The ControlLogix Bit Field Distributor (BTD) Allows us to map bits from one word to another. Particularly, when converting 32 bit data to 16 bit data, the BTD makes this very easy. In this case, we have a 32 bit input module. For the purpose of this document, we’ll assume that our SCADA system can only handle 16 bit data. In this case, we’ll take the first 16 bits, and map the data to the Input16a tag. Likewise, we’ll map the last 16 bits to the Input16b tag. We’ve also used this in RFID readers, where the data is in simple 8 bit format, or even on DeviceNet to remap data from a field device so the bits in the word will match up with the labels on the field device.<\/p>