Appendix 2. Flag Lists
App2-2
2) System error flag lists
Keyword Type Bit No. Name Description
_CNF_ER WORD
Represent--
ative
keyword
System error
(fatal error)
This flag handles the following operation stop error flags in
batch.
_IO _DEER BOOL Bit 2
Module
loading/unload
ing error
This representative flag indicates that module configuration of
each slot has been changed during operation. (Refer to
_IO_DEER_N and _IO_DEER[n])
_IO _RWER BOOL Bit 4
I/O module
read/write
error
This representative flag indicates that a I/O module does
normally executes read/write. (Refer to _IP_RWER_N and
_IP_IFER[n])
_SP _IFER BOOL Bit 5
Special/com-
munications
module
interface error
This representative flag indicates that special or communications
module has failed in initialization or normal interface is
impossible due to module malfunction. (Refer to _IP_IFER_N
and _IP_IFER[n])
_ANNUN_ER BOOL Bit 6
External
device fatal
fault detection
error
This representative flag indicates that an external device has
fatal error. The error code has been written to _ANC_ERR[n].
− −
Bit 7
− −
_WD_ER BOOL Bit 8
Scan watch
dog error
This flag indicates that the scan time of a program has overrun
the scan watchdog time specified by the parameter.
_CODE_ER BOOL Bit 9
Program code
error
This flag indicates that an unreadable instruction has been met
while executing an user program.
_STACK_ER BOOL Bit 10
Stack overflow
error
This flag indicates that the stack is used out of its
capacity(Overflow)
_P_BCK_ER BOOL Bit 11 Program error
This flag indicates that program execution is impossible due to
destroyed memory or program error.
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