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M
ain
Chapter 2 CPU Function
2-9
%FW202 - _ANC_ERR
Information on the
external device’s
failure
Displays the information on the external
device’s failure
%FW203 - _ANC_WAR
Information on the
external device’s minor
failure
Displays the information on the external
device’s minor failure
Notice
• For more details on the whole flags, refer to the Appendix 1 Flag Table of the Outline of this manual.
2.3.4 Function to check the battery voltage
It is the function to detect and inform the fact that the battery voltage is lower than the memory backup voltage. When a
battery low voltage, the ERR LED of the voltage unit is flickering at 1 second interval and F0045 (_BAT_ER)flag is On. In this
case, you need to change the battery referring to 3.4.4 How to change a battery of the Outline of this manual.
2.3.5 Function to check the expansion module
It is the function to check whether I/O modules work normally during startup and operation. It checks the status of every scan
expansion module and the PLC checks whether the following situations occur.
• In case the module that is different from the set parameter is installed at the time of initial operation or failure is suspected
• In case expansion modules are detached or failure is suspected.
If abnormal conditions are detected, the basic unit’s ERR LED will be flickering and the PLCU will be stopped.
2.3.6 Failure Diagnosis Function for the External Device
It is the function to detect the failure of the external device connected to the PLC to realize stoppage of the system and
warning easily. Through this function, you can detect the external device’s failure without complex programming and can
monitor the failure position without special devices (XG5000, etc.) or programs.
You can use the failure diagnosis function for the external devices as below.
(1)Failure types of external devices
• The failures of external devices are divided into the two types; failure (error) detected by combination of
user programs and special relay (F area) requires stoppage of the PLC operation; minor failure (warning)
that continues the PLC’s operation and displays the detection status only.
(2) Flag to detect failures of external devices
The following flag types are used to diagnose failures of external devices.
Word Bit Flag Name Function Description
%FW202 - _ANC_ERR
Information on the external
device’s failures Input the error code of user-defined
serious failure of external device.
%FW203 - _ANC_WAR
Information on the external
device’s MINOR failures Input the error code of user-defined
minor failure of external device.
- %FX38
_ANNUM_E
R detection of external serious
error It is On when the external device’s
serious failure occurs.
- %FX70
_ANNUM_W
AR detection of external slight
error It is On when the external device’s minor
failure occurs.
- %FX3202
_CHK_ANC_
ERR
Request detection of external
serious error
It is the command flag asking to detect
the external device’s serious failure.
- %FX3203
_CHK_ANC_
WAR Request detection of external
slight error minor failure It is the command flag asking to detect
the external device’s minor failure.