can anybody summerize how to program the PLC and explain what the files .p42 .q42 are? I need to make changes to an existing PLC and believe I need the original source files to make the change as the software cannot be copied out the PLC to a new PC? any help would be great

 

The .P42 file is the compiled project. The .Q42 is the origanl source code. These files were created by an old DOS programming package that was around for about 18 months (now obsolete)before the Moeller released their Windows based S40 software. If you truly have the .Q42 files and the .Z42 files and the .K42 files you have the complete project source files. You can import these files into the current version of Moeller S40 software and the software will convert and recreate the project for you. You can make any changes you need to and then recompile and transfer the program to the PS 4

 

The file with the .P42 extension is he compiled program file. It is the actual file that gets tranferred and run on the PLC. You cannot edit or change this file. The .Q42 file is part of the source code that was created or used in an old DOS based programming softwrae that Moeller had out about 6 or 7 years ago. This file can be read and converted by the new Moeller WIndows Based S40 software. Do you have files with a .K42 and .Z42 extension? These were also part of the original source files but not as important as the .Q42 file. If you have a .Q42 file you are able to edit this file with the Moeler software, then recompile he project and download it to the controller.