Expansion Module Dimensions W x H x D: 71.2 x 80 x 62 mm Inputs: 8 Digital Inputs, abbreviated: 8 DI Outputs: 8 Relay Outputs, abbreviated: 8 RO Module: EM 223 Operating voltage: 24 VDC Series: S7-200 No. of digital inputs: 8 No. of relay outputs: 8