Modbus TCP

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Modbus TCP

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To create a new Modbus TCP(UDP) server select the menu item Modbus TCP(UDP). You’ll see the following window:

modbustcpproperties

List or properties:

Property

ST script field*

Description

Name


Name of the Modbus TCP server.

IP or DNS

ipaddress

IP address or DNS of the Modbus TCP server.

Port

port

Port of the Modbus TCP server.

Poll interval

interval

Polling interval (period) of the server's requests.

Type

type

Communication protocol of Modbus server - TCP or UDP.

Request type

requesttype

Choose request type:

- Maximum registers - if you choose this type the application during polling will send maximum modbus pointers in 1 polling request.

- Consecutive registers - if you choose this type the application during polling will send only consecutive modbus pointers in 1 polling request.

- 1 pointer registers - if you choose this type the application during polling will send only registers used by 1 pointer in 1 polling request.

RTU via TCP(UDP)

rtuviatcp

Check it if you use Modbus converter from serial into TCP(UDP) protocol.

Without function 6

withoutfun

Check Without function 6 if your controller doesn’t support Modbus writing function 6.

* This field is used in ST scripts. For example: Servers.Server1.requesttype = 0. In this script command request type of the Server1 become Maximum registers. Also for all servers you can use fields:

connect - connect to the server.

connected - check connection.

lostconnection - check lost or not connection.