14.3.3 Reference value / actual value
The PLC gives its reference value to the frequency inverter via object 0x6042/0
target
velocity
in the RxPDO used and receives the information on
its actual value back via
object 0x6044/0
control effort
in the TxPDO used.
The use of the reference/actual value channel depends on the set configuration (con-
trol system). The actual value is generated from the appropriate
source depending on
the control system used.
The reference value in object 0x6042/0
target velocity
and the actual value in object
0x6044/0
control effort
are interpreted in the notation RPM. Conversion into a fr
quency (reference value), or from a frequency (actual value) is carried out in the fr
The reference value for the frequency inverter from object 0x6042/0
target velocity
is
connected to the reference line value. This reference value is combined with the i
n-
ternal reference value from the reference frequency value channel in the input of the
ramp function. Reference frequency value channel: see operating instructions.
The internal reference value from the reference frequency value channel and the ref-
erence line value can be fed to the ramp individually or as an added variable. Setting
is carried out via the data set change-over capable parameter Ramp setpoint 434.
1 -
Internal reference
frequency value
Reference value from the sources of the reference fre-
quency value channel
Reference value via a communication interface
3 -
frequency value +
Sum of internal reference frequency value and reference
line value
This function is only relevant for non motion control configurations (Parameter Con-
figuration 30 ≠ x40)
04/13 CM-CAN ACU 175
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