Why mapping 140DDI35300 card with %MW word index reverses the bit allocation of input channel.
The numbering of channels of an I/O module usually starts with 1 and counts up to the maximum number of supported channels. The software however starts numbering with a 0 for the least significant bit in a word (LSB). The Quantum I/O modules have their lowest channel mapped to the most significant bit (MSB). This is the reason for reversal of bits. The following figure shows the mapping of I/O channels related to the bits in a word.