3.2
Process Data Configuration
The MOVITRAC
®
31.. inverter can be controlled via the fieldbus system with one, two or three process
data words. The number of process input data (PI) and process output data (PO) is identical.
The process data configuration settings are made via the fieldbus option pcb, either through the
hardware (e.g. FFI 31A) or via the fieldbus master at the start of the bus system (e.g. PROFIBUS-DP).
The inverter automatically receives the right setting from the fieldbus option pcb.
You can check the current process data configuration in the menu item
P070 PD Configuration by
means of the fieldbus monitor on the hand-held keypad or by means of MC_SHELL (Fig. 4).
Depending on the type of fieldbus option pcb used, PD configurations according to the following
table can be used.
PD configuration
1 Process data word + parameter channel
1PD+PARAM
1 Process data word
1PD
2 Process data words + parameter channel
2PD+PARAM
2 Process data words
2PD
3 Process data words + parameter channel
3PD+PARAM
3 Process data words
3PD
The parameter channel is only of significance for fieldbus systems without layer 7 functionality, e.g.
PROFIBUS-DP. Only the number of process data (i.e. 1PD..., 2PD... or 3PD...) is of interest when
controlling the inverter by means of process data.
Programmable logic controllers are used as fieldbus masters, the process data are generally sent
directly to the I/O or peripheral area. The I/O or peripheral area in the PLC must therefore make
sufficient memory space available for the inverter process data (Fig. 5). Addresses are usually
allocated between the inverter process data and the PLC address area on the fieldbus master module.
M
O
VI
TRAC
®
841
E
Q
RUN
BUS
FAULT
PD1
PD2
PD3
PD1
PD2
PD3
Fieldbus
CONTROL MODE
Process input data (PI)
Process output data (PO)
00313AEN
Fig. 3: Process data channel for the SEW MOVITRAC
®
31.. inverter
070
3PD+PARAM
PD CONFIGURATION
00314AEN
Fig. 4: Process data configuration
3
Inverter Control
with Process Data
MOVITRAC
®
31.. Fieldbus Unit Profile
11
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