Siemens 6ES7421-1BL01-0AA0 SIMATIC S7-400 SM421 Digital Input

What is BCD?

While it is necessary for PLCs to use binary values, humans often need to see values represented in decimal. As a result, some input and output devices provide a decimal display where each decimal digit corresponds to four PLC binary inputs or outputs. The most common system used by input and output devices of this type is referred to as binary-coded decimal (BCD).
One example of a BCD device is a type of four-digit thumbwheel switch. Each thumbwheel digit controls four PL C inputs. This means that for a fourdigit thumbwheel, 16 inputs are required. Because each thumbwheel digit only needs to represent decimal values from 0 through 9, only ten corresponding binary values are required for each digit.

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6DD3460-0AC0
16135-21-2
6ES7431-0HH00-0AB0
405-8ADC-1
6SE7090-0XX84-0FJ0
6SE7033-7EG84-1JF1
6DD1660-0AE0

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