Most cable manufactures will sell VFD Cable. This is the best option a the VFDs can create a lot of electric noise which can cause communication problems with equipment. I have seen issues with device communications.light curtains, and other equipment just because the proper cable and wiring...
Check out the HMIs from Red Lion Controls. They are inexpensive, easy to use and have communication adapters for almost everything. Tech support has been good to date also.
Giz.