Appendices
A-150
CJ2 CPU Unit Software User’s Manual
A-3-2 Read/Write Area (Set by User)
Address
Name Function Settings
Status
after
mode
change
Status at
startup
Write timing/
Related flags,
settings
Words Bits
A500 A500.12 IOM Hold
Bit
Turn this bit ON to preserve the status of the I/O Mem-
ory when shifting from PROGRAM to RUN or MONI-
TOR mode or vice versa. (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 inter-
rupted.)
ON: Retained
OFF: Not retained
Retained Cleared
(PLC
Setup can
be set to
retain sta-
tus.)
See Function
column.
PLC Setup
(IOM Hold Bit
Status setting)
A500.13 Forced Sta-
tus Hold Bit
Turn this bit ON to preserve the status of bits that have
been force-set or force-reset when shifting from PRO-
GRAM to MONITOR mode or vice versa, or when turn-
ing ON the power. Be sure to always use this bit
together with the IOM Hold Bit (A500.12). Turn ON the
IOM Hold Bit (A500.12) at the same time as this bit.
Status will also be held with the power supply is inter-
rupted.
To preserve the status of this bit when the PLC is
turned ON, the Forced Status Hold Bit Startup Hold
Setting parameter in the PLC Setup must be turned set.
ON: Retained
OFF: Not retained
Retained Cleared
(PLC
Setup can
be set to
retain sta-
tus.)
See Function
column.
PLC Setup
(Forced Status
Hold Bit Sta-
tus setting)
A500.14 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.
OFF → ON: Clear Retained Cleared A100 to A199,
A300
A500.15 Output OFF
Bit
Turn this bit ON to turn OFF all outputs from Basic I/O
Units, regardless of the status of the output bits in I/O
memory (the same as when a fatal error occurs). The
INH indicator on the front of the CPU Unit will light.
Note: The status of this bit is held when the power
supply is turned OFF.
The status of outputs bits allocated to Special I/O Units
in the CIO Area (e.g., external analog outputs) depends
on the functions of the individual Special I/O Units.
--- Retained Retained ---
A501 A501.00
to
A501.15
CPU Bus
Unit Restart
Bits
Turn these bits ON to restart (initialize) the CPU Bus
Unit with the corresponding 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 Initializing Flag (A302.00 to A302.15) will
be turned ON. Both the restart bit and initializing flag
will be turned OFF automatically when initialization is
completed.
OFF to ON: Restart
ON to OFF: Restart
completed
Turned OFF by the
system when the
Unit has been
restarted.
Retained Cleared A302.00 to
A302.15
A502 to
A507
A502.00
to
A507.15
Special I/O
Unit Restart
Bits
Turn these bits ON to restart (initialize) the Special I/O
Unit with the corresponding unit number. Bits A502.00
to A507.15 correspond to unit numbers 0 to 95.
When a restart bit is turned ON, the corresponding
Special I/O Unit Initializing Flag (A330.00 to A335.15)
will be turned ON. Both the restart bit and initializing
flag will be turned OFF automatically when initialization
is completed.
OFF to ON: Restart
ON to OFF: Restart
completed
Turned OFF by the
system when the
Unit has been
restarted.
Retained Cleared A330.00 to
A335.15
A508 A508.09 Differenti-
ate Monitor
Completed
Flag
ON when the differentiate monitor condition has been
established during execution of differentiation monitor-
ing.
This flag will be cleared to 0 when differentiation moni-
toring starts.
ON: Monitor condi-
tion established
OFF: Not yet estab-
lished
Retained Cleared ---
A508.11 Trace Trig-
ger Monitor
Flag
ON when a trigger condition is established by the Trace
Start Bit (A508.14). OFF when the next Data Trace is
started by the Sampling Start bit (A508.15).
ON: Trigger condi-
tion established
OFF: Not yet estab-
lished or not tracing
Retained Cleared ---
A508.12 Trace Com-
pleted Flag
ON when sampling of a region of trace memory has
been completed during execution of a Trace.
OFF when the next time the Sampling Start Bit
(A508.15) is turned from OFF to ON.
ON: Trace com-
pleted
OFF: Not tracing or
trace in progress
Retained Cleared ---
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