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Communication processor and Modbus TCP

13.5 Modbus communication

EN_DIAG_ALARM

Required setting for the use of PROFIBUS cables with CM 1241 for RS485

Table 13- 73 Modbus_Comm_Load execution condition codes

STATUS (W#16#)

In addition to the Modbus_Comm_Load errors listed above, errors can be returned from the underlying PtP communica-

tion instructions.

Modbus_Master (Communicate using SIPLUS I/O or the PtP port as Modbus RTU master) instruction

Table 13- 74 Modbus_Master instruction

Invalid port ID value (wrong port/hardware identifier for communication module)

Invalid baud rate value

Invalid parity value

Invalid flow control value

Invalid response timeout value (response timeout less than the 5 ms minimum)

MB_DB parameter is not an instance data block of a Modbus_Master or Modbus_Slave

instruction.

"Modbus_Master_DB"(

REQ:=_bool_in_,

MB_ADDR:=_uint_in_,

MODE:=_usint_in_,

DATA_ADDR:=_udint_in_,

DATA_LEN:=_uint_in_,

DONE=>_bool_out_,

BUSY=>_bool_out_,

ERROR=>_bool_out_,

STATUS=>_word_out_,

DATA_PTR:=_variant_inout_);

Activate diagnostics interrupt:

0 = not activated

1 = activated

Number of stop bits:

1 = 1 stop bit

2 = 2 stop bits

0, 3 to 255 = reserved

The Modbus_Master instruction communicates as

a Modbus master using a port that was configured

by a previous execution of the Mod-

bus_Comm_Load instruction. An instance data

block is assigned automatically when you place the

Modbus_Master instruction in your program. This

Modbus_Master instance data block is used when

you specify the MB_DB parameter for the Mod-

bus_Comm_Load instruction.

S7-1200 Programmable controller

System Manual, V4.2, 09/2016, A5E02486680-AK

Siemens SIMATIC S7-1200 System Manual page 1198

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