Modbus TCP Channel Tag

Introduction

The Modbus TCP Channel Tag Channel Tag Icon provides a TCP/IP SCADA/HMI communication channel to Modbus PLCs.

Configuration Properties

The Modbus TCP Channel Tag supports the properties of the Active Channel Tag plus these properties:

PropertyTypeVersionDescription
Host WSTRING 1.0 The host name or IP address of the Modbus TCP device or PLC.
Port WSTRING 1.0 The port number used for communications. The default port number for Modbus is 502.
Protocol USINT 1.0 The communications protocol. 0 - Modbus TCP, 1 - Modbus RTU over TCP.

Tag Commands

The Modbus TCP/IP Channel Tag supports the tag commands of the Modbus Channel Tag.

Example Configuration

This is an example of a channel configured to support Modbus TCP protocol to host 192.168.1.20:502 :

PropertyValue
ReplyTimeoutT#2s
Host192.168.1.20
Port502
ProtocolModbus TCP

Relationships to Other Tag Types

The Modbus TCP/IP Channel Tag builds on the features of these tag types:

Further Information

Active Channel Tag

To learn about the properties common to all active channels.

Modbus serial channel

To learn about Modbus Serial Channels.

Modbus Device Tag

To learn about Modbus Device Tags that can be associated with Modbus TCP Channel Tags.

Alarm Handling

To learn about alarm management.

Glossary

For definitions of the terms used in Fernhill SCADA.