SM 521 16 x DI 6ES7521-1BH00-0AB0

SIMATIC S7-1500, digital input module DI 16xDC 24V HF, 16 channels in groups of 16; input delay 0.05..20 ms; Input type 3 (IEC 61131); Diagnostics, hardware interrupts: Front connector (screw terminals or push-in) to be ordered separately