Port_Cfg (Configure Communication Parameters Dynamically) Instruction - Siemens S7-1200 System Manual

Communication processor and Modbus TCP
12.3 Point-to-point (PtP) communication
12.3.3.2

PORT_CFG (Configure communication parameters dynamically) instruction

Table 12- 7 PORT_CFG (Port Configuration) instruction
LAD / FBD
STEP 7 automatically creates the DB when you insert the instruction.
1
The PORT_CFG configuration changes are not permanently stored in the CPU. The
parameters configured in the device configuration are restored when the CPU transitions
from RUN to STOP mode and after a power cycle. See Configuring the communication ports
(Page 672) and Managing flow control (Page 674) for more information.
Table 12- 8 Data types for the parameters
Parameter and type
REQ IN
PORT IN
PROTOCOL IN
BAUD IN
PARITY IN
DATABITS IN
STOPBITS IN
686
SCL
"PORT_CFG_DB"(
REQ:=_bool_in_,
PORT:=_uint_in_,
PROTOCOL:=_uint_in_,
BAUD:=_uint_in_,
PARITY:=_uint_in_,
DATABITS:=_uint_in_,
STOPBITS:=_uint_in_,
FLOWCTRL:=_uint_in_,
XONCHAR:=_char_in_,
XOFFCHAR:=_char_in_,
WAITTIME:=_uint_in_,
DONE=>_bool_out_,
ERROR=>_bool_out_,
STATUS=>_word_out_);
Data type Description
Bool Activate the configuration change on 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. (Default value:
0)
UInt 0 - Point-to-Point communication protocol (Default value)
1..n - future definition for specific protocols
UInt Port baud rate (Default value: 0):
1 = 300 baud, 2 = 600 baud, 3 = 1200 baud, 4 = 2400 baud, 5 = 4800 baud,
6 = 9600 baud, 7 = 19200 baud, 8 = 38400 baud, 9 = 57600 baud,
10 = 76800 baud, 11 = 115200 baud
UInt Port parity (Default value: 0):
1 = No parity, 2 = Even parity, 3 = Odd parity, 4 = Mark parity,
5 = Space parity
UInt Bits per character (Default value:):
1 = 8 data bits, 2 = 7 data bits
UInt Stop bits (Default value: 0):
1 = 1 stop bit, 2 = 2 stop bits
Description
PORT_CFG allows you to change port parameters
such as baud rate from your program.
You can set up the initial static configuration of the
port in the device configuration properties, or just use
the default values. You can execute the PORT_CFG
instruction in your program to change the
configuration.
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG