For product questions, volume pricing and/or delivery outside of the US and Canada, please contact sales.
Ordering
Smart 4 I/O
Short description | Part number | Price | |
---|---|---|---|
Smart I/O 4, 4 Digital Inputs (Dry), 4 Digital Outputs, Powered by 12-48VDC | SM4-IO-DR-1 | $650.00 | |
Smart I/O 4, 4 Digital Inputs (Wet 12-24V), 4 Digital Outputs, Powered by 12-48VDC | SM4-IO-24-1 | $650.00 | |
Smart I/O 4, 4 Digital Inputs (Wet 24-48V), 4 Digital Outputs, Powered by 12-48VDC | SM4-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.
You May Also Be Interested In
You may also like…
*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