Siemens SIMATIC S7 System Manual page 571

Table 12- 36 Data types for the parameters
Parameter and type
RUN IN
OFF2 IN
OFF3 IN
F_ACK IN
DIR IN
DRIVE IN
PZD_LEN IN
SPEED_SP IN
CTRL3 IN
CTRL4 IN
CTRL5 IN
CTRL6 IN
CTRL7 IN
CTRL8 IN
NDR OUT
ERROR OUT
STATUS OUT
RUN_EN OUT
D_DIR OUT
INHIBIT OUT
FAULT OUT
S7-1200 Programmable controller
System Manual, 11/2011, A5E02486680-05
Data type Description
Bool Drive start bit: When true, this input enables the drive to run at the
preset speed. When RUN goes to false while a drive is running, the
motor will be ramped down to a stop. This behavior differs from the
dropping power (OFF2) or braking the motor (OFF3).
Bool Electrical stop bit: When false, this bit cause the drive to coast to a stop
with no braking.
Bool Fast stop bit: When false, this bit causes a fast stop by braking the
drive rather than just allowing the drive to coast to a stop.
Bool Fault acknowledge bit: This bit is set to reset the fault bit on a drive.
The bit is set after the fault is cleared to indicate to the drive it no longer
needs to indicate the previous fault.
Bool Drive direction control: This bit is set to indicate that the direction is
forward (for positive SPEED_SP).
USInt Drive address: This input is the address of the USS drive. The valid
range is drive 1 to drive 16.
USInt Word length: This is the number of words of PZD data. The valid values
are 2, 4, 6, or 8 words. The default value is 2.
Real Speed set point: This is the speed of the drive as a percentage of
configured frequency. A positive value specifies forward direction
(when DIR is true). Valid range is 200.00 to -200.00.
Word Control word 3: A value written to a user-configurable parameter on the
drive. You must configure this on the drive. (optional parameter)
Word Control word 4: A value written to a user-configurable parameter on the
drive. You must configure this on the drive. (optional parameter)
Word Control word 5: A value written to a user-configurable parameter on the
drive. You must configure this on the drive. (optional parameter)
Word Control word 6: A value written to a user-configurable parameter on the
drive. You must configure this on the drive. (optional parameter)
Word Control word 7: A value written to a user-configurable parameter on the
drive. You must configure this on the drive. (optional parameter)
Word Control word 8: A value written to a user-configurable parameter on the
drive. You must configure this on the drive. (optional parameter)
Bool New data ready: When true, the bit indicates that the outputs contain
data from a new communication request.
Bool Error occurred: When true, this indicates that an error has occurred and
the STATUS output is valid. All other outputs are set to zero on an
error. Communication errors are only reported on the USS_PORT
instruction ERROR and STATUS outputs.
Word The status value of the request indicates the result of the scan. This is
not a status word returned from the drive.
Bool Run enabled: This bit indicates whether the drive is running.
Bool Drive direction: This bit indicates whether the drive is running forward.
Bool Drive inhibited: This bit indicates the state of the inhibit bit on the drive.
Bool Drive fault: This bit indicates that the drive has registered a fault. You
must fix the problem and then set the F_ACK bit to clear this bit when
set.
105BCommunication processor
12.4 Universal serial interface (USS) communication
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