Siemens Simatic S7 Series System Manual

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.

Siemens Simatic S7 Series Specifications

General

CPU	Varies by model (e.g., S7-300, S7-400, S7-1200, S7-1500)
Communication Interfaces	PROFIBUS, PROFINET, Ethernet, MPI
Programming	TIA Portal, STEP 7
Programming Languages	LAD, FBD, STL, SCL, GRAPH
I/O Modules	Digital, Analog, Specialty modules available
Operating Temperature	0°C to 60°C (standard models)
Mounting	DIN rail mounting
Operating Voltage	24V DC or 120/230V AC (varies by model)
Protection Class	IP20 (standard models)
Memory	Varies depending on the S7 model. Includes work memory (RAM) for program execution, load memory (EEPROM or Flash) for program storage, and system memory for operating system functions. Memory sizes range from kilobytes to megabytes.