3.3.2
PO Data Processing in the Inverter
Separate setting of the process output data description allows a multitude of combinations to be set
though not all of them make sense from a technical point of view. Table 5 gives a selection of
combinations, which are technically expedient. A column is reserved in the table for each process
output data word, the assignment of the column to the process output data PO1 - PO3 however is
arbitrary so that the columns are designated as PO X - PO Z.
PO X
PO Y
PO Z
Functionality
CONTROL WORD 1
SPEED
–
Control and speed setpoint via fieldbus
CONTROL WORD 1
–
–
Control via fieldbus, setpoint via analog input
or
Control and motor pot./int. fixed setpoints via fieldbus
CONTROL WORD 1
SPEED
RAMP
Control/speed setpoint/ramp via fieldbus
CONTROL WORD 1
SPEED
MAX. SPEED
Control/speed setpoint/max. speed via fieldbus
CONTROL WORD 1
SPEED
MAX. CURRENT
Control/speed setpoint/max. current via fieldbus
CONTROL WORD 1
SPEED
SLIP
*)
Control/speed setpoint/slip via fieldbus
CONTROL WORD 1
POSITION HI
POSITION LO
*)
Control and position entry via fieldbus
(only in conjunction with IPOS)
CONTROL WORD 2
SPEED
–
Control incl. virtual terminals and speed setpoint via
fieldbus
CONTROL WORD 2
–
–
Control via fieldbus, function select via virtual terminals
(e.g. IPOS table positions IPOS)
CONTROL WORD 2
POSITION HI
POSITION LO
*)
Inverter control and position entry via fieldbus and,
if applicable, processing of the virtual terminals in the
IPOS program (only in conjunction with IPOS)
*)
Setting not possible for MOVITRAC
®
31..., size 0
In addition to the process output data from the fieldbus system the digital input terminals and, in
special cases, the analogue setpoint from the MOVITRAC
®
31.. inverter are used, too.
Special cases in respect of the process output data processing in the inverter are:
- No speed setpoint entry from the fieldbus system
- No control word entry from the fieldbus system
- Duplicate usage of the process output data channel
- Simultaneous transmission of control word 1 and control word 2
- 32-bit process output data
No Speed Setpoint Entry from the Fieldbus System
If no speed setpoint is transmitted via the process output data, the analogue setpoint or the internal
setpoint functions, i.e. motorized potentiometer or fixed setpoints (n11...) (if activated via the control
word), will be active.
No Control Word Entry from the Fieldbus System
If no control word is transmitted to the inverter via the process output data, control of the MOVITRAC
®
31.. inverter is exclusively via the digital input terminals.
3
Inverter Control
with Process Data
MOVITRAC
®
31.. Fieldbus Unit Profile
17
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: [email protected]
