The CNXIO-16 features 16 "Versiports" which function as analog inputs, digital inputs, or digital outputs. It installs in any Y-Bus expansion slot of a 2-Series control system.The CNXIO-16 Analog/Digital Input/Output Expansion Card provides 16 analog inputs or digital input/output connections. All pins pull up to +5V. The digital output is rated for 250 mA sync from maximum 24 VDC with catch diodes for use with ‘real world’ loads. The digital input is rated for 0 to 24 VDC. There is a 20K Ohm input impedance; programmable 2K Ohm pullup resistor (per pin, software reference to ground or closure to ground). To enable a 0K pull-up resistor, assign a logic “1” to the corresponding “pu#” pin in the software. The input logic threshold is 1.25 VDC. Analog input is rated for 0 to 10 VDC, protected to 24 VDC, maximum.