Siemens PC 670 Guide de l'utilisateur Page 22

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Product Description
3-8
ProTool/Pro Runtime User’s Guide
Release 12/99
Display messages
The events stored in the message buffer can be displayed according to different
criteria. The following predefined objects are available for display purposes:
Message line (refer to Page 6-12)
Message window (refer to Page 6-12)
Message page (refer to Page 6-14)
Message buffer (refer to Page 6-15)
Message view
Message view with full functionality (refer to Page 6-16)
Simple message view with restricted functionality (refer to Page 6-17)
3.1.3 Tags
Definition
Tags are fixed memory locations on the operating unit into which values are written
and/or read. The actions can be initiated from the PLC or by operations executed
on the operating unit.
Global and local tags
A fundamental distinction is made between the following types of tag:
Global tags
Global tags are process tags. They are used to establish a connection to the
PLC. An address must be assigned in the PLC for each global tag. The
operating unit accesses this address to write to or read from it.
Local tags
Local tags have no connection to the PLC. They are only available in the
operating unit. Local tags are created in order, for example, to enter limit values
via the operating unit.
VB script tags
Internal script tags must be defined with the DIM instruction and are only valid
within the VB Script procedure.
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