MOVIDRIVE
®
PROFIBUS DFP11A
35
The PROFIBUS-FMS
Interface
4
In straight PROFIBUS-FMS mode, an FMS higher level automatic system can control the
MOVIDRIVE
®
drive inverter via the process data channel using the communications objects listed
in Table 5. The process output data are transferred during this process to the appropriate process
output data object by the Write service. Process input data are read by the Read service into the
relevant process input data object. Whereas the process input data objects can generally only be
read, the process output data objects have both Read and Write access. So in mixed mode (DP/
FMS), for example, the process output data sent by the DP master can be read and visualized by
the FMS master.
The data consistency required for the exchange of data via PROFIBUS-FMS is achieved by provid-
ing the appropriate communications objects for each process data length. With a process data
length of 3, for example, process data exchange will only be consistent with the objects “3 PI” and
“3 PO”. Fig. 32 shows the various ways of accessing communications objects in mixed mode (DP/
FMS).
01078AEN
Fig. 32: Process data access of DP master and FMS master in mixed mode (DP/FMS)
4.2.2.1 Process Output Data Objects
Table 6, Table 7 and Table 8 show the communications objects for the process output data
(setpoints from master to drive inverter). In straight FMS mode, the FMS master can use the FMS
service Write to write these objects and thus control the drive inverter via the process data channel.
Furthermore, in mixed mode (DP/FMS) an FMS master can use the FMS service Read to read (and
if necessary visualize) the setpoints specified by a DP master via PROFIBUS-DP.
Table 6: Description of the object “1 process output data word (1 PO)”
Index:
8288
Object code:
7 (Simple variable)
Data type index:
10 (Octet string)
Length:
2 Byte
Local address:
-
Password:
-
Access groups:
-
Access rights:
Read all / Write all
Name[16]:
-
Extension length:
-
E
Q
P O 3
P O 2
P O 1
P I 3
P I 2
P I 1
PROFIBUS-DP master
PROFIBUS-FMS master
Visualization
(Read access)
(Read /
Write access)