Category archives: Communication

Ethernet communication, routers/switches, firewalls, modems.

TOPDOC NexGen Update - Required for new SoftPLC's

Last update on July 11, 2016.

Due to a conflict with Ethernet/IP communications, we have changed the "Detect on Net" function to use a different Ethernet port.

TOPDOC NexGen version 1.6.160608 or later is required to successfully use the "Detect on Net" function with both older SoftPLC's and with SoftPLC's version 4.6.160608 and later.

Contact for details on updating your TOPDOC NexGen.

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Modbus ASCII added to SoftPLC Master & Slave Drivers

Last update on July 5, 2016.

We've enhanced our Modbus Serial Master (MODBMAST.TLM) and Modbus Serial Slave (MODBSLAV.TLM) drivers for SoftPLC to now also support Modbus ASCII, as well as Modbus RTU.

Details can be found in the user manuals at the links above, or by contacting SoftPLC.

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December 2012 Newsletter Posted

Last update on Sept. 5, 2015.

  • SoftPLC's Smart Product Line includes multiple functions
  • Holiday Closure Notice

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SoftLC now supports DHCP address assignments

Last update on Sept. 5, 2015.

SoftPLC’s networking now can support DHCP as an alternative to BOOTP and static IP addresses.

To use a DHCP client on any SoftPLC ethernet interface, just have the line in NETWORK.LST say:


That’s it!  The DHCP server should establish the GATEWAY and the DNS settings, the values in NETWORK.LST will be ignored if DHCP is set for an interface.

This support is for SoftPLC versions 4.6 and later.  Contact technical support ( for more information.

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