Rockwell Automation 1771-CFM,D17716.5.99 CONFIGURABLE FLOWMET - Manual (Page 88)

Using I/O Configuration Software E–3
Publication 1771Ć6.5.99 - December 1995
Current values Displays In mode(s)
channel mode
the current channel mode as returned in the BTR data file by the module all
frequency
the current scaled frequency all
total counts
the scaled total counts T, NRT
acceleration
if acceleration alarm value
0 0, value = the acceleration (change in scaled frequency per second)
= 0, value = 0
all
Current programming You In mode(s)
new channel mode
press (F9) Ć Toggle to select a mode of operation for the input channel:
❯ not used
❯ totalizer
❯ noreset totzr
(nonresettable totalizer)
❯ high-res freq
(highĆresolution frequency)
❯ direction
(direction sensor)
Important: The HighĆresolution frequency and Direction Sensor modes each
occupy two channels and are selected via channel 0 (channel 1
unused) or channel 2 (channel 3 unused).
all
minimum sample time
for frequency
enter the minimum time value the CFM module will spend to determine frequency
RANGE: 4-1000ms (0Ć3 = DEFAULT)
DEFAULT (if you enter 0): 100ms (T, NRT) 4ms (HR, DS)
In Direction Sensor, this time is used to determine the maximum sample time and
minimum frequency and does not actually determine the time period.
T, NRT, HR
acceleration alarm
value
enter an alarm value of 0 to 32,767
DEFAULT (if you enter 0): all acceleration features of the module are disabled
all
accel sample time
(freq intervals)
only when the acceleration alarm value 0 0
enter a number to determine how many frequency intervals (1 to 750) should be
spanned in computing acceleration
DEFAULT (if you enter 0): acceleration calculated as rolling average over 5
samples
T, NRT, HR
highest allowed
frequency
enter a value up to 120,000Hz for the overspeed threshold
DEFAULT (if you enter 0): 120,000Hz
The highest allowed frequency is in Hz, not in scaled frequency units.
For example, if you select 120,000Hz as the highest allowed frequency and select
frequency scalers of 1/60, the module sets the overspeed bit in the BTR for any
scaled frequency above 2000 (120,000Hz).
T, NRT, HR
lowest measurable
frequency
press (F9) Ć Toggle to select 1 Hz (full frequency range, 1 Hz to 100kHz)
or 1/sample time Ċ this field = Bandwidth Limit in BTW configuration block
HR
end sample on
press (F9) Ć Toggle to select time only or time/counts (time only means when the
minimum sampling time has elapsed and at least one count has been received)
Ċ this field = Terminate Enable in BTW configuration block
HR
counts to end
sampling
enter the number of counts (0Ć32,767) to end sampling on HR
frequency resolution
select the precision of the frequency (1Hz or 0.1Hz) returned in the BTR
(if you have scaling programmed for frequency, the resolution will be in whole
numbers of tenths of scaled frequency units)
HR
frequency scalers
(multiply/divide)
enter a multiplier and divisor separated by a (/) to have the module report
frequency in units meaningful to your application
(the multiplier must be ≤ the divisor)
RANGE: 1Ć255 DEFAULT: 1/1 (no scaling)
For example, if one count represents 7 gallons, you could scale frequency to
gallons per minute by entering scalers of 7/60.
Scaling affects only the frequency and acceleration value that the module returns
in the BTR. All programming in the BTW Ć- e.g. highest allowed frequency, output
ON and OFF values still in Hz.
all
Mode abbreviations:
Totalizer = T Nonresettable Totalizer = NRT HighĆresolution Frequency = HR Direction Sensor = DS