EZPLC Screw-down I/O base with built-in 10 baseT Ethernet with 32 Bit 40 MHz processor, 96-120 VAC power supply, 64K words total memory, two integrated communication ports for RS232 (Programming and HMI) and RS422/485 (supports ASCII In/Out), Built-in real time clock/Calendar, 3 ms scan time for 1K instructions (typical), and 8 slots for EZIO modules for a total of 64 I/O Max (maximum number of I/O points vary based on the type of EZIO modules used).