Process output data words PO1, PO2 and PO3 are used to transmit the setpoints listed in the following
table through the process output data channel. 32-bit values, such as e.g. position values, are
transmitted in two process data words. You may decide yourself in which process data word you
wish to transmit the more significant part (high) and the less significant part (low) respectively.
NO FUNCTION
SPEED
SPEED [%]
POSITION LO *
)
POSITION HI *
)
MAX. SPEED
MAX. CURRENT
SLIP
RAMP
CONTROL WORD 1
CONTROL WORD 2
*
)
Setting not possible for MOVITRAC
®
31..., size 0
No Function (NO FUNCTION)
If the
NO FUNCTION setting is active, the inverter will not use this process output data word for
setpoint processing. The content of the process output data word programmed to
NO FUNCTION will
be ignored even though the higher-level control might specify a real setpoint via the fieldbus system.
Speed Setpoint (SPEED)
The
SPEED setting causes the MOVITRAC
®
31.. inverter to interpret the setpoint transmitted in this
process data word as speed setpoint. Scaling of the speed setpoint see Section 3.3.5.
If the speed setpoint is assigned to the process output data word, the analogue setpoint will
automatically be deactivated. Execution of internal setpoint functions such as e.g. the selection of
internal fixed setpoints or the motorized potentiometer function are, however, given priority, i.e. the
speed setpoint specified via the fieldbus will not be effective in this case!
MO
VI
TR
AC
®
841
E
Q
RUN
BUS
FAULT
PD1
PD2
PD3
P564: PO3 SETP. DESCRIPT.
Control word 1
Control word 2
Speed setpoint
Current setpoint
etc.
Control word 1
Control word 2
Speed setpoint
Current setpoint
etc.
Control word 1
Control word 2
Speed setpoint
Current setpoint
etc.
P560: PO1 SETP. DESCRIPT.
P562: PO2 SETP. DESCRIPT.
Fieldbus
CONTROL MODE
Process output data (PO)
00316AEN
Fig. 6: Setpoint description of the process output data (PO)
3
Inverter Control
with Process Data
MOVITRAC
®
31.. Fieldbus Unit Profile
13
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