934
Failure Diagnosis Instructions
Section 3-30
3-30 Failure Diagnosis Instructions
This section describes instructions used to define and handle errors.
3-30-1 FAILURE ALARM: FAL(006)
Purpose
Generates or clears user-defined non-fatal errors. Non-fatal errors do not stop
PLC operation.
With CS1-H, CJ1-H, and CJ1M CPU Units, FAL(006) can also be used to
generate non-fatal system errors.
Ladder Symbol
• Generating or Clearing User-defined Non-fatal Errors
• Generating Non-fatal System Errors (CS1-H, CJ1-H, CJ1M, or CS1D
Only)
Variations
Applicable Program Areas
Operands
The function of the operands when FAL(006) is used to generate/clear user
defined errors is slightly different from the function when FAL(006) is used to
generate system errors (CS1-H, CJ1-H, CJ1M, and CS1D CPU Units only).
Generating or Clearing User-defined Non-fatal Errors
The following table shows the function of the operands.
Instruction
Mnemonic
Function code
Page
FAILURE ALARM
FAL
006
SEVERE FAILURE ALARM
FALS
007
FAILURE POINT DETECTION
FPD
269
FAL(006)
N
S
N: FAL number
S: First message word or
constant (0000 to FFFF)
FAL(006)
N
S
N: FAL number (value in A529)
S: First word containing the
error code and error details
Variations
Executed Each Cycle for ON Condition
FAL(006)
Executed Once for Upward Differentiation
@FAL(006)
Executed Once for Downward Differentiation Not supported.
Immediate Refreshing Specification
Not supported.
Block program areas
Step program areas
Subroutines
Interrupt tasks
OK
OK
OK
OK
Summary of Contents for CJ1G-CPUxx
Page 3: ...iv N o t i c e ...
Page 5: ...vi ...
Page 21: ...xxii Conformance to EC Directives 6 ...
Page 35: ......
Page 1131: ...1110 CJ series Instruction Execution Times and Number of Steps Section 4 2 ...