Uss_Port Instruction - Siemens SIMATIC S7 System Manual
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12.4.3
USS_PORT instruction
Table 12- 38 USS_PORT instruction
LAD / FBD
Table 12- 39 Data types for the parameters
Parameter and type
PORT
IN
BAUD
IN
USS_DB
INOUT
ERROR
OUT
STATUS
OUT
Typically, there is only one USS_PORT instruction per PtP communication port in the
program, and each call of this function handles a transmission to or from a single drive. All
USS functions associated with one USS network and PtP communication port must use the
same instance DB.
Your program must execute the USS_PORT instruction often enough to prevent drive
timeouts. USS_PORT is usually called from a cyclic interrupt OB to prevent drive timeouts
and keep the most recent USS data updates available for USS_DRV calls.
S7-1200 Programmable controller
System Manual, 11/2011, A5E02486680-05
SCL
USS_PORT(
PORT:=_uint_in_,
BAUD:=_dint_in_,
ERROR=>_bool_out_,
STATUS=>_word_out_,
USS_DB:=_fbtref_inout_);
Data type
Description
Port
After you install and configure a CM or CB communication device, the
port identifier appears in the parameter helper drop-list available at the
PORT box connection. The assigned CM or CB port value is the device
configuration property "hardware identifier". The port symbolic name is
assigned in the "System constants" tab of the PLC tag table.
DInt
The baud rate used for USS communication.
USS_BASE
The name of the instance DB that is created and initialized when a
USS_DRV instruction is placed in your program.
Bool
When true, this output indicates that an error has occurred and the
STATUS output is valid.
Word
The status value of the request indicates the result of the scan or
initialization. Additional information is available in the
"USS_Extended_Error" variable for some status codes.
105BCommunication processor
12.4 Universal serial interface (USS) communication
Description
The USS_PORT instruction handles communication
over a USS network.
573
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