EVL, Exchange Variable List

This EVL object is a special type of Global Variable List (GVL) which can be used for exchanging unsafe data between a safety PLC and an unsafe PLC in a Compound Safety PLC.

Variables can be declared here like in a conventional GVL. However, all variables within an EVL are created in an "unsafe data area" (16#0800). This allows for write access to these variables from the unsafe PLC.

For more information about usage, see: Overview of the Compound Safety PLC and Handling of the Compound Safety PLC