Siemens Simatic S7 Series

Libraries
9.2 USS library instructions
S7-200 SMART
418 System Manual, 09/2015, A5E03822230-AC
Table 9- 5 Format for the Active drive parameter
This figure shows the description and format of
the active drive input
.
Any drive that is marked as
"Active" is automatically polled in the background
to control the drive, collect status, and prevent
serial link time-outs in the drive.
• D0 (Drive 0 active bit):
– 0 - drive not active
– 1 - drive active
• D1 (Drive 1 active bit):
– 0 - drive not active
– 1 - drive active
• ...
Refer to the USS protocol execution error codes (Page 428) to compute the time between
status polls and the error conditions that could result from executing the instruction.
Table 9- 6 USS_INIT example program
Network 1
Network 1
LD SM0.1
CALL USS_INIT, 1, 19200, 1, 16#1, M0.0,
VB1
Refer to "Using the USS protocol instructions" (Page 416) for and a listing of USS protocol
instructions and error codes and example programs.