h7cx-a11d1 Omron Corporation, h7cx-a11d1 Datasheet - Page 32

• Manufacturer Part Number: h7cx-a11d1
• Description: Multifunction Preset Counter
• Manufacturer: Omron Corporation

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 35.)
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.
1. Displaying Rotation Rate
N: Number of pulses per revolution
Example:In order to display the rate of rotation for a machine that
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.
rpm
rps
m/min
m/s
Displayed value = f × a
f: Input pulse frequency (number of pulses in 1 second)
a: Prescale value
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 =
Display unit
Display unit
60/5 = 12.
1/N × 60
1/N
πd × 1/N × 60
πd × 1/N
Prescale value (a)
Prescale value (a)
d: Diameter of
rotating body
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.
Note: Set the auto-zero time to a time slightly longer than the estimat-
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 Input Connections
on page 11.
Display Color (colr)
Set the color used for the measurement value.
Note: 1. If the tachometer output mode is set to AREA, however, the
red
grn
r-g
(See note
1.)
g-r
(See note
2.)
Setting
ed interval between input pulses and within the setting range
(0.1 to 99.9 s). It will not be possible to make accurate mea-
surements 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.
2. 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.
measured value is displayed in green when control output 1
is OFF and in red when control output 1 is ON.
Red (fixed)
Green (fixed)
Measured value displayed
in red when both control
outputs 1 and 2 are OFF.
Measured value displayed
in green when both control
outputs 1 and 2 are OFF.
Power supply
Comparison
value
(lower limit)
Output
(lower limit)
Control output OFF
Display
Startup time
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.
Control output ON
H7CX-A
Time
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