The docker clips to the rear of the N20K48 and allows up to 8 I/O and comms modules to be fitted.
See below for the full list of ClickNGo Modules:
820KCG11AO Micromodule ClickNGo 1 Analog Output (1 slot)
820KCG12R5 Micromodule ClickNGo 2 Relay Outputs 5 A (2 slots)
820KCG13DI Micromodule ClickNGo 3 Digital Inputs (1 slot)
820KCG13DO Micromodule ClickNGo 3 Digital Outputs (1 slot)
820KCG2485 Micromodule ClickNGo RS485 Interface (1 slot)