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WinCC -- Product information -- Additional information on version < V5

	DP channel and redundancy (Multimaster) with V 4.x
	Why are the archives different in size and how can you reduce their size?
	pcANYWHERE and file transfer with WinCC V4.02
	How do you delete all the messages from the long-term archive?
	Character variables after upgrading from V4.x to V4.02
	GetInputValueDouble() produces the wrong return value in WinCC V4.x
	Automatic logon under Windows NT doesn't always work
	CP5611 (Release 5) and WinCC V4.x
	Connection between WinCC V4.x and PLCSIM V4.0
	Automatic logging on under Windows NT
	Why are the current values not stored in the database with Tag Logging in WinCC V4.0x?
	Access to the Sybase database permitted as per the licencing law
	Migration of COROS LS-B/FlexOS or COROS LS-B/WIN to WinCC

WinCC -- Configuring Tag Logging -- Tag Logging performance

	What influence do the archiving parameters have on the system's performance?
	Why are the current values not stored in the database with Tag Logging in WinCC V5.x?
	Why is a specified percentage hysteresis not suitable for suppressing minor fluctuations in process values in "archive only upon change" mode?
	How can you recognize resource bottlenecks in advance from WinCC and react to them accordingly?
	Why are the archives different in size and how can you reduce their size?
	Why are the current values not stored in the database with Tag Logging in WinCC V4.0x?
	Why are values sometimes lost during archiving?
	How much hard drive space do measured values of SIMATIC WinCC V6.0 or PCS 7 V6.0 require?

Why are the current values not stored in the database with Tag Logging in WinCC V4.0x?

Part number:

Description
For the sake of performance, 50 values are always stored in a buffer. This is only the case for sequential logs. You can read out the current value using API functions, e.g. TLGGetArchivData.

Keywords
Trend configuration

Entry ID:1117419

Date:2010-02-04

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