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Failure Diagnosis Instructions Section 3-28
3-28 Failure Diagnosis Instructions
Instruction
Mnemonic
Code
Symbol/Operand Function Location
Execution
condition
FAILURE ALARM
FAL
@FAL
006
Also generates (simulates) fatal system errors.
Output
Required
SEVERE
FAILURE ALARM
FALS
007
Also generates (simulates) fatal system errors.
Output
Required
FAILURE POINT
DETECTION
FPD
269
Output
Required
N: FAL number
M: 1st message
word or error
code to generate
(#0000 to #FFFF)
Execution of
FAL(006)
generates a
non-fatal er
ror with FAL
number N.
FAL Error Flag ON
Corresponding Executed FAL Number
Flag ON
Error code written to A400
Error code and time written to Error
Log Area
ERR Indicator flashes
Message displayed
on Programming
Console
Generates or clears user-defined non-fatal errors. Non-fatal errors do not stop
PC operation.
N: FALS number
M: 1st message
word or error
code to generate
(#0000 to #FFFF)
Execution of
FALS(007)
generates a
fatal error
with FALS
number N.
FALS Error Flag ON
Error code written to A400
Error code and time/date written
to Error Log Area
ERR Indicator lit
Message displayed
on Programming
Console
Generates user-defined fatal errors. Fatal errors stop PC operation.
C: Control word
T: Monitoring time
R: 1st register
word
FPD(269)
C
T
R
Time monitoring function:
Starts timing when execution condition A goes
ON. Generates a non-fatal error if output B
isn't turned ON within the monitoring time.
Execution
condition A
Error-processing
block (optional)
Next instruction block
Logic diagnosis block*
Logic diagnosis
execution condition C
Diagnostic output B
Logic diagnosis function
Determines which input in C prevents
output B from
oin
ON.
T
R
Diagnoses a failure in an instruction block by monitoring the time between
execution of FPD(269) and execution of a diagnostic output and finding which
input is preventing an output from being turned ON.
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