Digital Inputs/Output Setup - Hydronix Hydro-Probe XT User Manual

Configuration

3 Digital inputs/output setup

The sensor has two digital inputs/output; the first can be configured as an input only. The
second can be either an input or output.
The first digital input can be set to the following:
Unused:
Average/Hold
Moisture/Temperature:
The second digital input/output can also be set to the following outputs:
Bin Empty:
Data Invalid:
ProbeOK:
An input is activated using 15 – 30V DC into the digital input connection. The sensor
power supply may be used as an excitation supply for this, or alternatively an external
source may be used as in Figure 24.
The status of the input is ignored
This is used to control the start and stop period for batch
averaging. When the input signal is activated, the 'Raw' values
(Unscaled and moisture) start to average (after a delay period set
by the 'Average/Hold delay') parameter. When the input is then
deactivated, averaging is stopped and the average value is held
constant so that it can be read by the batch controller PLC. When
the input signal is activated once again, the average value is reset
and averaging commences.
Allows the user to switch the analogue output between the
Unscaled or moisture (whichever is set) and temperature. This is
used when the temperature is required whilst still using only one
analogue output. With the input active, the analogue output will
indicate the appropriate moisture variable (Unscaled or moisture).
When the input is activated, the analogue output will indicate the
material temperature (in degrees centigrade).
Temperature scaling on the analogue output is fixed – zero scale
(0 or 4mA) corresponds to 0°C and full scale (20mA) to 100°C.
This output is energised if the Unscaled value goes below the Low
Limits defined in the Averaging section. This can be used to signal
to an operator when the sensor is in air (as the sensor's value goes
to zero in air) and can indicate a vessel empty state.
This output is energised if the Unscaled value goes outside of any
of the limits defined in the averaging section. This may be used to
provide a high and low level alarm.
This option is not used for this sensor.
Hydro-Probe XT User Guide HD0538 Rev: 1.6.0 37
Chapter 4