Redundant Programmable Logic Controller (PLC) CPU unit with conformal coating - Mitsubishi Electric (MELSEC-Q Series (QnU)) - 252Ksteps / 1008KBytes (Program) memory capacity - connection capacity 4096 x I/O points - with USB connector + 9-pin D-Sub female connector (RS-232) - with RS-232 communication capability - Supply voltage 5Vdc (from dedicated Q-series P.S.U.) - Backplane / rack mounting - equivalent to Q25PRHCPUC