Both the Lenze VFD and CLICK PLC are EtherNet/IP Adapters. You would need to add in an EtherNet IP Scanner like a P1000 to communicate to both devices.

I would recommend to go with Modbus with the Click as the Master and Lenze VFD as the slave device.

Definitions below for EtherNet I/P:

Explicit Message Server: An explicit message server responds to request/response oriented communications initiated by explicit message clients. An example of an explicit message server is a bar code reader.

Explicit Message Client: An explicit message client initiates request/response oriented communications with other devices. Message rates and latency requirements are typically not too demanding. Examples of explicit message clients are HMI devices, programming tools, or PC or Linux based applications that gather data from control devices.

I/O Adapter: An I/O adapter receives implicit communication connection requests from an I/O scanner then produces its I/O data at the requested rate. An I/O adapter is also an explicit message server. An I/O adapter can be a simple digital input device, or something more complex such as a modular pneumatic valve system.

I/O Scanner: An I/O scanner initiates implicit communications with I/O adapter devices. A scanner is typically the most complex type of EtherNet/IP device, as it must deal with issues such as configuration of which connections to make, and how to configure the adapter device. Scanners also typically support initiating explicit messages. A programmable controller is an example of an I/O scanner.