Smart SoftPLC’s are versatile Programmable Automation Controllers (PACs). All features of the SoftPLC Runtime Control Software are included. Virtually unlimited memory capacity for program logic & data table, data logging, recipes, etc. Plenty of communication ports with configurable drivers and I/O interface options make Smart SoftPLC’s perfect for a wide range of control applications, as well as performing communication gateway (protocol conversion) functions.

  • (4) port GB Ethernet switch/router + (1) stand-alone GB Ethernet port
  • (1) RS-485 port
  • (3) option ports for factory-added interfaces for protocols such as A-B DH+, A-B RIO, RS-485 and others
  • (2) USB 2.0 host ports, one w/ OTG support
  • Extensive ladder logic capability for control, computations/data manipulation, and more
  • Supports up to 16 simultaneously active user-selectable Ethernet/serial/proprietary protocols
  • 512MB RAM user memory for virtually unlimited logic and up to 100M words data registers
  • 8GB on-board flash for application, web pages and data logging
  • Internal MicroSD slot for removable flash (eg: data logging)
  • Alarm notification via email/text message, reports/logs can be sent via email attachments (option)
  • Embedded web server with read/write data ability (option)
  • 802.11 b/g/h WiFi interface (option)
Ordering Information

Smart SoftPLC uses TOPDOC NexGen software for programming, configuration and troubleshooting. A free TOPDOC NexGen license is included with your first SoftPLC purchase, see the Offers Tab.

  • Specify the communication capacity using RT Size (RT Size button describes the options).
  • If you want to use Tealware local I/O, select a TW Interface
  • There are 3 Option Ports.  For A-B Data Highway Plus (DH+) or Remote I/O (RIO), or additional RS-485 ports, specify the mix you desire.
  • Select factory installed Hardware OptionsWiFi or Extended Temperature.
  • Select Firmware Options you want installed – Web Server or Email.

Options:  Your selections are appended to the part number (SKU), separated by dashes in the order listed below (if applicable).

RT Size: LT, 1K, 2K, 8K
TW Interface: None, LP, BP3
Smart Option Ports: None, BH-None-None, BH-BH-None, BH-BH-BH, BH-485-None, BH-BH-485, BH-485-485, 485-None-None, 485-485-None, 485-485-485
Hardware Options: No HW Options, WiFi Support, Ext Temp, WiFi + Ext Temp
Firmware Add-ons: No FW Add-ons, Web Server, Send Email, Web Server & Email
Weight: 2 lbs
Dimensions: 3 × 8 × 3 in
  • A-B PLC Upgrade Incentive OfferFree programming/configuration software with your company’s first purchase of a SoftPLC PAC or Gateway! Simply add TOPDOC NexGen to your cart, and use coupon code “FreeTDNG” at checkout.
  • With your 1st purchase of TOPDOC PLC-2, PLC-5 or PLC-3, receive a $1000 discount on a new Smart or NeoPAC SoftPLC controller or Gateway.  Simply add your selected Smart/NeoPAC to your cart, and use coupon code “ABPLCUpgrade” at checkout.  (Free TOPDOC NexGen offer above also applies!)



SMS4: Smart SoftPLC

Smart SoftPLC CPU

Product Specifications Data Sheet | More info…


About RT Size

RT Size is a SoftPLC license setting that determines communication driver maximums.  RT Size only applies if you are using:

  • ModbusTCP Master:  # of Server Connections
  • Ethernet/IP:  # of Connection Bytes
  • A-B DH+/RIO:  # of Logical Racks
  • Tealware Local I/O: # of Discrete I/O (largest of 2 values)
Which RT Size should I choose?  

Select Lite (LT) if you are not using the protocols above. Use the table below to determine the RT Size needed for your application.

RT Size MBTCP Enet/IP  A-B Racks I/O
LT 2 64  1 128
1K 16 512  8 1024
2K 32 1024 16 2048
8K 127 4096 64 8192
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