Alpha Xl Base Unit Dimensions W x H x D: 124.4 x 90 x 52 mm Inputs: 15 Digital Inputs, abbreviated: 15 DI Operating temperature: -25...+55 °C Outputs: 9 Relay Outputs, abbreviated: 9 RO Inputs/outputs, max.: 28 I/Os Operating voltage: 115/230 VAC Series: ALPHA Switching capacity: 4 x 8 A, 5 x 2 A Protection rating: IP20 No. of digital inputs: 15 No. of relay outputs: 9