YOKOGAWA F3CU04-0S, User Manual

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C10-3
IM 34M06H62-02E 2nd Edition : June 2008-00

Troubleshooting Errors at Power Up
The following table lists the errors that may be returned by the self-diagnosis procedure
at power up. Check the relevant registers shown in Table C10.1 for the error status.
Table C10.4 Startup Errors
ERR.STUS
(bit pos.)
LED Indicator
Error Condition
Controller
Operation
Measurement Control Output Troubleshooting Status
RDY ERR
Unknown
Off Off
RAM error
Stops operating. Unreliable ≤ 0% or OFF
Have the module
repaired. Hardware
failure
Unknown ROM error
1
Lit
Lit
System data error
2
Calibration value
error
Initializes calibration
value and resumes
normal operation.
Normal
operation
(accuracy is not
guaranteed)
0% or OFF
3
Flashing
Controller or I/O
parameter value
error
Automatically
initializes controller or
I/O parameter and
resumes normal
operation.
Normal
operation
Normal operation
(accuracy is not
guaranteed)
Parameters have been
initialized. Check and
set the parameters
again, as required.
4
Operation parameter
value error
Automatically
initializes operation
parameter and
resumes normal
operation.
Normal operation

Troubleshooting Operation Errors
The tables below list the errors that may be detected during operation. Check the
relevant registers shown in Table C10.1 for the error status.
Table C10.5 Operation Errors (1/2)
ERR.STUS
(bit pos.)
LED Indicator
Error Condition
Controller
Operation
Measurement Control Output Troubleshooting Status
RDY ERR
5
Lit lit
AD converter error Normal operation 105%
Automatic: Preset
output
Manual: Normal
operation
*1
Input type setting
Incorrect
wiring
Have the module
repaired. Hardware
failure
6 RJC error in loop
Operation continues
with reference junction
compensation
disabled.
Reference
junction is
assumed to be
at 0

C.
Normal operation
7 EEPROM error
Normal operation
continues but
parameter backup to
EEPROM is not done.
Normal
operation
*1 In Cascade Control mode, the control output originates from the secondary loop (even-numbered loop). This error,
however, results in the specified Preset Output. If this error occurs in the primary loop (odd-numbered loop), the
secondary loop is automatically switched to Automatic mode and operation continues.
Table C10.5 Operation Errors (2/2)
ERR.STUS
(bit pos.)
LED Indicator
Error Condition
Controller
Operation
Measurement Control Output Troubleshooting Status
RDY ERR
11
Lit
Flashing PV burnout in loop
Depends on burnout
selection (BSL).
Depends on
BSL burnout
selection.
Automatic: Preset
output
Manual: Normal
operation
*1
Check the sensor and
sensor circuit.
Process
error
12/13 Off PV

OVER in loop
Continues operation
with PV = 105% or
-5% Limit values Normal operation Check the process.
Unknown Unknown Unknown
Out of control (due
to abnormal power
supply or noise)
CPU resets. Unknown ≤ 0% or OFF
If switching off and on
does not restore normal
operation, have the
module repaired.
Hardware
failure
*1 In Cascade Control mode, the control output originates from the secondary loop (even-numbered loop). This error,
however, results in the specified Preset Output. If this error occurs in the primary loop (odd-numbered loop), the
secondary loop is automatically switched to Automatic mode and operation continues.