Data persistence

Persistent data retain their values when the PLC project is reloaded. The values of persistent data can be restored after an uncontrolled termination (power failure), a download or a cold start.

In addition to the PERSISTENT variables, the RETAIN variables are a further way of keeping data remanent. RETAIN variables likewise retain their values in the case of uncontrolled termination (power failure), a download or a cold start.

See also:

• Resetting the PLC project
• Reference Programming: Remanent variables – PERSISTENT, RETAIN
• Retain data