Siemens SIMATIC S7-200 System Manual page 282

S7-200 Programmable Controller System Manual
Edit default input and output configuration
To change or view the default configuration of the integrated inputs/outputs select the Advanced
Options button.
Use the Input Active Levels tab to select the active level (High or Low). 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)
Use the Input Filter Times tab to select the filter time constant (0.20 ms to 12.80 ms) for the
-
STP, RPS, LMT+, and LMT-- inputs. Increasing the filter time constant eliminates more
noise, but it also slows down the response time to a signal state change. (Default = 6.4 ms)
Use the Pulse and Directional Outputs tab to select the polarity of the outputs and to select
-
the direction control method. See Figures 9-11 and 9-12 to see the effects of polarity and
direction control method selections.
Positive Rotation
P0
P1
Figure 9-11 Rotation Options for Positive Polarity
Positive Rotation
P0
P1
Figure 9-12 Rotation Options for Negative Polarity
Warning
Control devices can fail in unsafe conditions, and can result in unpredictable operation of
controlled equipment. Such unpredictable operations could result in death or serious personal
injury, and/or equipment failure.
The limit and stop functions in the Position Module are electronic logic implementations that do
not provide the level of protection provided by electromechanical controls. Consider using an
emergency stop function, electromechanical overrides, or redundant safeguards that are
independent of the Position module and the S7-200 CPU.
Configure response of module to physical inputs
Next, select the module response to the LMT+, the LMT--, and the STP inputs. Use the drop down
box to select: no action (ignore the input condition), decelerate to a stop (default), or immediate
stop.
Enter maximum start and stop speed
Enter the maximum speed (MAX_SPEED) and Start/Stop Speed (SS_SPEED) for your
application
268
Negative Rotation
Negative Rotation
Positive Rotation
P0
P1
Positive Rotation
P0
P1
Negative Rotation
² 0.5 ms
Negative Rotation
² 0.5 ms