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The behavior of the digital outputs can be configured before operation or by means of a control
command during operation.
DO1/DO2 in output mode
In output mode, the outputs can be set and reset via the process output/control interface. This
requires that the relevant output is released (CTRL_DO1, CTRL_DO2). Set/reset (SET_DO1, SET_DO2)
can then be carried out irrespective of the counter status.
Measurement mode
An upper and lower measuring limit can be set on the counter module
In measurement mode only the physical output DO1 is active.
The following functions can be selected:
Output (no switching when upper/lower measuring limit reached)
Measured value outside of the set limits
Measured value below the lower limit
Measured value above the upper limit
Releasing the output
Control bit CTRL_DO1 is used to release the output.
Control bit SET_DO1 is used to activate or deactivate the released output.
The status of the output is stored in the check-back interface/process input and can be scanned with
the status bit (STS_DO1).
12.1.12 Hysteresis for digital output DO1/DO2
In count mode, the hysteresis controls the switching of the outputs DO1/DO2 with comparisons.
A sensor may stand still at a specified position and ”oscillate” around this position. This condition
will cause the counter status to fluctuate by a specified value. If the reference value RV1/RV2 is
within this fluctuation range, this would mean that the DO1/DO2 output would switch on and off in
time with the fluctuating signal.
A programmable hysteresis function can therefore be used in order to prevent switching resulting
from small fluctuations. This hysteresis can be set between 0 and 255 (0 means Hysteresis switched
off).
The hysteresis can also be changed using the LOAD_DO_PARAM control command.
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