H7CX-ASD datasheet(17/43 Pages) OMRON

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Multifunction Preset Counter

H7CX

C-103

Precautions

!Caution

Do not use the product in locations subject to flammable or explo-

sive gases. Doing so may result in explosion.

The service life of the output relays depends on the switching

capacity and switching conditions. Consider the actual application

conditions and use the product within the rated load and electrical

service life. Using the product beyond its service life may result in

contact deposition or burning.

Do not disassemble, repair, or modify the product. Doing so may

result in electric shock, fire, or malfunction.

Do not allow metal objects or conductive wires to enter the product.

Doing so may result in electric shock, fire, or malfunction.

I External Power Supply

The capacity of the external power supply is 100 mA at 12 V. When

using a 24 VAC/12 to 24 VDC power supply, reduce the load with the

power supply voltage, as shown in the following diagram (DC power

supplies only).

I Power Supplies

When turning the power ON and OFF, input signal reception is possi-

ble, unstable, or impossible as shown in the diagram below.

Turn the power ON and OFF using a relay with a rated capacity of 10

A minimum to prevent contact deterioration due to inrush current

caused by turning the power ON and OFF.

Apply the power supply voltage through a relay or switch in such a

way that the voltage reaches a fixed value immediately, otherwise

they may not be reset or a counter error may result.

Be sure that the capacity of the power supply is large enough, other-

wise the counter may not start due to inrush current (reference value:

approx. 10 A, 1.2 ms at 26.4 VAC) that may flow for an instant when

the counter is turned ON.

Make sure that the fluctuation of the supply voltage is within the per-

missible range.

Make sure that the voltage applied is within the specified range, oth-

erwise the internal elements of the counter may be damaged.

I Transistor Output

The transistor output of the H7CX is isolated from the internal cir-

cuitry by a photocoupler, so the transistor output can be used as both

NPN and PNP output.

The diode connected to the collector of the output transistor is used

to absorb inverted voltage that is generated when an inductive load is

connected to the H7CX.

I Changing the Set Values

When changing the set value during operation, because the H7CX

uses a constant read-in system, output will turn ON if the set value is

equal to the present value.

I Operation with a Set Value and

Present Value of 0

If the set value and present value are both 0, output will turn ON.

Output will turn OFF during reset.

I Using the Prescaling Function

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.

Note: Output will turn ON, however, if a present value overflow occurs

(FFFFFF or FFFF).

• Setting the prescale value incorrectly may result in incorrect count-

ing operation. Be sure to set the prescale value correctly.

I DIP Switch Setting

Ensure that the power is turned OFF before changing DIP switch set-

tings. Changing DIP switch settings with the power turned ON may

result in electric shock due to contact with terminals subject to high

voltages.

I Power Failure Backup

All data is stored in the EEPROM when there is power failure. The

EEPROM can be overwritten more than 100,000 times. EEPROM is

overwritten when the power is turned OFF or when settings are

changed.

10.8

100

Power

pply vol age

(DC v ltage

ppl only)

200 ms

5 ms

OFF

Input

Impossible

Unstable

Possible

Unstable

Impossible

0 to 1 s

0 to 90 ms

Power

supply

Power for load

Load

NPN output

PNP output

Counter

Power for load

Inductive load

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