210E / 210ECL / 2010 / 2010ECL / 2018ECL SERIES SIGNAL MONITOR
OPERATIONS MANUAL
Eberle Design Inc. Page 2
1.2.3 CONTROLLER WATCHDOG MONITORING (WDT ERROR)
Sensing of the controller Watchdog output is provided as specified in Section 4.3 of the
Caltrans Traffic Signal Control Equipment Specifications. When a logic transition is not
sensed for the specified period (see Section 8.2) the Signal Monitor will enter the fault
mode causing the Output relay contacts to close and enabling the Stop-Time output to the
controller.
The WDT Latch option (see Section 4.5.1) determines whether this WDT Error fault mode
is latched through an AC Line brownout or not. If the WDT Latch option is not selected, an
AC Line brownout condition will reset the WDT ERROR fault mode when the AC Line is
restored. The WDT Error indicator will remain illuminated until a Reset command is issued
via the front panel RESET button or External Reset input. This indicates to the technician
that a WDT Error occurred but was cleared by an AC Line brownout. If the WDT LATCH
option is selected, the WDT Error fault mode is maintained until a Reset command is
applied.
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