Siemens SINAMICS S120 Commissioning Manual page 187

Determining the drive direction
The direction of the drive is positive, if when viewing the DE flange, the rotor is rotating
clockwise.
Figure 2-53
Determining the counting direction of the measuring system
The counting direction depends on the measuring system and the mounting position. The
counting direction of the measuring system must match the direction of rotation of the motor.
If necessary, you must adapt the counting direction by making the appropriate parameter
assignment. Please refer to the manufacturer's documentation for the measuring system. If
necessary, you must invert the counting direction as described in Figure 2-52 Screen form
for entering additional encoder data (Page 184).
Note
Checking the measuring system counting direction
The measuring system counting direction can also be checked, by first parameterizing the
drive, and then manually rotating it with the enable signals inhibited.
If the axis is rotated in the positive direction, the actual speed value must also count in the
positive direction.
See also
Parameterizing a motor and encoder (Page 173)
Commissioning Manual
Commissioning Manual, (IH1), 01/2013, 6SL3097-4AF00-0BP3
2.13 Commissioning SIMOTICS 1FW6 built-in torque motors
Determining the positive direction of the drive
Commissioning
185