The communication between the BNI ECT-508-105-Z015 and the controlling system is done 
via the EtherCAT.  
The system consists of the following components:  
  Bus master  
  Bus module/slaves (in this case the bus module BNI ECT-508-105-Z015)  
To parameterize the bus master according to type, device data are available to the Bus 
module BNI ECT-508-105-Z015 in the form of three ESI files.  
The data exchange with the controlling system occurs in the input and output buffers.  
The size of these buffers must be configured by the master. 
In the project administration, the Bus module BNI ECT-508-105-Z015 is depicted as a 
modular device. The device data needed for the project planning are stored in the ESI files. 
The data modules of the inputs/outputs of the IO-Link port and possible additional modules 
are shown in the project administration software in relation to slots.  
The ESI files make the possible data modules (inputs/outputs, IO-Link ports of various data 
width and other additional modules) available.  
For the configuration of the BNI ECT-508-105-Z015 the appropriate data modules are 
assigned to a specific slot.  
Unused slots can easily be made available.