Rockwell Automation 1771-CFM,D17716.5.99 CONFIGURABLE FLOWMET User Manual

Page 39

4–5

Configure the CFM Module

Publication 1771Ć6.5.99 - December 1995

Important: The Frequency Multiplier must be

≤

the Frequency Divisor.

Example: If Frequency Divisor = 50, Frequency Multiplier = 6 and frequency at the input = 75 Hz,

the scaled value returned will be 6/50(75) = 9

➀

When scaling is used, all outputs are still controlled by the actual value (in example, 75Hz) not the scaled value (in example, 9).

all

Highest Allowable Frequency Ċ the highest frequency allowed on the channel. When the specified frequency is

exceeded, the channel's overspeed alarm will activate. Also used to calculate Percent of Full Scale (BTR word 6,15,24,33).

RANGE: 0 Ć 32,767 DEFAULT: 0 (=120,000)

Used with the 4 x High Hertz (bit 12 of word 5, 15, 25, or 35) to have an effective range of 0Ć120,000.

all

Acceleration Alarm Value determines at what acceleration values (Hz/s) the BTR alarm bits are activated.

The alarm bits occur when the absolute value of the acceleration exceeds the Acceleration Alarm Value.

This word also determines whether acceleration is calculated. A value of 0 deactivates all acceleration calculations.

RANGE: 0 Ć 32,767 (0 disables)

all

Frequency Scaler Divisor Ċ the frequency value

returned in the BTR is divided by the specified value.

RANGE: 0Ć255

DEFAULT: 1

Frequency Scaler

➀

Multiplier Ċ the frequency value

returned in the BTR is multiplied by the specified value.

RANGE: 0Ć255

DEFAULT: 1

all

word 8 (channel 0)

word 18 (channel 1)

word 28 (channel 2)

word 38 (channel 3)

word 9 (channel 0)

word 19 (channel 1)

word 29 (channel 2)

word 39 (channel 3)

word 10 (channel 0)

word 20 (channel 1)

word 30 (channel 2)

word 40 (channel 3)

Number of Pulses to Terminate Sampling Ċ applied when Sampling Termination (bit 13 of word 5, 15, 25 or 35)

is set. Causes the sampling to cease when the specified number of input pulses are received or the

Minimum Frequency Sampling Time is exceeded, which ever occurs first. RANGE: 0Ć32,767
HighĆresolution Frequency

word 7 (channel 0)

word 17 (channel 1)

word 27 (channel 2)

word 37 (channel 3)