6 Troubleshooting
72 | 266 MODBUS® multivariable transmitter User manual 2105216 Rev. AB
Process Temperature Out
of Limits
— Incorrect RTD wiring
— Wire break
— Deviating process conditions
— Verify that the RTD is properly wired to the
transmitter (go to section 3.6.4, Transmitter
wiring). Rewire if necessary.
— Use the procedure in section 5.10, RTD wiring
verification, to determine if the RTD to
transmitter cable is damaged or requires
replacement.
— Use the MODBUS
®
registers to view the
customer set maximum and minimum values
(5549 through 5556) are set inside of the
normal process operational boundaries. It may
be necessary to replace the RTD or change the
operational limits.
The measuring cell signal is not updated correctly
due to an electronics error, a measuring cell error or
a poorly connected measuring cell cable.
Verify the measurement assembly ribbon cable is
correctly connected to the back of the electronics
module.
The turn-stop has been disengaged, allowing the
housing to be rotated more than one revolution. This
can dislodge the ribbon cable inside of the housing.
Disengaging the turn-stop voids the warranty. Replace
the 266 MODBUS
®
multivariable transmitter.
The model or version of the measuring cell is no
longer compatible with the connected version of the
electronics.
The measuring cell is not field replaceable. Replace the
266 MODBUS
®
multivariable transmitter.
Measuring cell memory damaged
The measuring cell is not field replaceable. Replace the
266 MODBUS
®
multivariable transmitter.
NV Sensor Memory Burn
Error
Writing to non-volatile memory of the measuring cell
was not successful.
The measuring cell is not field replaceable. Replace the
266 MODBUS
®
multivariable transmitter.
Electronic Interface Error
Data exchange between measuring cell and
electronics is faulty.
Remove power from transmitter, then restore. If the
error persists, replace the transmitter's electronics
module (go to section 5.6, Replacing the electronics
module)
Electronic Memory
Failure
Electronic memory is damaged
Replace the transmitter's electronics module (go to
section 5.6, Replacing the electronics module).
NV Electronic Memory
Burn Error
Writing to non-volatile memory was not successful.
Replace the transmitter's electronics module (go to
section 5.6, Replacing the electronics module).
Max Working Pressure
Exceeded
The static pressure of the process exceeds the
maximum permissible working pressure (operating
pressure, not burst pressure) for the transmitter.
Use the MODBUS
®
registers to view the SP maximum
ever measured value and the SP minimum ever
measured value. Determine whether the pressure
transmitter is suitable for the process conditions. It is
possible that a different transmitter type is required.
If necessary, replace the 266 MODBUS
®
multivariable
transmitter.
This effect may have been induced by other devices
in the process (valves, etc.).
A pressure range overshoot, on either the DP or SP
side, can result in reduced accuracy or mechanical
damage of the diaphragm material and can make
calibration or replacement necessary.
Use the MODBUS
®
registers to view the SP maximum
ever measured value, the SP minimum ever measured
value, DP maximum ever measured value, and the DP
minimum ever measured value Determine whether the
pressure transmitter is suitable for the process
conditions. It is possible that a different transmitter type
is required.
If necessary, replace the 266 MODBUS
®
multivariable
transmitter.
Electronic Temperature
Out of Limits
The measurement cell's circuit board has had a
catastrophic failure on the micro-controller.
The measuring cell circuit board is not field replaceable.
Replace the 266 MODBUS
®
multivariable transmitter.
It is likely that additional error codes may also be
present along with this code.
The electronics module has been replaced, but
replacement mode has not been executed.
Complete the remaining instructions in section 5.6,
Replacing the electronics module, beginning with step
8, Uploading the device configuration. This will upload
the configuration files into the new electronics module.
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