GE Mark VIeS System Manual page 217

Mode Possible Cause
CurrentOutput The commanded output is beyond the range of
the output.
CurrentOutput There is a field wiring problem
CurrentOutput There is an open loop or too much resistance in
the loop.
CurrentOutput The I/O pack has failed.
CurrentOutput The terminal board has failed.
RTD RTD wiring/cabling open or high impedance.
RTD Open on connections to the terminal board.
RTD RTD device failed.
RTD YUAA module internal hardware problem.
RTD Current source on YUAA for RTD faulty or
measurement device failed.
RTD Wrong type of RTD configured or selected by
default.
RTD High-resistance values created by high voltage
and/or low current.
Thermocouple Thermocouple millivolt input exceeds the limits
of the YUAA hardware.
Thermocouple Cold junction input to the analog-to-digital
converter exceeded the limits of the converter. If
a cold junctions fails, the CJ_Backup value is
used.
Thermocouple Thermocouple mV input exceeded range of
linearization (lookup) table for this TC type.
Refer to documentation for specified
thermocouple ranges.
Thermocouple Thermocouple configured as wrong type.
Thermocouple Board detected a thermocouple open
Thermocouple Stray voltage or noise caused the input to
exceed its range.
YUAA Universal I/O Modules
Point Unhealthy Troubleshooting (continued)
Solution
Verify that the commanded output is within the range of the output.
Check the field wiring and device.
Confirm the correct I/O pack 28 V input power. Check the field wiring and
device.
Replace the I/O pack.
Replace the terminal board.
Check the field wiring and connections to indicated RTD input channel.
Check the field wiring and field device.
Replace the RTD device.
Replace the I/O pack.
Replace the I/O pack. Replace the field device.
From the ToolboxST application, modify the YUAA I/O pack to correct the
configuration.
Check the field wiring and field device.
Check field wiring, including shields. Measure incoming mV signal and
verify that it is within the specified thermocouple range. Check installation
of the I/O pack on the terminal board. This problem is usually not an I/O
pack or terminal board failure if other thermocouples are working correctly.
Verify that the installed type of thermocouple device matches the
configuration found in the ToolboxST application. Replace the field device.
Check installation of the I/O pack on the terminal board. If local CJ, replace
the terminal board.
Check field wiring, including shields. Measure incoming mV signal and
verify that it is within the specified thermocouple range. Check installation
of the I/O pack on the terminal board. Note: The problem is usually not an
I/O pack or terminal board failure if other thermocouples are working
correctly. Verify that the installed type of thermocouple device matches the
configuration found in the ToolboxST application. Replace the field device.
Verify that the installed type of thermocouple device matches the
configuration found in the ToolboxST application.
Check field wiring, including shields. Replace the field device.
Check field wiring, including shields. Replace the field device.
Public Information
GEH-6855_Vol_II System Guide 217