SIMATIC S7, Digital input SM 326, F-DI 24x24 V DC, Fail-safe digital input for SIMATIC S7 F-systems with diagnostic alarm, up to Category 4 (EN 954-1)/ SIL3 (IEC61508)/PLE (ISO13849), 1x 40-pole
6ES7521-1BH00-0AB0 simatic s7-1500, digital input module di16 x dc24v, 16 channels in groups of 16; input delay 0.05 ... 20ms; input type 3 (iec 61131); diagnosis