Siemens Simatic S7 Series System Manual

Libraries
9.2 USS library instructions
S7-200 SMART
System Manual, 09/2015, A5E03822230-AC
423
Table 9- 12 USS_RPM_x parameter descriptions
Parameter
Description
XMT_REQ
(transmit re-
quest)
When ON, a USS_RPM_x request is transmitted to the drive on every scan.
Drive Address of the drive to which the USS_RPM_x command is to be sent. Valid ad-
dresses of individual drives are 0 to 31.
Param
Parameter number
Index
Index value of the parameter that is to be read
DB_Ptr The address of a 16-byte buffer must be supplied to the "DB_Ptr" input. This buffer
is used by the USS_RPM_x instruction to store the results of the command issued
to the drive.
Done
Turned on when the USS_RPM_x instruction completes
Error This output byte contains the result of executing the instruction. The USS protocol
execution error codes (Page 428) define the error conditions that could result from
executing the instruction.
Value
Parameter value returned
When the USS_RPM_x instruction completes, the "Done" output is turned on and the "Error"
output byte and the "Value" output contain the results of executing the instruction. The
"Error" and "Value" outputs are not valid until the "Done" output turns on.

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.