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Lead Contents


OMRON provides Preset Counters, Totalizing Counters, Time Counters and Electromagnetic Counters.

Overview Features
Principles Classifications
Engineering Data Further Information

Related Contents

Primary Contents

Counter Glossary

Electronic Counter

A counter which mainly consists of transistors, ICs, micro-computers,etc.

Electronic Counter_Circuit

Electromagnetic Counter

A counter which performs counting by energizing or de-energizing the built-in electromagnet.

Preset Counter

A counter whose control output operates when it counts up to a set value.


Totalizing Counter

A counter which indicates the total value of the counting inputs and is not provided with a control output.

Addition (Up/Incrementing) Counter


Subtraction (Down/Decrementing) Counter

A counter with a subtract input and thus capable of counting in descending order.


Up/Down Counter

A counter with the capability of counting in an ascending or descending order, depending on the up-down inputs. Also called a reversible counter.


Maximum Counting Speed

The maximum counting speed at which the display or output section of the counter operates accurately without miscounting. The maximum counting speed is expressed in units of counts per second (cps).

ON/OFF Ratio

The ratio of the ON signal time of a given input signal to the OFF signal time of the same input signal. The maximum counting speed of each counter is determined by a counting input signal with an ONOFF ratio of 1:1.

ON_OFF Ratio_diagram

Operating Mode

Control output patterns or display patterns that appear when counted up to the value set by the preset counter.


N Mode


C Mode


Note:Refer to the description of each product for information on operation in other modes.


Number of preset values that correspond with the number of control outputs.

Example: Two-stage Counter


Number of Digits

The maximum number of countable digits.

Display Method

The type of element used to display the counting results.

LED: Light emitting diode

LCD: Liquid crystal display

Note:Electromagnetic counters display results using a revolving mechanism with printed characters.

Externally Supplied Power

Power supplied from the counter to sensors that are used for counting or resetting. (Also called sensor power.)


To restore the counting, display and output sections of the counter, to their initial states.

Power Reset

To reset the counter by cutting off the operating supply voltage.

External Reset

To reset the counter by applying a specific signal to the reset input signal terminal.

Auto Reset

To reset the counter automatically with a signal generated from inside the counter.


To reset the counter by a signal generated by internal circuitry.

Manual Reset

To mechanically reset the counter by manual means.

Electromagnetic Reset

To electromagnetically reset the counter by applying a reset signal.

Counting Function

Refer to the following timing charts for the input modes of incremental, decrementing, and up/down (or reversible) Counters.
(These charts focus on the up/down input mode.).

Up/Down A Command Input

A Command Input diagram

Up/Down B Command Input

B Command Input diagram

Up/Down C Quadrature Input

C Quadrature Input diagram

Up/Down D Command Input

D Command Input diagram

Up/Down E Individual Input

E Individual Input diagram

Up/Down F Quadrature Input


Reference Material for Counters: Inrush Current

"---" indicates a constant current and therefore the corresponding values are omitted from the table. All the values are approximate values and should therefore only be used as a guide.

ModelVoltageApplied voltageInrush current
(peak value)
Time (see note)
H7AN series100 to 240 VAC264 VAC23 A1 ms
12 to 24 VDC26.4 VDC15 A4 ms
H7BX series100 to 240 VAC264 VAC7.6 A2 ms
24 VAC/12 to 24 VDC26.4 VAC13.5 A2 ms
H7CN series100 to 240 VAC264 VAC800 mA1 ms
12 to 48 VDC52.8 VDC400 mA1 ms
H7E series------------
H7CX-A[]-N series100 to 240 VAC264 VAC4.9 A0.9 ms
24AC/12 to 24 VDC26.4 VAC9.3 A1.4 ms
26.4 VDC6.2 A1.7 ms
H7CX-A[]D-N series24AC/12 to 24 VDC26.4 VAC9.2 A1 ms
26.4 VDC6.3 A1 ms
H7CX-A series (previous models)100 to 240 VAC264 VAC5.8 A0.7 ms
24 VAC/12 to 24 VDC26.4 VAC10.4 A1.2 ms
12 to 24 VDC26.4 VDC6 A1.2 ms
H7CX-R series (previous models)100 to 240 VAC264 VAC5.8 A0.7 ms
24 VAC/12 to 24 VDC26.4 VAC10.4 A1.2 ms
H7CZ series100 to 240 VAC264 VAC4.6 A0.4 ms
AC24/12 to 24 VDC26.4 VAC9.2 A1 ms
26.4 VDC6.3 A1 ms
H8BM-R series24 VDC26.4 VDC1.6 A12 ms

Note:The time of the inrush current is measured as shown in the following figure.

Time_of_inrush_current _fig