13
21
17
22
23
24
25
26
27
28
26
19
24
5. FREQUENCY METER / TACHOMETER CONFIGURATION
INPUTS
In frequency/tachometer mode both inputs of the meter
are used. The signal providing frequency/rate and count
information must be issued to the A input. A second
signal may be applied to the B input to control direction
of rotation or polarity of the signal.
MEASURE
The method of calculating rate is based in measuring
the period of the signal, that is, the time elapsed
between two consecutive rising edges. The period is
converted into a high precision frequency value and
scaled to read desired units.
DISPLAY
The meter allows the user to change some parameters
to fit the particular application needs, such as to reduce
or extend the number of signal cycles of each reading,
the time limit, the display rate and averaging (see
"Options of the Process Variable" in pages 29 and 30).
TOTALIZER
If enabled, the totalizer accumulates the number of
pulses received at the input providing two simultaneous
information for example flow rate and product quantity
for a given process.
DIRECTION OF ROTATION INDICATION
Direction sensing indication is a matter of simply setting
the totalizer to read UP/DOWN direction (modes PHASE
and dIrEC).
The direction of rotation is denoted by the LED's MAX
and MIN on the left of the display. LED MAX illuminates
when the totalizer counts in the up direction, so it can
be associated to a "positive" rate.
LED MIN illuminates when the totalizer counts down,
which may be associated to a "negative" rate.
A change in the polarity of rate is recognized when the
meter receives at least two consecutive pulses in the
opposite direction of the one of the previous pulses.
13
21
17
22
23
24
25
26
27
28
26
19
24
5. FREQUENCY METER / TACHOMETER CONFIGURATION
INPUTS
In frequency/tachometer mode both inputs of the meter
are used. The signal providing frequency/rate and count
information must be issued to the A input. A second
signal may be applied to the B input to control direction
of rotation or polarity of the signal.
MEASURE
The method of calculating rate is based in measuring
the period of the signal, that is, the time elapsed
between two consecutive rising edges. The period is
converted into a high precision frequency value and
scaled to read desired units.
DISPLAY
The meter allows the user to change some parameters
to fit the particular application needs, such as to reduce
or extend the number of signal cycles of each reading,
the time limit, the display rate and averaging (see
"Options of the Process Variable" in pages 29 and 30).
TOTALIZER
If enabled, the totalizer accumulates the number of
pulses received at the input providing two simultaneous
information for example flow rate and product quantity
for a given process.
DIRECTION OF ROTATION INDICATION
Direction sensing indication is a matter of simply setting
the totalizer to read UP/DOWN direction (modes PHASE
and dIrEC).
The direction of rotation is denoted by the LED's MAX
and MIN on the left of the display. LED MAX illuminates
when the totalizer counts in the up direction, so it can
be associated to a "positive" rate.
LED MIN illuminates when the totalizer counts down,
which may be associated to a "negative" rate.
A change in the polarity of rate is recognized when the
meter receives at least two consecutive pulses in the
opposite direction of the one of the previous pulses.
