SIPLUS S7-1500 DI 16x110VDC HF TX rail based on 6ES7521-7EH00-0AB0 with conformal coating, -40…+70 °C, OT4 with ST1/2 (+85 °C for 10 minutes), digital input module, 16 channels in groups of 1; input delay 0.05 ... 20 ms input type 3 (IEC 61131); diagnostics, hardware interrupts