Spectrum Controls 1756sc-OF8H Series A - Manual (Page 91)

Chapter 7: HART Channel Configuration, Data, and Status 77
The HART data acquired by the auto acquisition process is copied to the
packet tags by using ladder. The ladder simply copies the data stored in
the (If8h0 or Of8h0)Input.HartDatainput tag., which is multiplexed for the
appropriate packet depending on the state of bits 0, 1, 2 and 8, 9, 10, found
in the first two bytes of the tag. Bits 0, 1, 2 determine the current channel
that is being scanned and bits 8, 9, and 10 determine the appropriate
packet. The ladder example, shown in figure 7.6, buffers the data from
the HartDataInput tag to the correct packets for the IF8H module.
Figure 7.6 (Demultiplexing Ladder)