I/O system GRT1 I/O Bus Type of module Digital I/O I/O connection type Push-in Connection method 2-wire Number of digital inputs 4 Digital input type AC voltage Permitted voltage at input 170-264 V Number of digital outputs 0 Digital output type None Output current 0 A Short-circuit protected outputs Number of IOV (V+) terminals 0 Number of IOG (V-) terminals 0 Degree of protection (IP) IP20 Product Height (unpacked) 84 mm Product Width (unpacked) 15 mm Product Depth (unpacked) 74.4 mm Product Weight (unpacked) 76 g