Sgn_Get Instruction - Siemens SIMATIC S7 System Manual

12.3.1.8

SGN_GET instruction

Table 12- 28 SGN_GET (Get RS232 signals) instruction
LAD / FBD
STEP 7 automatically creates the DB when you insert the instruction.
1
Table 12- 29 Data types for the parameters
Parameter and type
REQ IN
PORT IN
NDR OUT
ERROR OUT
STATUS OUT
DTR OUT
DSR OUT
RTS OUT
CTS OUT
DCD OUT
RING OUT
Table 12- 30 Condition codes
STATUS (W#16#....)
80F0
S7-1200 Programmable controller
System Manual, 11/2011, A5E02486680-05
SCL
"SGN_GET_DB"(
REQ:=_bool_in_,
PORT:=_uint_in_,
NDR=>_bool_out_,
ERROR=>_bool_out_,
STATUS=>_word_out_,
DTR=>_bool_out_,
DSR=>_bool_out_,
RTS=>_bool_out_,
CTS=>_bool_out_,
DCD=>_bool_out_,
RING=>_bool_out_);
Data type Description
Bool Get RS232 signal state values on the rising edge of this input (Default value:
False)
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.
Bool TRUE for one scan, when new data is ready and the operation is complete
with no errors
Bool TRUE for one scan, after the operation was completed with an error
Word Execution condition code (Default value: 0)
Bool Data terminal ready, module ready (output). Default value: False
Bool Data set ready, communication partner ready (input). Default value: False
Bool Request to send, module ready to send (output). Default value: False
Bool Clear to send, communication partner can receive data (input). Default value:
False
Bool Data carrier detect, receive signal level (always False, not supported)
Bool Ring indicator, indication of incoming call (always False, not supported)
Description
CM or CB is RS485 and no signals are available
105BCommunication processor
12.3 Point-to-Point (PtP) communication
Description
SGN_GET reads the current states of RS232
communication signals.
This function is valid only for the RS232 CM.
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