# Counter

Instructions · `Counter` · verification: source checked

The Counter instruction counts up, down, or both in response to OFF-to-ON transitions of enabling rungs. It stores the current count in a register and turns on a completion bit when the count reaches the set point. A reset rung clears the completion bit.

## Specification

| Property | Value |
|---|---|
| Language | ladder |
| Code | Counter |
| Group | Counter |

### Parameters

| Name | Data type | Description |
|---|---|---|
| Counter Number | CT memory type | Assigns the counter number. |
| Set Point | Integer constant or DS/DD address | Target count value. |
| Count Type | selection | Count Up, Count Down, or Count Up & Down. |
| Current Value | Counter Data register | Holds the current count; automatically assigned from the counter number. |
| Completion Bit | CT bit | Turns ON when current value reaches the set point; same as counter number. |

## Study notes

- The counter number must be a CT memory type.
- Set Point can be an integer constant or a DS/DD data memory address.
- Count Type options are Count Up, Count Down, and Count Up & Down.
- Current Value is automatically assigned to the corresponding Counter Data register: CT1 corresponds to CTD1, CT2 to CTD2, etc.
- The Completion Bit is the same as the Counter Number.
- Count Up & Down uses two enabling rungs, one for up counts and one for down counts.
- The completion bit turns ON when the current value reaches the set point and turns OFF when the reset rung is enabled.

## Sources

1. [Related Topics:](https://cdn.automationdirect.com/static/helpfiles/click/Content/166.htm) (accessed 2026-10-26)

---

Source page: https://machineschema.com/instruction/click-counter  
JSON: https://machineschema.com/instruction/click-counter.json  
License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite Machine Schema and the original sources.