It is the best PLC software I have used for a long time. Programmable function keys, etc etc. Bit daunting at first I guess but that is the same with any PLC software. The auto online feature searches for a connected PLC and gets you online straight away without having to bother with communications settings. Just select your serial port and press the button.
There will not be any documentation when you upload from the processor. The CPM1A does not have that capability. Even processors with the documentation storage facility are often empty. Depends on the programmer as to whether he/she wishes to download symbols etc or not.
Here is a link to the operation manual
http://oeiwcsnts1.omron.com/pdfcatal.nsf/PDFLookupByUniqueID/EB315C85A8C3636886256C91006CB479/$FILE/M11W317E181202.pdf?OpenElement
And the programming manual
http://oeiwcsnts1.omron.com/pdfcatal.nsf/PDFLookupByUniqueID/24A14F54422A782B86256A4100519176/$FILE/M11W353E1041003.pdf?OpenElement
The memory area map is in the programming manual.
You will also require a CPM1-CIF01 communications adaptor and a serial cable. Suggest you buy both from Omron.