2 Instructions
2-388 CP1E CPU Unit Instructions Reference Manual(W483)
Flags
Related Auxiliary Area Words and Bits

Auxiliary Area Words/Flags for User-defined Errors Only

Auxiliary Area Words/Flags for System Errors Only

Auxiliary Area Words/Flags for both User-defined and System Errors

Clearing Non-fatal Errors without a Programming Device

Clearing User-defined Non-fatal Errors

When FAL(006) is executed with N set to 0, non-fatal errors can be cleared. The value of S will deter-

mine the processing, as shown in the following table.

Clearing Non-fatal System Errors

There are two ways to clear non-fatal system errors generated with FAL(006).

•Turn the PLC OFF and then ON again.

•When keeping the PLC ON, the system error must be cleared as if the specified error had actually

occurred.

Name Label Operation
Error Flag ER •ON if N is not within the specified range of 0 to 511 decimal.
•ON if a non-fatal system error is being generated, but the specified error code or error details code is
incorrect.
•OFF in all other cases.
Name Address Operation
FAL Error Flag A402.15 ON when an error is generated with FAL(006).
Executed FAL Number Flags A360.01 to
A391.15
When an error is generated with FAL(006), the corresponding flag will be turned ON. Flags A360.01 to
A391.15 correspond to FAL numbers1 to 511 decimal.
Name Address Operation
System-generated FAL/FALS
number
A529 A dummy FAL/FALS number is used when a system error is generated with FAL(006). Set the same
dummy FAL/FALS number in this word (0001 to 01FF hex, 1 to 511 decimal).
Name Address Operation
Error Log Area A100 to A199 The Error Log Area contains the error codes and time/date of occurrence for the most recent 20 errors,
including errors generated by FAL(006).
Error code A400 When an error occurs its error code is stored in A400. The error codes for FAL numbers 0001 to 01FF
are 4101 to 42FF, respectively.
If two or more errors occur simultaneously, the error code of the most serious error will be stored in
A400.
SProcess
&1 to &511 (0001 to 01FF hex) The FAL error of the specified number will be cleared.
FFFF hex All non-fatal errors (including system errors) will be cleared.
0200 to FFFE hex or word specification The most serious non-fatal error (even if it is a non-fatal system error) that has occurred. When more
than one FAL error has occurred, the FAL error with the smallest FAL number will be cleared.