210E / 210ECL / 2010 / 2010ECL / 2018ECL SERIES SIGNAL MONITOR
OPERATIONS MANUAL
Eberle Design Inc. Page 7
2.11 CONFIGURATION CHANGE MONITORING
The Signal Monitor maintains an internally calculated CRC value of the current
configuration settings. These settings include the permissive diode matrix, SSM switches,
Yellow Disable switches, Option switches, SEL1 through SEL16 jumpers, and the
Watchdog Enable switch. On power-up, reset, and periodically during operation, the unit
will compare the current configuration settings with the previously stored value. If the
settings have changed, the Signal Monitor will automatically log the new setting.
When the Configuration Change Fault select option is enabled (see Section 4.5.3), any
change in the configuration parameters will cause the Signal Monitor to enter the fault
mode causing the Output relay contacts to close and enabling the Stop-Time output to the
controller. To indicate this fault mode the PCA indicator will flash at a 4 Hz rate.
Depressing the Reset button for three full seconds will clear this fault and log the new
configuration parameters.
If the Configuration Change Fault select jumper is not installed, the unit will not set the fault
mode but will still log the configuration change.
2.12 INTERNAL MPU WATCHDOG
The Signal Monitor generates an internal watchdog pulse from its microprocessor. This
occurs at least once per line cycle. If the internal hardware does not detect a watchdog
pulse within approximately 325 milliseconds, 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 DIAGNOSTIC indicator on the front panel will illuminate to indicate a monitor
hardware and/or firmware failure.
This type of failure is configured as 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. If non-latching operation is desired, jumper E5 (Latching MPU Fault) may
be removed.
2.13 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 2.18).
2.14 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.
2.15 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.
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