Emerson Rosemount OCX 8800, Instruction Manual

Page: 124 / 306

Section 7: Foundation
Fieldbus
April 2017
Instruction Manual
IM-106-880C, OI
98
Mapping of
PWA
NV Memory
Failure
NV Writes
Deferred
High
Electronics
Temp-
erature
Transducer
Block:
EEPROM
Corrupt
Resource
Block:
1)
Manufacturing
2)
Block
Integrity Error
3)
NV Integrity
Error
4)
ROM
Integrity Error
Resource
Block:
1)
NV Writes
Deferred
Transducer
Block:
High Electronic
Temperature
FF/
Device
Alerts
FF/
Device
Alerts
Device
Alerts
The non-
volatile
parameter
storage on the
CPU board has
become
unreliable.
This alert
indicates that
the electronics
temperature
has exceeded
80°C. The
device will
cease to
operatereliably
beyond 85°C.
At startup, wait 2
minutes with
power applied and
then cycle power
again or reset
device.
Evaluate
mounting
location and
environment.
This alarm will generally occur during a
startup condition. Rarely, the device could be
powered down while a parameter is being
stored to the non-volatile memory. The
parameter will then be tagged as bad on the
next power on and the memory contents will
be written with default parameters.
Calibration data may be lost and the unit
should be recalibrated. If the unit does not
recover automatically, the memory may be
faulty and the electronics stack should be
replaced. Refer to Section 8, Overview page
165 for details.
A high number of writes has been detected
to non-volatile memory. To prevent
premature failure of the memory, the write
operations have been deferred. The data will
be saved on a 6 hour cycle. This condition
usually exists because a program has been
written that writes to Function block
parameters not normally expected to be
written to on a cyclic basis.
The device may require special mounting
considerations if installed in a very hot
location.
ADC Failure Transducer
Block:
1)
ADC
Timeout Error
2)
ADC
Reference Error
Device
Alerts This alert
indicates faulty
operation of
the device
electronics. Cycle power or
replace the
electronics stack. The Analog to Digital Converter (ADC) is
continuously monitored by the device for
correct operation. Refer to Section 8,
Overview page 165 for details.
Alerts Alarms
AMS
Tab
What does
the alert
indicate?
Recommended
Action
Description
Calibration Transducer Calib- This alert Check instrument Oxygen cells will degrade over time due to
Recommended Block: ration indicates that accuracy and/or aging and corrosion. An increasing cell
Alerts the sensor calibrate. resistance is a good indicator of reduced cell
Calibration resistance has performance. As the cell impedance
Recommende changed by a increases, the cell output falls off and
d predetermined response time increases. Calibrating the
amount since instrument will compensate for the increased
the last cell resistance. If using the device with an
calibration. IMPS or SPS calibration sequencer, increased
cell impedance can automatically trigger a
calibration.