H7CX-R11W-N datasheet(45/56 Pages) OMRON

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H7CX-R

@-N

Explanation of Functions

Basic Functions

Input Mode

The mode can be switched between tachometer mode and AMD-

compatible mode.

Tachometer Mode

Use this mode to measure the pulse frequency (Hz).

AMD-compatible Mode

Use this mode to measure the pulse cycle (s).

Counting Speed

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

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

Processing to eliminate chattering is performed for this setting.

Output Mode

Set the output method for control output based on the comparison

value.

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

lower limit (LO) can be set. For the H7CX-RW

@, the upper limit (HI-

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

of the output modes, refer to Output Mode Settings on page page 49.)

Averaging Method (

avgt)

Simple averaging or a moving average can be selected for the

averaging method.

With a moving average, the average measurement value is displayed

every sampling cycle or pulse cycle, in contrast to simple averaging,

for which the average value is displayed for the set number of

samples.

Number of Averaging Times

Flickering display and output chattering can be prevented using

average processing. 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.

For a measurement frequency of 5 Hz or higher using a tachometer,

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

the averaging setting (i.e., the number of times).

For less than 5 Hz, the frequency will be measured when the input

pulse comes. Average processing produces a stable display even for

fluctuating input signals. Set the optimum number of times for the

application.

If AMD-compatible mode is used, the measurement cycle will be

measured when the input pulse is received. The output will change,

however, when the comparison value is exceeded even if averaging

is enabled.

NPN/PNP Input Mode

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

input) as the input format. When using a two-wire sensor, select NPN

input.

The same setting is used for all external inputs.

For details on input connections, refer to Input Connections on page

page 40.

Advanced Functions

Decimal Point Position (

dp)

Decide the decimal point position for the measurement value and

comparison 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 the default prescaling value (1,000) is used, the input frequency

(Hz) will be displayed.

The relationship between display and input is determined by the

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

displayed.

Displayed value = f

× α

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

α: 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 places.

2. Using the formula, set the prescale value (

α) 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)

• Observe the following points when

setting a prescale value.

Set the set value to a value less than {Maximum countable value

− Prescale value}.

Example: If the prescale value is 1.25 and the counting range is

0.000 to 999.999, set the set value to a value less than 998.749

(= 999.999

− 1.25).

If the set value is set to a value greater than this, output will not turn

ON.

Auto-zero Time (

auto0)

It is possible to make the settings so that the frequency will be force-

set to 0 if there is no pulse for a specified period of time. This time is

called the auto-zero time.

Cycle (s)

Display unit

Prescale value (

α)

rpm

1/N

× 60

rps

1/N

Display unit

Prescale value (

α)

m/min

πd × 1/N × 60

m/s

πd × 1/N

d: Diameter

of rotating

body (m)

Note: If the prescale value setting is incorrect, a counting error will

occur. Check that the settings are correct before using this

function.

Note: Set the auto-zero time to a time slightly longer than the

estimated interval between input pulses. 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.

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