PLC with 6 points 24VDC digital input (4@50KHz 2@5KHz) 4 points Transistor PNP output (2@50KHz)/ built-in RS232 communication port/ left side is expandable 0~2 modules/ right side is expandable up to 80 I/O points. Power Supply 24VDC. Standard Size 6 points 24VDC digital input (4 points 50KHz, 2 points total 5KHz), 4 points relay output or transistor output (2 points 50KHz), built-in 1-2 communication ports, left side is expandable 0-2 modules, right side is expandable up to 80 I/O points