SIMATIC S7-400 advanced controller digital input modules

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6ES7421-1BL01-0AA0

32 inputs, 24 V DC

32 inputs, 120 V AC/DC

16 inputs, 120/230 V AC/DC, inputs according to IEC 1131-2 Type 2

16 inputs, 24 V DC, with process/diagnostics interrupt

16 inputs, 24 to 60 V AC/DC, with process/diagnostics interrupt