Figure 12: Power supply terminals6.4.1 WATCHDOGThe Watchdog contacts are also hosted on the power supply board. The Watchdog facility provides two outputrelay contacts, one normally open and one normally closed. These are used to indicate the health of the deviceand are driven by the main processor board, which continually monitors the hardware and software when thedevice is in service.P14x Chapter 3 - Hardware DesignP14xEd1-TM-EN-1 43