Allen Bradley PLC Tag

Introduction

The Allen Bradley PLC Tag PLC Device Tag Icon provides a logical link to an Allen Bradley PLC.

Configuration Properties

The Allen Bradley PLC Tag supports the configuration properties of the PLC Device Tag with RTC, plus these additional configuration properties:

Property Type Version Description
Channel Reference 2.2 The Allen Bradley Serial Communication Channel or the Allen Bradley Ethernet Communication Channel to the device.
DestinationNode USINT 2.2 The destination node of the PLC 0-254.

Tag Commands

The Allen Bradley PLC Tag supports the tag commands of the PLC Device Tag with RTC plus these commands:

Tag Command Version Description
DirectWriteWord 2.3 Directly writes one or more words to an address in the PLC.
DirectWriteBit 2.3 Directly writes a single bit to an address in the PLC.
Refresh 3.15 Requests an immediate refresh of all of the IO Data tags associated with the PLC.

Example Configuration

This is an example of an Allen Bradley PLC Tag at address 1, communicating via a serial channel called ".RemotePlant":

PropertyValue
Channel.RemotePlant
DestinationNode1

Relationships to Other Tag Types

The Allen Bradley PLC Tag builds on the features of these tag types:

Further Information

Allen Bradley Serial Communication Channel

For more information on Allen Bradley serial communication channels.

Allen Bradley Ethernet Communication Channel

For more information on Allen Bradley Ethernet communication channels.

Allen Bradley Register Blocks

For more information on the Allen Bradley Register Block Tag tags that can be associated with Allen Bradley PLC Tag tags.

Alarm Handling

To learn about alarm management.

Glossary

For definitions of the terms used in Fernhill SCADA.