Cyclic Memory Access - Beckhoff EP6080-0000 Documentation

5.3

Cyclic memory access

Data traffic with cyclic process data
The user can create one set of process data with an arbitrary structure, max. 1280 bytes. This data set can
be written cyclically in its entirety to the box or read by it. Individual access to the constituent parts of this
data set is not possible (keyword: addressing). Control is performed by the task by means of a handshake
via Control/Status Word, so that several task cycles may be necessary for saving or reading back,
depending on the extent of the data and the cycle time.
When the EP6080-0000 is switched on, the regularly stored data from the last operating session are
immediately available for reading via the inputs.
Commissioning: the cyclic process image must be created identically at inputs and outputs, max.
1280 bytes. Creation by right-clicking on "IO Inputs" or "IO Outputs".
Fig. 7: Manual creation of the cyclic process data
If the input and output are created in different sizes, the box start fails: "PREOP to SAFEOP failed".
If more than 1280 bytes are created, the box start fails with "Invalid SM In/Out Cfg".
• The data to be written from the task to the EP6080-0000 is output via the PDO "IO Outputs".
• The last valid data received from the EP6080-0000 arrives at the task as read data via the PDO "IO
Inputs" without further action.
EP6080-0000 Version: 1.0
Commissioning and configuration
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