Siemens SIMATIC S7-1200 System Manual page 1241
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Table 13- 122 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, V4.2, 09/2016, A5E02486680-AK
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 causes 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 con-
figured 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 in-
struction 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.
Communication processor and Modbus TCP
13.7 Legacy USS communication (CM/CB 1241 only)
1241
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