Rockwell Automation 160PD1 160 Profibus Communication Module - Manual (Page 37)

Using the 160-PD1 on Profibus 6–11
SLC Ladder Logic Example Profibus scanners vary from manufacturer to manufacturer, in how the
bytes are ordered in a word. The SST-PFB-SLC scanner card receives
/ transmit data with the Most Significant Byte (MSB) first and the
Least Significant Byte (LSB) second. This is opposite to how we read
/ write information in the SLC. This section of program below
reverses the high / low byte order using the SWP instruction.
Figure 6.1
SLC Ladder Logic Example.
SLC Ladder diagram continued on next page