Allen Bradley DF1 Serial Channel Tag

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5. DF1 Serial Channel Tag

Introduction

The Allen Bradley DF1 Serial Channel Tag provides a DF1 serial SCADA communication channel to Allen Bradley PLC Devices.

Configuration Properties

The Allen Bradley DF1 Serial Channel Tag supports the configuration properties of the Allen Bradley Channel Tag plus these properties:

Property	Type	Version	Description
Mode	WSTRING	2.2	The serial port communication speed, data format and handshake mode. Click the Browse button to edit the serial port mode using the Serial Port Mode Editor. You can also type in the serial port mode string directly. See Serial Port Mode String for how this property is formatted.
Port	WSTRING	2.2	The name of the communications port. For example 'COM1:'
ErrorCheck	USINT	2.2	The error checking mode. 0 = CRC, 1 = BCC.
Protocol	USINT	3.8	The protocol variant used by the channel. 0 = Full Duplex, 1 = Half Duplex.
SourceNode	USINT	2.2	The node address used on this channel by Fernhill SCADA (0-254).
TransmitDelay	TIME	3.8	Only used in Half Duplex mode. The delay between the start of the next transmission and the last character received. Note: If you are using a 1761-NET-AIC+ Advanced Interface Converter, use the default value of 20ms. This value ensures the Auto Transmit Delay feature of the 1761-NET-AIC+ does not drop the start of the messages sent by Fernhill SCADA.

Tag Commands

The Allen Bradley DF1 Serial Channel Tag supports the tag commands of the Allen Bradley Channel Tag.

Example Configuration

This is an example of a channel configured as follows:

• Use COM1 as the connection.
• The protocol is DF1 Full Duplex.
• The baud rate is 19200 (the default for many Allen Bradley PLC Devices)
• The framing is No Parity, 8 Data Bits and 1 Stop bit.

Relationships to Other Tag Types

The Allen Bradley DF1 Serial Channel Tag builds on the features of these tag types:

• Allen Bradley Channel Tag
• Active Channel Tag
• Channel Tag
• Alarm Tag
• Core Tag

Further Information

Allen Bradley PLC Tag

To learn about the Allen Bradley PLC Tags that can be associated with Allen Bradley DF1 Serial Channel Tags.

Alarm Conditions

To learn about abnormal conditions in SCADA applications.

Serial Port Mode Editor

To learn how to set the communications speed, data format, and handshake mode of the serial port.

Glossary

For the meaning of terms used in Fernhill SCADA.

Fernhill SCADA Version 3.94 (20230515.1). Copyright © 2012-2023 Fernhill Software Ltd: All rights reserved.