Siemens SIMATIC S7-1200

Communication processor and Modbus TCP
13.6 Legacy PtP communication (CM/CB 1241 only)
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
1233
13.6.1.8
SGN_SET (Set RS-232 signals)
Table 13- 115 SGN_SET (Set RS232 signals) instruction
LAD / FBD
SCL
Description
"SGN_SET_DB"(
REQ:=_bool_in_,
PORT:=_uint_in_,
SIGNAL:=_byte_in_,
RTS:=_bool_in_,
DTR:=_bool_in_,
DSR:=_bool_in_,
DONE=>_bool_out_,
ERROR=>_bool_out_,
STATUS=>_word_out_);
SGN_SET sets the states of RS232 communication
signals.
This function is valid only for the RS232 CM.
1
STEP 7 automatically creates the DB when you insert the instruction.
Table 13- 116 Data types for parameters
Parameter and type
Data type
Description
REQ IN Bool Start the set RS232 signals operation, on the rising edge of this input
(Default value: False)
PORT IN 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. (Default
value: 0)
SIGNAL IN Byte Selects which signal to set: (multiple allowed). Default value: 0
• 01H = Set RTS
• 02H = Set DTR
• 04H = Set DSR
RTS IN Bool Request to send, module ready to send value to set (true or false), De-
fault value: False
DTR IN Bool Data terminal ready, module ready to send value to set (true or false).
Default value: False
DSR
IN
Bool
Data set ready (only applies to DCE type interfaces), not used.
DONE OUT Bool TRUE for one execution after the last request was completed with no
error
ERROR OUT Bool TRUE for one execution after the last request was completed with an
error
STATUS
OUT
Word
Execution condition code (Default value: 0)