Setup guide

OSx Migration Cookbook August 30, 2006

9 – Tags

What is a tag?

How are OSx tags

migrated to PCS

PCS 7 tag

structures and

OSx 505 tags

The main unit of data used throughout the OSx and PCS 7 systems

is the tag. However, each applies the term ‘tag’ differently.

In OSx, a tag is a logical object that groups a particular type of data

with its range, alarm, limits, status, deadband, etc. Each of these

items is called an attribute of the tag. Some attributes are the same

for all tag types. Others differ based on the type.

In PCS 7, the equivalent of an OSx tag object is called a tag

structure. Each OSx 505 tag type is represented by a PCS 7 tag

structure. Each OSx 505 tag attribute is treated as a tag in PCS 7.

For example, suppose there is an OSx 505 AI tag called AI_12. It

has an attribute called PV for process value, the tag’s value in the

PLC. In PCS 7, AI_12 is an instance of a 505_AI tag structure, and

AI_12.PV is a tag in that structure.

The mechanism used to migrate OSx tags to PCS 7 is determined

by whether the tags are S7 or 505 tags. To migrate S7 tags, transfer

your project from the ES tools you used with OSx to the ES tools

on your PCS 7 engineering station. You may need to upgrade the

ES tools you used with OSx to the latest version. You will also

need to create faceplates and symbols for S7 versions of OSx tag

types on PCS 7. For 505 tags you use DBA to import standard OSx

install.tag files. Faceplates and symbols for 505 tags are provided

with PCS 7/505 OS.

OSx has 23 different 505 tag types. Tags of 19 of these types can be

migrated to PCS 7. Because PCS 7 treats and configures stations

differently from OSx, there is no need for data_node tags. Because

PCS 7 handles local station errors differently from OSx there is no

need for system tags. Finally, because there is no equivalent to OSx

batch in PCS 7 so there is no need for unit and batch tags.