Page 68 INSTALLATION & USER'S MANUAL SL2
Category 4: Settings
In this chapter all of Category 4 menu items will be explained.
(4.1) OP WDT
Ethernet communications guard OP WDT (Operator Panel Watchdog Timer)
If a hardware failure occurs that breaks the Ethernet communication between the box and
operator panel, a safety function will step in and automatically turn off the light within 3 seconds,
the OP WDT will also interrupt an ongoing sweep or surveillance activity.
If an OP WDT event has occurred an error message will be displayed in the electrical box and
the alarm relay will trigger. When communication returns the message will disappear and the
alarm will be reset.
For multiple panel systems: OP WDT will step in only when communication is lost to all panels.
Possible reasons why OP WDT turn off the lights:
• The power supply to the operator panel is broken.
• The power supply to the Ethernet switch (if any) is broken.
• Broken Ethernet cable between electrical box/ Ethernet switch (if any) and operator
panel.
OP WDT is disabled by default, to enable press “OK” button in menu “4.1 OP WDT” screen and
press the “Down” or “Right” button to toggle the function on/off.
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