Converteam ALSPA MV3000e, Техническое руководство

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2. Specification ALSPA PROFIBUS Field Bus Coupler
Page 2-2 Technical Manual (09/06)
Cyclic Channel Transmit:
•
1 status word (16 bit), and
•
5 monitor values (16 bit).
2.1.5 MVS3007-4002 board Data Volume
Cyclic Channel Receive:
•
1 control word (16 bit), and
•
1, 5 or 9 reference demands (16 bit),
or,
•
2 control words (16 bit), and
•
0, 4 or 8 reference demands. (16 bit).
Cyclic Channel Transmit:
•
1 status word (16 bit), and
•
1, 5 or 9 monitor values (16 bit).
2.1.6 Data Consistency
CAUTION
When using the PROFIBUS interface to transfer values that
span more than one 16-bit word (e.g. a 32-bit value) the
interface does not guarantee that all members of the data set
will be sent at the same time. The user must therefore ensure
that the received value is valid.
This is best explained by an example:
The position Feedback is contained in two parameters, P38.02 and
P38.03. If the drive is configured to transmit these parameters to the
PROFIBUS network and the value is changing, the following
sequence of values could be transmitted on consecutive
PROFIBUS transmissions: