Emerson Rosemount CX1100, Reference Manual, Page: 41 / 48

System Alarms
(continued)
Table 7-3:
Alarm label Help messages and recommended actions
SB Mismatch The sensor type does not match, indicating wrong sensor
board is connected.
SB Version The sensor board software version does not match the ex-
pected version, indicating the sensor board software needs
to be upgraded. Place the jumper on J1 of the sensor board
and cycle the power to start the sensor board software up-
grade.
SB Bootload Mode The Bootload Mode jumper at J1 of the sensor board is on
at power up. This mode should only be used to upgrade
the sensor board software. Remove the jumper from J1 of
the sensor board and cycle the power to clear the alarm.
Probe Alarms Table 7-4:
Alarm label Help messages and recommended actions
O
2
T/C Reversed The sensor heater thermocouple voltage is reading a nega-
tive voltage, indicating the thermocouple wire connec-
tions may be reversed. Check wiring.
NV Memory Fail Checksum error was detected in the nonvolatile memory
configuration data when the unit was turned on. Default
values have been loaded. Check to see that your configura-
tions have not been changed. Cycle the power to clear
alarm.
Board Temp High The electronics board tempreature reading is above the
threshold. The board may not function correctly.
Factory Mode The Factory Mode switch is set to On at power up. This
mode should only be uses for factory setup. Turn off the
Factory Mode switch and cycle the power to clear alarm.
Program Integrity Software checksum error detected when the unit was
turned on. Please replace sensor board.
O
2
T/C Shorted This diagnostic is only intended to detect a copper short of
the thermocouple connections at the electronics connec-
tor. The cell heater T/C voltage is reading close to zero, in-
dicating the thermocouple wires may be shorted.
O
2
Sensor Open The cell impedance voltage is reading out of normal range,
indicating the sensor wires may be disconnected or the
sensor junction may be open. Check wiring.
O
2
T/C Open The sensor heater thermocouple voltage is out of range,
indicating the T/C wires may be disconnected, or the T/C
junction may be open. Check wiring.
O
2
Temp Low The sensor heater temperature is below the low tempera-
ture threshold.
Parameters
Reference Manual 35