1025
3. Instructions
CS/CJ/NSJ Series Instructions Reference Manual (W474)
Failure Diagnosis Instructions
3
FALS
FALS
Applicable Program Areas
Operands
z Generating User-defined Fatal Errors
Note The value of operand N must be different from the content of A529 (the system-generated FAL/FALS number).
z Generating Fatal Errors from the System
The following table shows the function of the operands.
Note The value of operand N must be the same as the content of A529 (the system-generated FAL/FALS number).
z Operand Specifications
Flags
Instruction Mnemonic Variations
Function
code
Function
SEVERE FAILURE ALARM FALS --- 007
Generates user-defined fatal errors. Fatal errors
stop PLC operation.
Symbol
FALS
Generating or Clearing User-defined Fatal Errors Generating Fatal Errors from the System
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
N 1 to 511 (These FALS numbers are shared with FALS numbers.)
S
Specifies the first of eight words containing an ASCII message to
be displayed on the Programming Device.
Specify a constant (0000 to FFFF) if a message is not required.
Generates a non-fatal error
N 1 to 511 (These FALS numbers are shared with FAL numbers.)
S Error code that will be generated. (See Description below.)
S+1 Error details code that will be generated. (See Description 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
Name Label Operation
Error Flag ER • ON if N is not within the specified range of 0001 to 01FF (1 to 511 decimal).
• ON if a fatal system error is being generated, but the specified error code or error details code is
incorrect.
• OFF in all other cases.
N: FAL number
S: First message word or
FALS(007)
N
S
constant (0000 to FFFF)
N: FAL number (value in A529)
S: First word containing the
FALS(007)
N
S
error code and error details
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