Mb_Comm_Load (Configure Port On The Ptp Module For Modbus Rtu) Instruction - Siemens S7-1200 System Manual
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12.5.3.1
MB_COMM_LOAD (Configure port on the PtP module for Modbus RTU) instruction
Table 12- 63 MB_COMM_LOAD instruction
LAD / FBD
Table 12- 64 Data types for the parameters
Parameter and type
REQ
IN
PORT
IN
BAUD
IN
PARITY
IN
FLOW_CTRL
IN
1
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG
SCL
"MB_COMM_LOAD_DB"(
REQ:=_bool_in,
PORT:=_uint_in_,
BAUD:=_udint_in_,
PARITY:=_uint_in_,
FLOW_CTRL:=_uint_in_,
RTS_ON_DLY:=_uint_in_,
RTS_OFF_DLY:=_uint_in_,
RESP_TO:=_uint_in_,
DONE=>_bool_out,
ERROR=>_bool_out_,
STATUS=>_word_out_,
MB_DB:=_fbtref_inout_);
Data type
Description
Bool
A low to high (positive edge) signal starts the operation.
(Version 2.0 only)
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.
UDInt
Baud rate selection:
300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 76800, 115200,
all other values are invalid
UInt
Parity selection:
0 – None
•
1 – Odd
•
2 – Even
•
UInt
Flow control selection:
0 – (default) no flow control
•
1 – Hardware flow control with RTS always ON (does not apply to
•
RS485 ports)
2 – Hardware flow control with RTS switched
•
Communication processor and Modbus TCP
12.5 Modbus communication
Description
The MB_COMM_LOAD instruction configures a
PtP port for Modbus RTU protocol
communications. Modbus port hardware options:
Install up to three CMs (RS485 or RS232), plus
one CB (R4845). An instance data block is
assigned automatically when you place the
MB_COMM_LOAD instruction in your program.
747
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