621
Auxiliary Area Appendix C
Read/Write Area (Set by User)
Addresses Name Function Settings Status
after
mode
change
Status at
startup
Write timing/
Related Flags,
Settings
Word Bit
A500 A50012 IOM Hold Bit Turn this bit ON to preserve the sta-
tus of the I/O Memory when shifting
from PROGRAM to RUN or MONI-
TOR mode or vice versa. The I/O
Memory includes the CIO Area,
Transition Flags, Timer Flags and
PVs, Index Registers, Data Regis-
ters, and the Current EM Bank Num-
ber.
(If the status of the IOM Hold Bit itself
is preserved in the PLC Setup (IOM
Hold Bit Status), the status of the I/O
Memory Area will be retained when
the PLC is turned ON or power is
interrupted.)
1: Retained
0: Not retained
Retained Cleared
(PLC
Setup
can be
set to
retain
status.)
See Function column.
PLC Setup
(IOM Hold Bit Status
setting)
A50013 Forced Sta-
tus Hold Bit
Turn this bit ON to preserve the sta-
tus of bits that have been force-set or
force-reset when shifting from PRO-
GRAM to MONITOR mode or vice
versa. Bits that have been force-set
or force-reset will always return to
their default status when shifting to
RUN mode.
(If the status of the Forced Status
Hold Bit itself is preserved in the PLC
Setup (Forced Status Hold Bit Sta-
tus), the status of force-set and
force-reset bits will be retained when
the PLC is turned ON or power is
interrupted.)
1: Retained
0: Not retained
Retained Cleared
(PLC
Setup
can be
set to
retain
status.)
See Function column.
PLC Setup
(Forced Status Hold
Bit Status setting)
A50014 Error Log
Reset Bit
Turn this bit ON to reset the Error
Log Pointer (A300) to 00.
The contents of the Error Log Area
itself (A100 to A199) are not cleared.
(This bit is automatically reset to 0
after the Error Log Pointer is reset.)
0
→ 1: Clear Retained Cleared A100 to A199, A300
A50015 Output OFF
Bit
Turn this bit ON to turn OFF all out-
puts from Basic I/O Units and Spe-
cial I/O Units. The INH indicator on
the front of the CPU Unit will light
while this bit is ON.
(The status of the Output OFF Bit is
retained through power interrup-
tions.)
--- Retained Retained ---
A501 A50100
to
A50115
CPU Bus
Unit Restart
Bits
Turn these bits ON to restart (initial-
ize) the CPU Bus Unit with the corre-
sponding unit number. Bits 00 to 15
correspond to unit numbers 0 to F.
When a restart bit is turned ON, the
corresponding CPU Bus Unit Initializ-
ing Flag (A30200 to A30215) will be
turned ON. Both the restart bit and
initializing flag will be turned OFF
automatically when initialization is
completed.
0 to 1: Restart
1 to 0: Restart
completed
Turned OFF by
the system
when the Unit
has been
restarted.
Retained Cleared A30200 to A30215
A502 to
A507
A50200
to
A50715
Special I/O
Unit Restart
Bits
Turn these bits ON to restart (initial-
ize) the Special I/O Unit with the cor-
responding unit number. Bits A50200
to A50715 correspond to unit num-
bers 0 to 95.
When a restart bit is turned ON, the
corresponding Special I/O Unit Ini-
tializing Flag (A33000 to A33515) will
be turned ON. Both the restart bit
and initializing flag will be turned
OFF automatically when initializa-
tion is completed.
0 to 1: Restart
1 to 0: Restart
completed
Turned OFF by
the system
when the Unit
has been
restarted.
Retained Cleared A33000 to A33515
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