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Function Modules
You can read the current count in the STEP 5 program. The actual value is displayed as a signed
whole number in two's complement and lies in the range - 32768 to +32767.
Note
Before you enable the outputs to be switched on by setting the enable input to "1",
make sure the following conditions exist:
•
Both setpoints were transferred.
•
The overflow bit=0.
•
The SYNC bit=1.
If you ignore these prerequisites, the outputs are switched on directly when the actual
value=0.
The diagnostic bit and the output are reset with the "0" signal at the enable input. Outputs Q 0 and
Q 1 are also reset when the programmable controller goes from RUN to STOP.
The following examples show the switching on of the output at the selected setpoint. There are
three possibilities:
•
Reaching the setpoint in the direction of a rising actual value
•
Reaching the setpoint in the direction of a falling actual value
•
Reaching the setpoint in the direction of a rising actual value, then a reversal of direction and a
reapproaching of the setpoint in the opposite direction
Example 1:
Approaching a Setpoint in Up-Count Direction
Enable input
Output,
diagnostic bit
setpoint reached
Example of
1000
actual value
Figure 15-22. Approaching a Setpoint in Up-Count Direction
•
Actual value=1000: The enable input is set to "1".
•
Actual value=3000: The setpoint is reached, output and diagnostic bit "setpoint reached" are
set.
•
Actual value=6000: The enable input is set to "0", output and diagnostic bit are reset.
.
EWA 4NEB 812 6120-02
Setpoint
2000
3000
4000
Direction of traverse
5000
6000
S5100U
7000
15-35
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