RSTi-OM User Manual
Section 13
GFK-3212A
Jun 2021
Functionality Descriptions
138
Figure 100: SDU Request Message Format-From PLC to IOLM
Write and read ISDU commands that have the same message data format. Each ISDU request
message is comprised of one or more commands. The command(s) can consist of either a series of
nested commands or a single read command.
Note: A list of nested ISDU commands is terminated with either a control field of 0 (single/last
operation) or the end of the message data.