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MB_SERVER (Communicate using PROFINET as Modbus TCP server) instruction

Table 13- 62 MB_SERVER instruction

Table 13- 63 Data types for the parameters

Parameter and type

CPU firmware version requirement

The Modbus TCP instructions described in this section of the manual require firmware

release V4.1 or later.

S7-1200 Programmable controller

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

"MB_SERVER_DB"(

DISCONNECT:=_bool_in_,

CONNECT:=_variant_in_,

NDR=>_bool_out_,

DR=>_bool_out_,

ERROR=>_bool_out_,

STATUS=>_word_out_,

MB_HOLD_REG:=_variant_inout_);

MB_SERVER attempts to make a "passive" connection with a partner device.

This means that the server is passively listening for a TCP connection request

from any requesting IP address.

If DISCONNECT = 0 and a connection does not exist, then a passive connec-

tion can be initiated.

If DISCONNECT = 1 and a connection exists, then a disconnect operation is

initiated. This parameter allows your program to control when a connection is

accepted. Whenever this input is enabled, no other operation will be attempt-

Reference to a Data block structure that contains connection parameters in

the system data type "TCON_IP_v4".

Pointer to the MB_SERVER Modbus holding register: The holding register

must either be a non-optimized global DB or an M memory address. This

memory area is used to hold the data a Modbus client is allowed to access

using Modbus register functions 3 (read), 6 (write), and 16 (write).

New Data Ready: 0 = No new data, 1 = Indicates that new data has been

written by a Modbus client

Data Read: 0 = No data read, 1 = Indicates that data has been read by a

Modbus client.

The ERROR bit is TRUE for one scan, after MB_SERVER execution ended

with an error. The error code at the STATUS parameter is valid only during

the single cycle where ERROR = TRUE.

Execution condition code

Communication processor and Modbus TCP

13.5 Modbus communication

MB_SERVER communicates as a Modbus

TCP server through the PROFINET port on

the S7-1200 CPU. No additional communi-

cation hardware module is required.

MB_SERVER can accept a request to con-

nect with Modbus TCP client, receive a

Modbus function request, and send a re-

sponse message.

Siemens SIMATIC S7-1200 System Manual page 1179

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