Data Logging

The CDP Logger library contains components and blocks for logging and processing values and events.

Note: The CDP Logger library is a licensed feature. See the CDP Runtime License manual for more information.

CDP Logger Component

The CDP Logger is a component for logging values and events. It is designed for long-term storage of high-frequency data. Depending on the selected Datastore, data is either stored to a local file or a remote server.

• How to Setup Logging in Automation System
• CDP Logger Configuration Manual
  • Viewing Data

Sequencer Blocks

The CDP Logger library contains blocks for event-based computing as defined by IEC 61499 for the CDP Sequencer addon. The below blocks are useful for extracting and processing of CDP Logger data:

• EventLogReader - connects to a running CDP Logger or LogServer and queries the event log.
• ValueLogReader - connects to a running CDP Logger or LogServer and queries the value log.
• LogWriter - an event-based block for writing data. Useful for storing data extracted by EventLogReader or ValueLogReader.

To serve LogWriter data (similar to what CDP Logger's built-in server does for logger data), use the LogServer component.

Datastores

The Datastore is the backend used by CDP Logger component and LogWriter block, usually some database. The following datastores are available:

• CDPCompactDatastore
• InfluxDB
• CSVDatastore

See Choosing a Datastore for more information.

Tools

• Database Extractor Tool - allows to take a backup or extract a small part of CDPCompactDatastore data