EX-RC1 is a remote I/O module that communicates between Vision PLC`s through UniCan protocol.
UniCan is a propetary protocol of Unitronics that runs under CANBus.
To transfer data to/from the PLC and the EX-RC1 you need to write a small logic to send the data with a vector.
Attached an example for the PLC and EX-RC1.
EX-RC1_new.vlp
V570_CAN Master for EX-RC1.vlp