SIMATIC S7-1500, SM 521 digital input module DI 32x24 V DC HF,
32 channels in groups of 16; of which 2 inputs as counters can be used;
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.
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