210 SERIES SIGNAL MONITOR
OPERATIONS MANUAL
Eberle Design Inc. Page 4
latching. With latching operation, only a loss of AC Line will restore operation. If the microprocessor
resumes operation the unit will not return to normal operation.
3.6 RESET INPUT DETECTION
A reset command from either the front panel Reset button or External Reset input will cause a one-time
reset command to the monitor. If the reset command is maintained longer than 500 milliseconds, the
monitor will resume monitoring functions and the Reset command will then provide input to the
Diagnostic Display mode (see Section 3.10).
3.7 LED TEST
The monitor will illuminate all front panel indicators for 500 milliseconds when a Reset command is
issued by the front panel Reset button or External Reset Input. This function provides a means to verify
the operation of all front panel indicators.
3.8 MEMORY TEST
The Signal Monitor verifies the proper operation of the memory devices (RAM, EPROM, & EEPROM)
required to operate the monitor. This test is performed when AC Line power is applied, a Reset
Command is issued to the monitor, and periodically during operation. If a memory error is detected, the
Signal Monitor will attempt to update the front panel display and then execute a STOP instruction. This
will cause the Output relay contacts to close and enable the Stop-Time output to the controller. The
DIAGNOSTIC indicator on the front panel will illuminate to indicate a monitor hardware and/or firmware
failure. Due to the nature of these hardware or firmware failures, other fault indicators that may be
concurrently illuminated may not be valid for trouble shooting purposes.
3.9 WATCHDOG MONITORING DISABLED INDICATOR
When the WDT ENABLE switch is in the OFF position to disable Watchdog Monitoring of the cabinet
Controller, or the AC Line voltage is below the Watchdog disable level, the Signal Monitor will flash the
WDT ERROR indicator on the front panel once every 2 seconds. This function informs the service
technician that the cabinet Controller Watchdog monitoring function is disabled.
3.10 DIAGNOSTIC DISPLAY MODE
The Signal Monitor provides two means of displaying the individual Green and Yellow field status. The
No Fault Diagnostic Display mode shows the individual colors while the monitor is not in the fault mode
(intersection operating). The Fault Diagnostic Display mode shows the individual colors that were active
at the time the monitor triggered to the fault mode (intersection in flash). The Fault Diagnostic Display
mode also provides a review of previous fault events.
3.10.1 NO-FAULT DIAGNOSTIC DISPLAY
When the Signal Monitor is not in the fault state, the unit can display the active Green and Yellow field
status individually. To enter this display mode depress and hold the Reset button. Each time the Reset
button is activated and held, the next set of colors will be displayed on the channel status indicators.
The display will continue to show the selected color as long as the Reset button is activated. This mode
only affects the monitor display and normal fault processing will continue to occur. The sequence is as
follows:
Reset Fault Status LEDs Channel Status LEDs
#1 (G) AC POWER LED flashes Green field status 1-16
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