West Control Solutions DataVU 5 - Manual (Page 17)

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2 Device description
Counters
Counter inputs Any of the digital signals can be used as input signals for the counters.
v Chapter 2.4 “Digital signals (event traces)”
Example:
- binary inputs
- logic channels
- alarms
- memory alarms
- Modbus flag (signal via interface)
Counter
frequency 30Hz max.
Evaluation The count pulses can be evaluated (weighted). A down counter can be
implemented by entering a negative weighting (e.g. weighting factor -1).
Each count change can be documented with an entry in the event list. The
new count is attached to the message.
Integrators
Integrator
inputs Analog inputs 1 — 3 or 1 — 6 and math channels 1 — 6
Integrator
time base sec, min, hr and day
Evaluation You can also enter a weighting for the integrators.
Weighting
example - measurement of flow volume
- input signal of 0 — 20mA (corresponds to 0 — 500 liters/sec)
- time base 1sec
- weighting 0.001
Result: display of the integration value (volume) in m³.
Minimum size
of the input
signal Entering a threshold value (amount of the threshold value) has the effect that
integration takes place only when the value has been exceeded. No
integration will occur on falling below this value. The advantage of integration
with a threshold value larger than 0 is that possible noise from a transducer
can be suppressed in this way.
H
If there is an overrange or underrange on an integrator input, then
integration is stopped (the latest valid value is retained), and will
only continue when the input signal is correct again.