3. Instructions
1018
CS/CJ/NSJ Series Instructions Reference Manual (W474)
Failure Diagnosis Instructions
FAL
Applicable Program Areas
Operands
z Generating or Clearing User-defined Non-fatal Errors
Note The value of operand N must be different from the content of A529 (the system-generated FAL/FALS number).
z Generating Non-fatal System Errors
Note The value of operand N must be the same as the content of A529 (the system-generated FAL/FALS number).
z Operand Specifications
Instruction Mnemonic Variations
Function
code
Function
FAILURE ALARM FAL @FAL 006
Generates or clears user-defined non-fatal errors.
Non-fatal errors do not stop PLC operation.
Symbol
FAL
Generating or Clearing User-defined Non-fatal Errors Generating Non-fatal System Errors
Area
Function block
definitions
Block program areas Step program areas Subroutines Interrupt tasks
SFC action or
transition programs
Usage OK OK OK OK OK OK
Operand Description Data type Size
N FAL number Constants only 1
S
First message word or constant / First word containing the error
code and error details
WORD Variable
Generates a non-fatal error Clears all non-fatal errors
N 1 to 511 (These FAL numbers are shared with FALS numbers.) 0
S
Word address:
Generates a non-fatal error with the corresponding FAL number.
The 16-character ASCII message contained in S through S+7 will
be displayed on the Programming Device.
#0000 to #FFFF:
Generates a non-fatal error with the corresponding FAL number (no
message).
#FFFF: Clears all non-fatal errors.
#0001 to #01FF: Clears the non-fatal error with the corresponding
FAL number.
Other: Clears the most serious non-fatal error.
Generates a non-fatal error
N 1 to 511 (These FAL numbers are shared with FALS numbers.)
S Error code that will be generated. (See Function below.)
S+1 Error details code that will be generated. (See Function below.)
Area
Word addresses
Indirect DM/EM
addresses
Con-
stants
Registers Flags
Pulse
bits
TR
bits
CIO WR HR AR T C DM EM
@DM
@EM
*DM
*EM
DR IR
Indirect
using IR
TK CF
N --- --- --- --- --- --- --- --- --- ---
OK --- ---
---
--- --- --- ---
S OKOKOKOKOKOKOKOK OK OK OK
N: FAL number
S: First message word or
FAL(006)
N
S
constant (0000 to FFFF)
N: FAL number (value in A529)
S: First word containing the
FAL(006)
N
S
error code and error details
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