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8-1
Alarm Indicators
There are two indicators on the front of the CPU that provide visual indication
of an abnormality in the PC. The error indicator (ERR) indicates fatal errors
(i.e., ones that will stop PC operation); the alarm indicator (ALARM) indicates
nonfatal ones. These indicators are shown in
2-1 Indicators
.
Caution
The PC will turn ON the error indicator (ERR), stop program execution, and turn
OFF all outputs from the PC for most hardware errors, for certain fatal software
errors, or when FALS(07) is executed in the program (see tables on following
pages). PC operation will continue for all other errors. It is the user’s responsibil-
ity to take adequate measures to ensure that a hazardous situation will not result
from automatic system shutdown for fatal errors and to ensure that proper ac-
tions are taken for errors for which the system is not automatically shut down.
System flags and other system and/or user-programmed error indications can
be used to program proper actions.
8-2
Programmed Alarms and Error Messages
FAL(06), FALS(07), and MSG(46) can be used in the program to provide
user-programmed information on error conditions. With these three instruc-
tions, the user can tailor error diagnosis to aid in troubleshooting.
FAL(06) is used with a FAL number other than 00, which is output to the SR
area when FAL(06) is executed. Executing FAL(06) will not stop PC operation
or directly affect any outputs from the PC.
FALS(07) is also used with a FAL number, which is output to the same loca-
tion in the SR area when FALS(07) is executed. Executing FALS(07) will stop
PC operation and will cause all outputs from the PC to be turned OFF.
When FAL(06) is executed with a function number of 00, the current FAL
number contained in the SR area is cleared and replaced by another, if more
have been stored in memory by the system.
When MSG(46) is used, a message containing specified data area words is
displayed onto the Programming Console or another Programming Device.
The use of these instructions is described in detail in
Section 5 Instruction
Set
.
8-3
Reading and Clearing Errors and Messages
System error messages can be displayed onto the Programming Console or
any other Programming Device.
On the Programming Console, press the CLR, FUN, and MONTR keys. If
there are multiple error messages stored by the system, the MONTR key can
be pressed again to access the next message. If the system is in PROGRAM
mode, pressing the MONTR key will clear the error message, so be sure to
write down all message errors as you read them. (It is not possible to clear
an error or a message while in RUN or MONITOR mode; the PC must be in
PROGRAM mode.) When all messages have been cleared, “ERR CHK OK”
will be displayed.
Details on accessing error messages from the Programming Console are
provided in
7-3 Monitoring Operation and Modifying Data
. Procedures for the
GPC, LSS, and FIT are provided in the relevant
Operation Manuals
.
8-4
Error Messages
There are basically three types of errors for which messages are displayed:
initialization errors, non-fatal operating errors, and fatal operating errors.
Error Messages
Section 8-4