7
You should notice the binary inputs are built in a way that enables the expansion of
their functionality. It means the counting input may simultaneously work as an alarm
input as well as a common binary input (if it has sense, of course).
The mode of input operation depends on its configuration.
3.2.2. Analog inputs
The MT-703 telemetry module has two analog inputs (AI) of voltage type marked as
AN1, AN2.
The inputs operate in 0 - 3.3 VDC voltage range. They convert an analog signal from
sensors powered by the 3.3 VDC voltages. These voltages are delivered by associated
powering outputs. To save the energy the converters are powered only within a time
period required for making a proper measurement.
The analog inputs of the module are not insulated. It has practically negligible influence
on the interference immunity, because the module is battery supplied (i.e., it has a
flowing potential).
Because the settling time of results on analog inputs is about 10 s, it means that the
inputs are not suitable for high-speed signal measurements.
3.2.3. Timers
The MT-703 telemetry module has two programmable timers used for different
purposes.
The Measuring timer (T1) is used for metering the measurement cycles defined by
switching the external sensors on/off. The sensors are powered from Vcc connectors.
During the measurement cycle the following measurements are carried out:
Testing the status of binary inputs
Signal measurements on analog inputs
Testing the alarms for analog inputs
Measurement of the supply voltage
Checking the low alarm for supply voltage
Computing increments of the counters content (if enabled)
Checking alarms for counters (if enabled)
Setting the flags according to the current state of the device
Processing the rules
To Next Page
Loading...
Need help?
General