H7CX-ASD datasheet(34/43 Pages) OMRON

34 / 43 page

C-120

Multifunction Preset Counter

H7CX (Tachometer Function)

Explanation of Functions

Tachometer Output Mode (totm) (Setting possible using

DIP switch.)

Set the output method for control output based on the OUT1/OUT2

set value. Upper and lower limit (HI-LO), area (AREA), upper limit

(HI-HI), and lower limit (LO-LO) can be set. (For details on the opera-

tion of the output modes, refer to Output Mode Settings on

page 123.)

Counting Speed (cnts) (Setting possible using DIP

switch.)

Set the maximum counting speed (30 Hz/10 kHz) for CP1 input. If

contacts are used for input signals, set the counting speed to 30 Hz.

Processing to eliminate chattering is performed for this setting.

Decimal Point Position (dp)

Decide the decimal point position for the measurement value, OUT1

set value, and OUT2 set value.

Prescale Value (pscl)

It is possible to display the rate of rotation or the speed of a device or

machine to which the H7CX is mounted by converting input pulses to

a desired unit. If this prescaling function is not used, the input fre-

quency (Hz) will be displayed.

The relationship between display and input is determined by the fol-

lowing equation. Set the prescale value according to the unit to be

displayed.

Displayed value = f

× a

f: Input pulse frequency (number of pulses in 1 second)

a: Prescale value

1. Displaying Rotation Rate

N: Number of pulses per revolution

Example:In order to display the rate of rotation for a machine that

outputs 5 pulses per revolution in the form

@@.@ rpm:

1. Set the decimal point position to 1 decimal place.

2. Using the formula, set the prescale value to 1/N

× 60 =

60/5 = 12.

2. Displaying Speed

N: Number of pulses per revolution

d: Diameter of rotating body (m)

πd: Circumference (m)

Average Processing (aug) (Setting possible using DIP

switch.)

Flickering display and output chattering can be prevented using aver-

age processing (simple averaging). Average processing can be set to

one of four levels: no average processing, 2 times (i.e., the average

of 2 measurement values), 4 times, or 8 times. The measurement

cycle will be equal to the sampling cycle (200 ms) multiplied by the

average processing setting (i.e., the number of times). Average pro-

cessing enables fluctuating input signals to be displayed stably. Set

the optimum number of times for the application.

Auto-zero Time (aut=)

It is possible to set the H7CX so that if there is no pulse for a certain

time the display is force-set to 0. This time is called the auto-zero

time. Set the auto-zero time to a time slightly longer than the esti-

mated interval between input pulses and within the setting range (0.1

to 99.9 s). It will not be possible to make accurate measurements if

the auto-zero time is set to a time shorter than the input pulse cycle.

Setting a time that is too long may also result in problems, such as a

time-lag between rotation stopping and the alarm turning ON.

Startup Time (stmr)

In order to prevent undesired output resulting from unstable input

immediately after the power supply is turned ON, it is possible to pro-

hibit measurement for a set time (0.0 to 99.9 s), the startup time. It

can also be used to stop measurement and disable output until the

rotating body reaches the normal rate of rotation, after the power

supply to the H7CX and rotating body are turned ON at the same

time.

NPN/PNP Input Mode (imod)

Select either NPN input (no-voltage input) or PNP input (voltage

input) as the input format. The same setting is used for all external

inputs. For details on input connections, refer to The circuit shown

above is for no-voltage input (NPN input). on page 96.

Display Color (colr)

Set the color used for the measurement value.

Note: 1. If the tachometer output mode is set to AREA, however, the

measured value is displayed in red when control output 1 is

OFF and in green when control output 1 is ON.

2. If the tachometer output mode is set to AREA, however, the

measured value is displayed in green when control output 1

is OFF and in red when control output 1 is ON.

Display unit

Prescale value (a)

rpm

1/N

× 60

rps

1/N

Display unit

Prescale value (a)

m/min

πd × 1/N × 60

m/s

πd × 1/N

d:Diameter of

rotating body

Setting

Control output OFF

Control output ON

red

Red (fixed)

grn

Green (fixed)

r-g

(See note

1.)

Measured value displayed

in red when both control

outputs 1 and 2 are OFF.

Measured value displayed

in green when either control

output 1 or control output 2

is ON.

g-r

(See note

2.)

Measured value displayed

in green when both control

outputs 1 and 2 are OFF.

Measured value displayed

in red when either control

output 1 or control output 2

is ON.

Startup time

Display

Power supply

Time

Output

(lower limit)

Comparison

value

(lower limit)

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