Alpha Xl Base Unit Dimensions W x H x D: 71.2 x 90 x 52 mm Inputs: 6 Digital (Useable by Analogue) Inputs, abbreviated: 6 D/AI Operating temperature: -25...+55 °C Outputs: 4 Relay Outputs, abbreviated: 4 RO Operating voltage: 24 VDC Series: ALPHA Switching capacity: 4 x 8 A Protection rating: IP20 No. of digital inputs: 6 No. of digital inputs, usable by analogue: 6 No. of relay outputs: 4