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Introduction Features
Principles Classifications
Engineering Data Further Information
Explanation of Terms Troubleshooting

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Primary Contents

Electronic Counter

A Counter which mainly consists of transistors, ICs, microcomputers, etc.

Electromagnetic Counter

A Counter that performs counting by energizing or deenergizing a built-in electromagnet.

Preset Counter

A Counter with a control output that operates when the Counter counts to a set value.

Total Counter

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

Addition (Up/Incrementing) Counter

A Counter having an add input and thus capable of counting in an ascending order.

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 and 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 counting an input signal with an ON/OFF ratio of 1:1.

Operating Mode

The control output patterns and display patterns that appear when a Preset Counter counts to the set value.

Mode N

Mode C

Note:Refer to the datasheets for individual products 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 that is 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 turning OFF the power 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.

Manual Reset

To mechanically reset the Counter by manual means.

Electromagnetic Reset

To electromagnetically reset the Counter by applying a reset signal.

Counting: Operation Method

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

Up/Down B Command Input

Up/Down C Quadrature Input

Up/Down D Command Input

Up/Down E Individual Input

Up/Down F Quadrature Input