Data Logging - Omron CX-Supervisor User Manual

Data Logging

20-6 Data Logging
• Keep scripts short
Although the script editor can manage hundreds of lines this would
suggest a serious design problem. Consider 30 lines as a practical
maximum.
This section covers some data logging related good practices.
• Utilise Data Logging performance
Always use the inbuilt Data Logging in preference to trend graphs or file I/
O functions, as the performance is far superior.
• Always use 'On Change'
Always log data 'On Change'. There is no sampling error and CPU, disk
activity and storage required are almost certainly reduced.
• Use deadband option
Consider using the deadband option, especially for noisy analogue
signals to reduce the actual logging and storage requirements.
• Don't 'Keep all files'
The Dataset 'Keep all files' checkbox defaults 'On' for complete data
retention but this should be cleared to stop the Hard Disk filling up.
SECTION 20 Best Practices
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