Siemens SIMATIC ET 200S Operating Instructions Manual page 44

1Count24V
2.6 Count Modes
Controlling the Outputs Simultaneously with the Comparators
If you have selected a comparison function for the outputs, you can continue to control the
outputs with SET_DO1 or SET_DO2. This allows you to simulate the effect of the
comparison functions on your control program:
● The output is set with the positive edge of SET_DO1 or SET_DO2.
● A negative edge of SET_DO1 or SET_DO2 resets the output.
Note that the comparators are still active and can set or reset the output if the comparison
result changes.
Note
An output set by SET_DO1 or SET_DO2 is not reset by the comparator.
Loading Comparison Values
You transfer the comparison values to the 1Count24V. The counting is not affected by this.
Valid Range for the Two Comparison Values
Low counting limit
to
high counting limit
Modifying the Function and Behavior of Digital Outputs
You can modify the functions and behavior of the outputs during operation using the control
interface. The 1Count24V deletes the outputs and accepts the values as follows:
● Function of digital outputs DO1 and DO2: If you change this function so that the
● Hysteresis: An active hysteresis (see How Hysteresis Works) continues to be active
● Pulse duration: The new pulse duration takes effect with the next pulse.
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However, if the Pulse on Reaching the Comparison Value function is selected, only one
pulse with the specified duration is output. SET_DO1 and SET_DO2 have no effect when
pulse duration = 0.
The SET_DO1 control bit is not permitted with the Switch at Comparison Values output
behavior.
Main count direction:
None
comparison condition is satisfied, the output is not set until after the next count pulse.
However, if hysteresis is enabled, the 1Count24V does not make any changes at the
output.
following the change. The new hysteresis range is applied the next time the comparison
value is reached.
Main count direction:
Up
–2147483648
to
high counting limit –1
Operating Instructions, 06/2010, A5E00124867-07
Main count direction:
Down
1
to
2147483647
Technological Functions