9. TROUBLESHOOTING
9-2 IMR02C15-E4
9.1 Error Display
This Section describes error display when the measured value (PV) exceeds the display range and the
self-diagnostic error.
Display when input error occurs
The table below shows displays, description, control actions and solutions when the measured value
(PV) exceeds the display range.
Prior to replacing the sensor, always turn the power OFF or change to STOP with
RUN/STOP transfer.
Display
Description Action (Output) Solution
Measured
value (PV)
[Flashing]
Measured value (PV) exceeds
the input range.
Display does not flash
when “Non-flashing display” is set.
Oooo
[Flashing]
Over-scale
Measured value (PV) is above
the display range limit high.
uuuu
[Flashing]
Underscale
Measured value (PV) is below
the display range limit low.
• Control output:
Output depending on
the “Control output
at burnout”
(Refer to P. 8-127.)
• Event output:
Output depending on
the “Event output state
at input burnout”
(Refer to P. 8-115.)
Check Input type, Input
range and connecting
state of sensor.
Confirm that the sensor
or wire is not broken.
Input range
(Input span)
Display range limit
Measured
value (PV)
flashing *
Measured value
(PV) display
Measured
value (PV)
flashing *
Overscale
Underscale
5 % of Input span
Action area at input error
Action area at input error
5 % of Input span
Input scale low
Input scale high
Chooses either
0: Result of control
computation
Event status at input error
Event
1: Low output limiter value
(Output OFF)
Chooses either
Event status at input error
* “PV flashing display at input error (P. 8-94)” of PV can be selected for the PV flashing display at input
error of the Engineering mode (F21).
Result of control computation
• Auto mode
Manipulated output value (MV)
obtained by PID control
• Manual mode
Manipulated output value (MV)
at manual setting
Manipulated output
(MV)
0: Result of control
computation
1: Low output limiter value
(Output OFF)
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