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A simple 3-wire KYZ output will transition from closing the K&Y (with K&Z open) to closing K&Z (with K&Y open).
The form A digital inputs on the ION7550 and ION7650 inject a current-limited 30V signal to detect when the contact is closed or open. By configuring the ION module to KYZ mode, it will now count each transition (either open or close) as a "pulse".