259
2-8 Troubleshooting
Error Control output Remedy
Watchdog timer error “EEEE” set in input
word.
OFF for all outputs. Turn the power supply OFF and then back
ON. If the error persists, replace the Unit.
RAM read/write error “E100” set in input
word.
EEPROM error “E120” set in input
word.
Parameter change
during autotuning
“EE00” set in input
word.
Normal operation will
continue.
Set parameter after autotuning has been
completed.
Setting range error “EE01” set in input
word.
Reset the setting to within the proper
range.
Sensor error “E400” set in input
word when process
value is monitored for a
loop.
Auto Mode: OFF for
control loop with error.
Manual Mode:
Operation will continue
with manual output
level.
Check the connections to the input sensor
and cold junction compensator.
Check the sensor for broken or shorted
wiring.
Check the sensor connections to be sure
they have not been reversed.
Be sure the correct sensor and
compensating lead are connected.
Be sure the input temperature range has
not been exceeded.
Check the cold junction compensator to be
sure it is connected properly.
Be sure the sensor and input type settings
agree.
Be sure the input type DIP switch and the
function DIP switch settings are correct.
CT input error “E500” set in input
word when heater
current is monitored for
a loop.
The heater burnout
alarm output will
maintain the same
status as before the CT
input error.
The current is 55 A or higher. Reduce the
heater current to below 55 A.
Timeout error (for
IOTC(––) instruction)
“E900” is output to the
destination word (D) for
the IOTC(––)
instruction.
Normal operation will
continue.
The set value for the I/O allocation
command will not have been written.
Repeat the setting.
Error Priority
The error code with the highest priority will be set then more than one error oc-
curs at the same time. The errors are given in order of priority in the above table.
Troubleshooting
Section 2-8
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