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參數(shù)資料
| 型號： | H7CX-AU |
| 廠商： | Omron Electronics LLC |
| 元件分類： | 通用總線功能 |
| 英文描述： | Multifunction Preset Counter |
| 中文描述： | 多功能預(yù)置計(jì)數(shù)器 |
| 文件頁數(shù)： | 34/43頁 |
| 文件大?。?/td> | 2361K |
| 代理商： | H7CX-AU |
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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)
π
d: 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)
1/N
×
60
1/N
rpm
rps
Display unit
Prescale value (a)
π
d
×
1/N
×
60
π
d
×
1/N
m/min
m/s
d:Diameter of
rotating body
Setting
red
grn
r-g
(See note
1.)
Control output OFF
Red (fixed)
Control output ON
Green (fixed)
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.
Measured value displayed
in red 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.
Startup time
Display
Power supply
Time
Output
(lower limit)
Comparison
value
(lower limit)
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