DirectWriteByte Command

Introduction

The DirectWriteByte command directly writes one or more BYTEs to a PLC or Device.

Parameters

DataAddress : ANY_STRING: The data address within the PLC or Device. The format of this parameter depends on the PLC type. See the remarks section to determine which format to use.
Data : ARRAY OF BYTE: One or more words to write to the PLC or Device.

Remarks

The DirectWriteByte command writes one or more bytes directly to a PLC or Device.

To use the DirectWriteByte command:

The user requires theDirectWrite User Right, and
The EnableDirectWrite field on the PLC Device Tag must be set to True.

The format of the DataAddress parameter depends on the type of PLC being written to. Use this table to lookup the appropriate format for a given PLC type:

PLC Type	DataAddress Format
Idec Micro	Idec Micro PLC Data Address Format
Siemens S7	Siemens S7 PLC Address Format

You can execute DirectWriteByte tag command from:

From a Program Tag using a TagDirectWriteByte function block.
The .NET API. For an example see Executing a Tag Command from .NET Code.
The Java API. For an example see Executing a Tag Command from Java.

Requirements

Fernhill SCADA Version	Version 2.3
Required User Right	DirectWrite

Applies To

The DirectWriteByte can be used with these tag types: