Services Support - FAQ - For Delta’s Controller with Human Machine Interface HMC Series, why can’t I hear the “tok” sound when the remote I/O module outputs the signal?

For Delta’s Controller with Human Machine Interface HMC Series, why can’t I hear the “tok” sound when the remote I/O module outputs the signal?

In the past the remote I/O Module of the HMC Series provided transistor output so there was no “tok” sound such as for relay signal output. Delta now provides a remote I/O module with both transistor and relay output, which has the “tok” sound when the module operates.

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