RFID SLICE RFID-S slice for BL20 modular I/O system contains two channels. Additional RFID slices, as well as traditional discrete and analog I/O slices, can be combined on the same network node without special software for integration into a PLC system. Designed with digitized communication, it allows a 50 m separation between the transceiver and slice without noise induction, and all RFID channels operate in parallel.