Rockwell Automation FactoryTalk Historian Classic User Guide - Manual (Page 23)

Collecting FactoryTalk Historian Classic Data Chapter 3
A data point is a specific data location or register in the control
system that is made available to FactoryTalk Transaction Manager
transactions. After it is defined, a data point can be used by any
FactoryTalk Transaction Manager transaction.
The FactoryTalk Transaction Manager interfaces with the industrial
control system device via a control connector. A control connector is
a Windows service that collects data from a data server, such as a
PLC and sends it to the FactoryTalk Transaction Manager.
You can use the following types of control connectors:
Item Description
Dynamic Data
Exchange (DDE) The DDE control connector service is provided for legacy
connections to DDE servers or to provide functionality that is not
supported by the OPC specification.
RSLinx Classic OPC The RSLinx Classic control connector service is the preferred method
to use when browsing for data tags that reside in Allen-Bradley
Programmable Logic Controllers, except for ControlLogix 555x
processor items. You should use Generic OPC control connectors
with ControlLogix 555x processors.
Generic OPC The Generic OPC control connector service is used to interface with
items provided by any OPC server that conforms to OPC interface
specifications.
FactoryTalk LiveData
Connector FactoryTalk Transaction Manager uses FactoryTalk Live Data to
communicate with FactoryTalk Live Data servers, such as RSLinx
Classic and RSView Supervisory Edition. FactoryTalk Transaction
Manager connects to the FactoryTalk Directory, which allows
FactoryTalk Transaction Manager to browse the available data
items. This control connector is required if you plan to perform
online edits with your configuration.
Types of control connectors
for the data collection
Rockwell Automation Publication HIST-UM001K-EN-E-June 2014 23