Eaton Electrical EZ204-DP user manual EZ800/EZD Control Commands

7 EZ800/EZD Control Commands

Data exchange procedure The Control commands 9 bytes module allows extended data exchange of the EZ800 and the EZD on the PROFIBUS-DP communication bus. This allows you to transfer services from the following areas:

•Read/write date and time (Page 95)

•Read/write image data (Page 99) and

•Read/write function block data (Page 120).

A data exchange procedure is required in order to ensure the safe exchange of data via PROFIBUS-DP from master to slave and vice versa.

Attention!

While a control command is being executed, the input and output data will remain in the state before the control command was called. Only after the “Control commands” data exchange has been completed, will the I/O data be refreshed.

Caution!

Only those values specified for the command code should be used.

Check the values that you write in order to avoid malfunctions.

Requirement:

The “Control commands 9 byte” module must have been selected.

The master initiates the data exchange of the control commands and the addressed slave responds.

During communication 9 data bytes (byte 0 = toggle byte, bytes 1 to 8 information bytes) are sent via PROFIBUS.

The basic telegram structure is shown in the following diagram.

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