Allen Bradley PLC Data Address

Introduction

There are two distinct ranges of Allen Bradley PLC Devices:

Model Types	Summary
SLC-500, MicroLogix, PLC-5.	To access data in this type of PLC, use the Allen Bradley PLC File Data Address. These models are configured using ladder logic and store data in files. Tags in Fernhill SCADA are mapped to locations in the data files. Fernhill SCADA uses this data address format when the PLCType Configuration Property is set to 0 (Micrologix, SLC and PLC-5).
ControlLogix, CompactLogix, Micro820, Micro850, Micro870	To access data in this type of PLC, use the Allen Bradley Logix PLC Data Address. These models are configured using IEC 61131-3 and store data in variables. Tags in Fernhill SCADA are mapped to variables in the PLC. Fernhill SCADA uses this data address format when the PLCType Configuration Property is set to 1 (ControlLogix, CompactLogix).

Further Information

Allen Bradley Register Block Tag

To learn about Allen Bradley Register Block Tags.

Allen Bradley Driver

For an overview of the Allen Bradley Driver.

For the meaning of terms used in Fernhill SCADA.