Communication processor and Modbus TCP
13.4 Universal serial interface (USS) communication
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
1155
Table 13- 45 Data types for the parameters
RUN IN 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).
OFF2 IN Bool Electrical stop bit: When false, this bit causes the drive to coast to a
OFF3 IN 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.
F_ACK IN 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.
DIR IN Bool Drive direction control: This bit is set to indicate that the direction is
forward (for positive SPEED_SP).
DRIVE IN USInt Drive address: This input is the address of the USS drive. The valid
range is drive 1 to drive 16.
PZD_LEN IN 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.
SPEED_SP IN Real Speed set point: This is the speed of the drive as a percentage of con-
figured frequency. A positive value specifies forward direction (when
DIR is true). Valid range is 200.00 to -200.00.
CTRL3 IN Word Control word 3: A value written to a user-configurable parameter on the
drive. You must configure this on the drive. (optional parameter)
CTRL4 IN Word Control word 4: A value written to a user-configurable parameter on the
drive. You must configure this on the drive. (optional parameter)
CTRL5 IN Word Control word 5: A value written to a user-configurable parameter on the
drive. You must configure this on the drive. (optional parameter)
CTRL6 IN Word Control word 6: A value written to a user-configurable parameter on the
drive. You must configure this on the drive. (optional parameter)
CTRL7 IN Word Control word 7: A value written to a user-configurable parameter on the
drive. You must configure this on the drive. (optional parameter)
CTRL8 IN Word Control word 8: A value written to a user-configurable parameter on the
drive. You must configure this on the drive. (optional parameter)
NDR OUT Bool New data ready: When true, the bit indicates that the outputs contain
data from a new communication request.
ERROR OUT 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_Scan
instruction ERROR and STATUS outputs.
STATUS OUT Word The status value of the request indicates the result of the scan. This is
not a status word returned from the drive.
Run enabled: This bit indicates whether the drive is running.
Drive direction: This bit indicates whether the drive is running forward.
Drive inhibited: This bit indicates the state of the inhibit bit on the drive.
FAULT OUT 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
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