Smart SoftPLC Gateway (v4): SMG4


Price: $1600.00

Size (I/O & MBTCP Server & EIP Capacity)

Comm Port Option 1

Comm Port Option 2

Comm Port Option 3

Smart Wireless (internal)

Remote Access Features

Virtual HMI/Remote SQL

CPU Operating Temperature


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Smart Gateway Overview

Multi-protocol gateway, data logger, virtual HMI

A complete solution for industrial data communication and management! Smart Gateways are the most powerful and flexible communication protocol converters, bridges, and data concentrators available.

  • Protocol Bridge - Read/Write data between up to 16 simultaneous networks. Virtually unlimited data capacity.
  • Data Logging - Store time-stamped information in choice of file formats. Store data locally, on a network drive or in the cloud.
  • Alarm Notification - Send email or text messages. Highly customizable alarm triggers and list of recipients.
  • Reporting - Generate text or CSV reports. Send reports or data logs as email attachments, or store on any accessible drive.
  • Remote Access/Control - Embedded web server provides ability to view and change data values/states via web pages.
  • Virtual HMI - Embedded Web Studio runtime provides HMI functions, including sophisticated alarm managment, real-time trending, remote SQL database interface and more.

Smart Gateways are ideal for moving data between equipment controlled by different vendors, providing a path for staged migration from older technology based on proprietary networks to new and ethernet-based systems, or combining data from multiple networks to a single ethernet/cellular channel for data analysis or other high-level systems, plus many other applications.


  • (4) port managed GB Ethernet switch/router, user-configurable protocols
  • (1) stand-alone GB Ethernet port
  • (1) RS-485 port, user-configurable protocols
  • (3) option slots for factory-added internal hardware interfaces for protocols such as A-B DH+, A-B RIO, RS-485 and more
  • (2) USB 2.0 host ports, one w/ OTG support
  • Supports up to 16 simultaneously active user-selectable Ethernet/serial/proprietary protocols to hundreds of I/O products, devices and networks
  • 512MB RAM user memory for virtually unlimited logic and up to 100M words data registers
  • 8GB on-board eMMC flash
  • 802.11 b/g/h WiFi interface (requires optional SPO-WIFIMOD for antenna connector)
  • Supports optional internal cell modem (SM4-CMDM1)
  • internal MicroSD slot for removable flash
  • Extensive logic capability for data concentration, scaling, mapping between networks, and more
  • Alarm notification via email or text message, reports/logs can be sent via email attachments
  • Embedded web server option with read/write data ability
  • Embedded virtual HMI option for operator interface via any web browser, remote SQL database interface, and more (Web Studio runtime)

Ordering Information

  • Note: Smart SoftPLC uses TOPDOC NexGen software for programming, configuration and troubleshooting. A free TOPDOC NexGen license is included with your first Smart SoftPLC purchase!
  • If you want to use Tealware local I/O, specify this above in Local Tealware Interface
  • All Smart SoftPLCs include all supported serial and ethernet protocols as standard, configurable in any mix. If you desire support for Allen-Bradley Data Highway Plus (DH+) or Remote I/O (RIO), or additional RS-485 ports, these must be factory installed - specify them above in Option Ports 1-3.
  • If you want to use the WiFi support, this requires factory installation of an internal antenna extension and connector - specify this above in Wireless Options.
  • If you want the internal cellular modem, this requires factory installation - specify this above in Wireless Options.
  • Select any desired remote access and/or virtual HMI features. If the remote access connection will be other than wired Ethernet, the internal WiFi/cellular or an external modem/interface is required. See above or Modems/Wireless for options, or contact SoftPLC to discuss TagWell cloud-based solutions and approved third-party interfaces.
  • The Size only applies if you are using ModbusTCP Master, Ethernet/IP, local Tealware I/O, A-B RIO or DH+ protocols. Select the Lite (LT) version if you are not using these protocols.

    The Size determines the maximum number of ModbusTCP server connections, Ethernet/IP connection bytes, force-able discrete I/O, and Allen-Bradley logical I/O racks supported (I and O addresses). The table below summarizes the available sizes:
SoftPLC Sizes
Cat No Suffix ModbusTCP Server Connections Ethernet/IP Connection Bytes Input (I) Addresses Output (O) Addresses
LT 2 64 128 - 1 logical rack 128 - 1 logical rack
1K 16 512 1024 - 8 logical racks 1024 - 8 logical racks
2K 32 1024 2048 - 16 logical racks 2048 - 16 logical racks
8K 127 4096 8192 - 64 logical racks 8192 - 64 logical racks

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