TG - H7CC Series - The H7CC-AD is not counting. What is the cause and how can I fix it?

Purpose

This guide explains the cause and solution when the H7CC-AD digital counter does not count despite a voltage input being applied. It is especially relevant when replacing earlier H7CX models with the H7CC series.

Supported Devices

This guidance applies to the following Omron models:

• Example: Replacing an H7CX-A4D with an H7CC-AD.

  (Other models affected: H7CX-AD, H7CX-ASD, H7CX-A4SD, H7CX-AD-N, H7CX-A4D-N, H7CX-ASD-N, H7CX-A4SD-N)

Requirements

Before proceeding, ensure the following:

• The device is wired according to the specified (24 VAC / 12-48 VDC).
• You have access to the unit's wiring terminals and can identify the correct PINs.
• You can safely power cycle the device after making wiring changes. 
• You can locate and adjust the NPN/PNP input mode.
• Use the specified wires for wiring.

  Applicable Wires: AWG 18 to AWG 22, solid or twisted, copper (Wire material: Copper).

Cause

In previous H7CX and H7CX-□-N models (with 12–48 VDC power supply), pins 1 and 6 were internally short-circuited, allowing voltage input detection with only pins 2 and 9 connected.

However, in the H7CC series, pins 1 and 6 are not internally connected, so external shorting is necessary for proper operation with a voltage input.

Procedure

To resolve the issue where the H7CC-AD is not counting:

1. Short-circuit pins 1 and 6 externally.

This replicates the internal connection that existed in earlier H7CX models.

2. Check and set the input mode parameter (IMOD) Input mode:

For voltage input, ensure the IMOD is set to PNP mode.

Note: The factory default setting is NPN.

Refer to the datasheet for the steps to locate the IMOD parameter.

3. Verify connections to the count signal input terminals (pins 2 and 9).

These are typically used for signal input in voltage mode.

Apply changes and test the counting operation.

Date/Revision History

First review 9/15/2025 V1.0

Author: 

Aimee Rivera, Technical Support Engineer

References

H7CC - Datasheet