Siemens Simatic S7 Series System Manual

Libraries
9.2 USS library instructions
S7-200 SMART
System Manual, 09/2015, A5E03822230-AC
425
9.2.2.5
USS_WPM_x instruction
Table 9- 14 USS_WPM_x instructions
LAD / FBD
STL
Description
CALL USS_WPM_W, XMT_REQ, EEPROM,
Drive, Param, Index, Value,
DB_Ptr, Done, Error
CALL USS_WPM_D, XMT_REQ, EEPROM,
Drive, Param, Index, Value,
DB_Ptr, Done, Error
CALL USS_WPM_R, XMT_REQ, EEPROM,
Drive, Param, Index, Value,
DB_Ptr, Done, Error
There are three write instructions for the USS protocol:
• USS_WPM_W instruction writes an unsigned word
parameter.
• USS_WPM_D instruction writes an unsigned dou-
ble word parameter.
• USS_WPM_R instruction writes a floating-point
parameter.
Only one read (USS_RPM_x) or write (USS_WPM_x)
instruction can be active at a time.
The USS_WPM_x transactions complete when the drive acknowledges receipt of the
command or when an error condition is posted. The logic scan continues to execute while
this process awaits a response.
Table 9- 15 Valid operands for the USS_WPM_x instructions
Inputs/outputs
Data type
Operands
XMT_REQ
BOOL
I, Q, M, S,SM,T,C,V,L, Power Flow conditioned by a rising edge detection element
EEPROM
BOOL
I, Q, M, S, SM, T, C, V, L, Power Flow
Drive
BYTE
VB, IB, QB, MB, SB, SMB, LB, AC, *VD, *AC, *LD, Constant
Param, Index
WORD
VW, IW, QW, MW, SW, SMW, LW, T, C, AC, AIW, *VD, *AC, *LD, Constant
DB_Ptr
DWORD
&VB
Value WORD
DWORD, REAL
VW, IW, QW, MW, SW, SMW, LW, T, C, AC, AQW, *VD, *AC, *LD
VD, ID, QD, MD, SD, SMD, LD, *VD, *AC, *LD
Done
BOOL
I, Q, M, S, SM, T, C, V, L
Error
BYTE
VB, IB, QB, MB, SB, SMB, LB, AC. *VD, *AC, *LD

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.