Siemens SIMATIC S5-100U System Manual page 450

Function Modules
Example 2: Approaching a Setpoint in Down-Count Direction
Enable input
Output,
diagnostic bit
setpoint reached
Example of
1000
actual value
Figure 15-23. Approaching a Setpoint in Down-Count Direction
• Actual value=7000: The enable input is set to "1".
• Actual value=3000: The setpoint is reached, the output and the diagnostic bit "setpoint
reached" are set.
• Actual value=1000: The enable input is set to "0", the output and the diagnostic bit are reset.
Example 3: Reversal of Direction after Approaching a Setpoint
Enable input
Output,
diagnostic bit
Direction of traverse
setpoint reached
Example of
1000
actual value
Figure 15-24. Approaching a Setpoint in Up-Count Direction and
• Actual value=1000: The enable input is set to "1".
• Actual value=3000: The setpoint is reached, the output and the diagnostic bit "setpoint
reached" are set.
• Actual value=4500: The traversing path is reversed.
• Actual value=1000: The enable input is set to "0", the output and the diagnostic bit are reset.
Note
Set outputs can be reset only via a "0" signal to the enable input.
15-36
Direction of traverse
Setpoint
2000 3000 4000
Direction of traverse
Setpoint
Change of direction
2000 3000 4000
Consecutive Reversal of Direction
5000 6000 7000
5000 6000 7000
EWA 4NEB 812 6120-02b
S5100U