There was a download of PLCSimulator 8.20 on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. PLCSimulator belongs to Development Tools.
We cannot guarantee that the program is safe to download as it will be downloaded from the developer's website. Before launching the program, check it with any free antivirus software. The actual developer of the program is Conrad Braam. The program's installer files are generally known as PLCSimulator.exe or projPLC.exe etc. The most popular version of the program is 8.2.
From the developer:
This simulator was originally created around 1999 to allow testing of a driver for a Texas Instruments 500 series controller which I had limited access to while writing the driver. A year latter I re-wrote it to support modbus RTU and TCP, basically because the simulator had allowed me not only to learn the role of master, but also of slave.
You may want to check out more software, such as Simple SQL Copy, Dive Tables Creator or JaySQL, which might be related to PLCSimulator.