149
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
Output
Required
SEVERE
FAILURE ALARM
FALS
007
Output
Required
FAILURE POINT
DETECTION
FPD
269
Output
Required
N
S
FAL(006)
N: FAL number
S: 1st message
word or error
code to gener-
ate
Number Flag ON
Log Area
ERR Indicator flashes
Generates or clears user-defined non-fatal errors. Non-fatal errors
do not stop PC operation.
Also generates non-fatal errors with the system.
Message
displayed on
Programming
Console
Error code and time written to Error
Error code written to A400
Corresponding Executed FAL
FAL Error Flag ON
Execution of
FAL(006)
generates a
non-fatal er-
ror with FAL
number N.
N
S
FALS(007)
N: FALS number
S: 1st message
word or error
code to gener-
ate
ERR Indicator lit
Generates user-defined fatal errors. Fatal errors stop PC operation.
Also generates fatal errors with the system.
Execution of
FALS(007)
generates a
fatal error
with FALS
number N.
Error code and time/date
written to Error Log Area
Error code written to A400
FALS Error Flag ON
Message displayed
on Programming
Console
C: Control word
T: Monitoring time
R: 1st register
FPD(269)
C
T
R
Diagnostic output B
T
R
Next instruction block
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.
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.
Error-pro-
cessing
block (op-
tional)
Logic diagnosis block*
Logic diagnosis function
Determines which input in C
prevents output B from going ON.
Logic diagnosis
execution condition C
Execution
condition A
To Next Page
Loading...
