Axis, Drive And Encoder - Siemens simatic et 200s Operating Instructions Manual

4.6.2

Axis, Drive and Encoder

Quadruple evaluation of the encoder signals
The 1PosInc/Analog evaluates the pulses supplied by the incremental encoder and adds
them together to obtain the actual value. You must take the quadruple evaluation into
account when you make settings for paths in the parameters and in the control and feedback
interfaces:
1 pulse of the incremental encoder corresponds to 4 increments of the 1PosInc/Analog.
The current value is in the operating range 0 - 16 777 215 increments. The 1PosInc/Analog
generates an overflow or underflow of the actual value in the operating range at the limits of
the operating range.
Reversal of the Direction of Rotation of the Encoder Signals
You can use the parameter for the reversal of the direction of rotation to adapt the direction
of rotation of the encoder to that of the drive and the axis.
Controlling the Drive
You assign parameters how the drive is to be controlled using the Function DO parameter.
If you select Output, the following applies: The control is bipolar. The drive is controlled using
the analog output QV+/M
You can read the status of the OUT digital output from the feedback interface, with a delay
that corresponds to the updating rate.
Figure 4-7
If you select Direction, the following applies: The control is unipolar. The drive is controlled
using the analog output QV+/M
The 1PosInc/Analog controls the direction using the OUT digital output.
ET 200S Positioning
Operating Instructions, 05/2007, A5E00124871-04
±10 V to +10 V. You can use the digital output OUT as you wish.
ana
Schematic Diagram of the Bipolar Control of a Drive
with 0 V to +10 V.
ana
1PosInc/Analog
4.6 Functions of the 1PosInc/Analog
129