| 摘要 |
<p>Currents input to and output from a device (14), such as a heater, in a daisy chain connection are measured and compared. Failure of an individual device (14), as well as device location, are indicated if no current is consumed by the device (14). A latch is activated in response to detection of a non-functioning device, sending a signal giving notice and location of the failure. <IMAGE></p> |
