CLICK PLC CPU, 4 DC in / 4 sourcing DC out, 2-Ch Analog In / 2-Ch Analog out (current/voltage selectable), requires a 24 VDC power supply, 8K steps program memory, Ladder Logic programming, built-in RS232C programming port and RS232C Modbus/ASCII communications port (configurable up to 115.2K baud) and 3-wire RS485 Modbus/ASCII communications port. Real Time Clock/Calendar and battery backed memory. Discrete Inputs: 4 DC inputs, 24 VDC sink/source, 1 common. Discrete Outputs: 4 DC outputs, 24 VDC sourcing, 0.1A/point, 1 common. Analog Inputs: 2 channels, 4-20 mA, 0-5 VDC. Analog Outputs: 2 channels, 4-20 mA, 0-5 VDC. Removable terminal block included.