Table 16: Diagnostic Code Cause And Action - ABB 266 MODBUS User Manual

5. Once the recommended action has been taken, access the diagnostics menu again to determine if the alarm has cleared.
If the alarm has not cleared, and multiple actions were recommended, move to the next action and complete it. When the
alarm clears, it is not necessary to continue. If additional alarms are present, repeat steps 4 through 6 for each alarm,
repeating until all alarms are cleared.
Diagnostic code Possible Cause
—
P-dP Sensor Fail
—
Static Pressure Sensor Error in the current circuit for scanning the static
Fail pressure.
Error in the current circuit for scanning the
Sensor Temperature Fail
temperature.
A/D converter error of the temperature sensor.
—
Process Temperature
—
Sensor Fail
—
—
The transmitter's measuring range or model
P-dP Out Of Limits
configuration is not appropriate for this application.
The static pressure of the process exceeds the limits
of the measuring cell.
A wrong transmitter model may have been selected.
Static Pressure Out of
Limits
An overshoot of the static pressure can reduce
accuracy, mechanically damage the membrane, and
make a calibration or replacement necessary.
The temperature of the process environment
influences the pressure transmitter. Excess
Sensor Temperature Out
temperatures can reduce accuracy, impair device
of Limits
components, and make a calibration or replacement
necessary.

Table 16: Diagnostic code cause and action

Mechanical damage on the measuring cell.
Measuring cell loses filling fluid, diaphragm is
torn, sensor damaged.
Incorrect wiring
Wire break
Process conditions exceed critical limit
Process conditions have changed, causing
the device to have operated out of the design
limits
Recommended action
The measuring cell is not field replaceable. Replace the
®
266 MODBUS multivariable transmitter.
The measuring cell is not field replaceable. Replace the
®
266 MODBUS multivariable transmitter.
The measuring cell is not field replaceable. Replace the
®
266 MODBUS multivariable transmitter.
Replace the transmitter's electronics module (go to
section 5.6, Replacing the electronics module).
—
Verify that the RTD is properly wired to the
transmitter (go to section 3.6.4, Transmitter
wiring). Rewire if necessary.
—
Verify that the process temperature has not
reached a critical limit, causing the RTD to fail.
Use the MODBUS
maximum ever measured value and the RTD
minimum ever measured value. If the RTD has
exceeded a critical limit, replace the RTD (go to
section 5.9, Replacing the RTD probe).
Verify that the measuring range was calculated
correctly and that the transmitter is the correct model for
the current application conditions. If incorrect:
—
Replace the transmitter with the correct model
configuration.
—
The incorrect model may still operate correctly,
just not for this application or measurement
range.
Verify that the measuring range was calculated
correctly and that the transmitter is the correct model for
the current application conditions. If incorrect:
—
Replace the transmitter with the correct model
configuration.
The incorrect model may still operate correctly, just not
for this application or measurement range.
®
Use the MODBUS registers to view the SP maximum
ever measured value and the SP minimum ever
measured value. If an overshoot of the SP has
occurred, the unit is damaged. Replace the 266
®
MODBUS multivariable transmitter.
®
The 266 MODBUS multivariable transmitter requires
replacement. Verify that the replacement transmitter is
suitable for the process conditions. A different type of
installation could be necessary, e.g. use of diaphragm
seals.
266 MODBUS® multivariable transmitter User manual 2105216 Rev. AB | 71
6 Troubleshooting
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registers to view the RTD