82
Manual – MOVIDRIVE® MDX60B/61B Communication and Fieldbus Unit Profile
7
Process data description
SEW Unit Profile
Special cases of
PO data
processing
Setting the process output data description separately allows for a great variety of
combinations. Not all of them are technically meaningful, however.
In addition to the process output data, the digital input terminals are generally also used.
In special cases, also the analog setpoint of the MOVIDRIVE
®
inverter is used.
32-bit process
output data
Process data that are longer than 16 bits and therefore occupy more than one process
data word, will not be processed by the drive inverter until they are fully mapped on the
process data channel.
Enable PO data
Changing the parameter
Setpoint description PO1 - PO3
causes the automatic disabling
of process output data with
PO data enable = No
. The process output data channel is
not available for processing until the parameter
PP data enable is set to YES
(e.g. by
the higher-level controller).
Setpoint specifica-
tion via fieldbus
missing
If a communication interface is entered as setpoint source and if no setpoint is
programmed for the process output data description, then the setpoint = 0 is
generated in the inverter.
No control word
specification via
fieldbus
If a communication interface is entered as control signal source and if no control
word is programmed for the process output data description, then the ENABLE
control command is specified in the inverter.
Double assign-
ment of the
process output
data channel
If several process output data words have the same setpoint description, only the
process output data word that is read first will apply. The order in which the process
output data words are processed in the inverter is PO1 - PO2 - PO3. This means if
PO2 and PO2 have the same setpoint description, only PO2 will take effect. The
content of PO3 is ignored.
NOTICE
Position setpoints have to be transferred consistently.
Possible consequences: The drive inverter might move to undefined positions
because, for example, an old position setpoint low and an already new position setpoint
high would be effective at the same time.
For more information on how to ensure data consistency and the resulting program-
ming techniques, refer to the project planning manual of the master interface module
of your programmable controller.
55030AEN
NO
Process output data deactivated.
Setpoint processing of the drive inverter continues until the fieldbus setpoints are activated
again with the last valid (frozen) process output data.
YES
Process output data enabled.
The drive inverter uses the process output data specified by the master.
PO 1
PO 2
Process output data
PO 3
P876: PO data enable
Summary of Contents for MOVIDRIVE MDX60B
Page 2: ...SEW EURODRIVE Driving the world...
Page 142: ......
Page 143: ...SEW EURODRIVE Driving the world...
