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Lead Contents

Counters: Input Signal

FAQ No. FAQ00887

Primary Contents


Why does the Counter not count when the input signal is input?


1. The input mode and actual input may not match.


If an encoder input is used, check whether the input mode is set to Up/Down (incrementing/decrementing) C mode.

2. If the maximum counter speed is set to low speed, the pulse may be shorter than the minimum input width, preventing the Counter from counting the input. Match the maximum counting speed to the actual input width.

3. A no-voltage signal may be input to a voltage-input model.
Replace the input device with a voltage output model, or connect an external resistor if using input from an open collector.

The following diagram shows an example using the H7AN.

*Please set the input signals to "H (High)" levels, for the open-collector in the sensor to be turned off.