Siemens SIMATIC ET 200S - Axis, Drive and Encoder; Figure 3-7 Digital Outputs with Control Mode 0

1PosInc/Digital
3.6 Functions of the 1PosInc/Digital
ET 200S Positioning
Operating Instructions, 05/2007, A5E00124871-04
67
3.6.2 Axis, Drive and Encoder
Quadruple evaluation of the encoder signals
The 1PosInc/Digital evaluates the pulses delivered by the incremental encoder four times
and adds them up to form 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/Digital.
The current value is in the operating range 0 - 16 777 215 increments. The 1PosInc/Digital
generates an overrun or underrun of the actual value 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
The drive is controlled using the 3 digital outputs of the 1PosInc/Digital.
You can select the speed with the SPEED control bit (SPEED=0 is creep feed; SPEED=1 is
rapid feed). You can also change the speed during the run.
You can bring about a change in direction with the T
min
direction change parameter.
You can read the status of each output from the feedback interface (DO0, DO1 and DO2).
The function of the digital outputs depends on the control mode.






$FWXDOVSHHG
5DSLGIHHG
&UHHSIHHG
VWDUWSRVLWLRQ 6ZLWFKRYHU
SRLQW
6ZLWFKRII
SRLQW
'HVWLQDWLRQ
3DWK
SOXV
'2
7UDYHOPLQXV
'2
7UDYHOSOXV
'2
5DSLGFUHHSIHHG
Figure 3-7 Digital Outputs with Control Mode 0