SoftPLC.
The software PLC is a straightforward software solution that is executed in a Windows environment. The software PLC is executed in the same manner as a hardware PLC.
The advantage of executing a PLC program in this manner is that the PLC status can be displayed in real time without any recompile activities.
Diagnostics and testing of a PLC program is much easier and the instructions to be executed can be monitored in real time. Single blocks can be transferred directly into the PLC within a PC.

S5.
S5 for Windows is an excellent software tool for creating, modifying, testing, and documenting programs for Programmable Logic Controllers (PLC). S5 for Windows is used to program the Siemens PLC family SIMATIC® S5 with the programming language STEP® 5.
As with S5 for Windows, PLC logic can be written and displayed in either Ladder, Statement List (STL), Control System Flowchart (CSF) or Graphical Step Sequence (with the optional G5 for Windows package). fully compliant with windows 95/98/2000/XP

S5-S7 Simulation.
Optionally, an additional S7 PLC simulation package is available. The SimPLC PLC416 is a software simulation PLC with the functionality and the instruction set of a Simatic® S7 CPU 416.
The Simulation PLC can be installed on the same computer where you have installed the S7 for Windows® software package which will allow you to transfer data directly between S7 for Windows® and the Simulation PLC's.
It is also possible to have the S7 Simulation PLC installed on a separate computer and transfer data between S7 for Windows® and the S7 Simulation PLC via a serial link between the two computers using a null-modem cable

S7.
S7 is an efficient and straightforward programming system for the Siemens Simatic S7-300 and S7-400 PLC's. Dickinson now offers S7 for Windows as an upgrade to the S5 for Windows programming system or as a complete stand alone programming package.
In the Statement List (STL) presentation the complete instruction sets of the S7-300 and S7-400 PLC are implemented in the S7 for Windows programming package. It is also possible to use the Ladder Logic (LAD) or the Control System Flowchart (CSF) to program and display the Status of the networks. fully compliant with Windows 95/98/2000/XP

About IBH.
IBH softec develop software and hardware for Siemens Programmable controllers. Their products include PLC programming software, software PLC's, Simulation PLC's, Network Gateways, OPC Servers, and EEPROM Programmers. Dickinson are exclusive distributors for IBH in the region