Your manuals should be able to identify just what that LK 201 does. LK usually indicates link module for remote communications. The LK 201-V1 modules I have seen are for RS-232 communications.
The C200H CPU's are considered obsolete for new projects. Most of the I/O and remote Racks are readily available and non working units can be repaired. The CQM's are a nice updated way to go. If you have a C200H system, the CS1 CPU's can be retrofitted using a new back plane and most of the I/O and RT units work with the CS1 just fine.
For learning purposes, Syswin would be good or try to find an older CX-Programmer disk, like 3.0 or lower. You may be able to get them as they cannot be updated with out getting a complete new version. The newest programer version is 6.0 now.
If you cannot identify any module, post it and I will look it up for you, if some one does not beat me to the punch. I have the master OMRON ID books scattered around my desk and work bench.