Siemens SIMATIC S5-90U System Manual page 505

S5-90U/S5-95U
Example 2: Approaching a Setpoint in Down-Count Direction
Enable
input
Output,
diagnostic bit
setpoint
reached
Example of
1000 2000
actual value
Figure 16-24. Approaching a Setpoint in Down-Count Direction
• With actual value = 7000, the enable input is set to "1".
• With actual value = 3000, the setpoint is reached, the output and the diagnostic bit "setpoint
reached" are set.
• With 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
setpoint
Direction of traverse
reached
Example of
1000 2000
actual value
Figure 16-25. Approaching a Setpoint in Up-Count Direction and
• With actual value=1000, the enable input is set to "1".
• With actual value=3000, the setpoint is reached, the output and the diagnostic bit "setpoint
reached" are set.
• With actual value=4500, the traversing path is reversed.
• With 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.
EWA 4NEB 812 6115-02b
Direction of traverse
Setpoint
3000 4000 5000
Direction of traverse
Setpoint
Change of direction
3000 4000 5000
Consecutive Reversal of Direction
Function Modules
6000 7000
6000 7000
16-37