Siemens Simatic S7-200 System Manual page 259

Editing the Default Input and Output Configurations
The Position Control wizard provides an Advanced Options selection that allows you to view and edit the
default input and output configurations for the Position module:
-
The Input Active Levels tab changes the activation level settings. When the level is set to High, a
logic 1 is read when current is flowing in the input. When the level is set to Low, a logic 1 is read
when there is no current flow in the input. A logic 1 level is always interpreted as meaning the
condition is active. The LEDs are illuminated when current flows in the input, regardless of
activation level. (Default = active high)
-
The Input Filter Times tab allows you to specify a delay time (range of 0.20 ms to 12.80 ms) for
filtering the STP, RPS, LMT+, and LMT– inputs. This delay helps to filter noise on the input wiring
that could cause inadvertent changes to the state of the inputs. (Default = 6.4 ms)
-
The Pulse and Directional Outputs tab allows you to specify the method of controlling direction. First
you must specify the polarity of the outputs.
Selecting Positive Polarity
For an application that uses positive polarity, select one of the following methods (shown in Figure 9-3) to
accommodate your drive and the orientation of your application:
-
The Position module emits pulses from the P0 output for positive rotation and pulses from the P1
output for negative rotation.
-
The Position module emits pulses from the P0 output. The module turns on the P1 output for
positive rotation and turn off the P1 output for negative rotation. (This is the default setting.)
Positive Rotation
P0
P1
Figure 9-3 Rotation Options for Positive Polarity
Selecting Negative Polarity
For an application that uses negative polarity, select one of the following methods (shown in Figure 9-4) to
accommodate your drive and the orientation of your application:
-
The Position module emits pulses from the P0 output for negative rotation and pulses from the P1
output for positive rotation.
-
The Position module emits pulses from the P0 output. The module turns off the P1 output for
positive rotation and turn on the P1 output for negative rotation.
Positive Rotation
P0
P1
Figure 9-4 Rotation Options for Negative Polarity
Creating a Program for the Position Module
Negative Rotation
P0
P1
Negative Rotation
P0
P1
Positive Rotation Negative Rotation
Positive Rotation Negative Rotation
Chapter 9
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