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3. Instructions
CS/CJ/NSJ Series Instructions Reference Manual (W474)
Failure Diagnosis Instructions
3
FALS
z Displaying Messages with Fatal User-defined Errors
• If S is a word address, the ASCII message beginning at S will be displayed at the Programming
Device when FALS(007) is executed. (If a message is not required, set S to a constant.)
• The message beginning at S will be registered when FALS(007) is executed. Once the message is
registered, it will be displayed when a Programming Console is connected.
• An ASCII message up to 16 characters long can be stored in S through S+7. The leftmost (most
significant) byte in each word is displayed first.
• The end code for the message is the null character (00 hexadecimal).
• All 16 characters in words S to S+7 will be displayed if the null character is omitted.
• If the contents of the words containing the message are changed after FALS(007) is executed, the
message will change accordingly.
z Clearing FALS(007) Fatal System Errors
There are two ways to clear fatal system errors generated with FALS(007).
1. Turn the PLC OFF and then ON again.
2. When keeping the PLC ON, the system error must be cleared as if the specified error had actually
occurred.
z Clearing FALS(007) User-defined Fatal Errors
To clear errors generated by FALS(007), first eliminate the cause of the error and then either clear the
error from a Programming Device or turn the PLC OFF and then ON again.
Precaution
Unlike user-defined fatal errors, system errors generated by FALS(007) will clear I/O memory if the IOM
Hold Bit is OFF.
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