392
Auxiliary Area Section 9-11
Functions
The following tables list the functions of Auxiliary Area flags and control bits.
The table is organized according to the functions of the flags and bits. Some
of these functions are not supported by some CPU Unit models and unit ver-
sions. For more details or to look up a bit by its address, refer to
Appendix C
Auxiliary Area
.
Initial Settings
CPU Unit Settings
Basic I/O Unit Settings
Name Address Description Access
I/O Response Times in Basic
I/O Units
A22000 to
A25915
Contains the current I/O response times for CJ-series Basic
I/O Units.
Read-only
IOM Hold Bit A50012 Determines whether the contents of I/O memory are
retained when the PLC’s power is reset or the PLC’s operat-
ing mode is changed (from PROGRAM to RUN/MONITOR
or vice-versa).
Turn ON this bit to maintain I/O memory when changing
between PROGRAM and RUN or MONITOR mode.
Turn OFF this bit to clear I/O memory when changing the
changing between PROGRAM and RUN or MONITOR
mode.
Read/write
Forced Status Hold BIt A50013 Determines whether the status of force-set and force-reset
bits is maintained when the PLC’s power is reset or the
PLC’s operating mode is changed (between PROGRAM and
RUN or MONITOR mode).
Read/write
Power Interruption Disable
Setting (Not supported by
CJ1@-CPU@@ CPU Units.)
A530 Set to A5A5 hex to disable power interrupts (except the
Power OFF Interrupt task) between DI(693) and EI(694)
instructions.
Read/write
Name Address Description Access
Status of DIP Switch Pin 6 A39512 Contains the status set on pin 6 of the CPU Unit’s DIP
switch. (Refreshed every cycle.)
Read-only
Name Address Description Access
Basic I/O Unit Status Area A05000 to
A06915
Indicates alarm status (load short-circuit protection) for
Basic I/O Units. (From slot 0 on Rack 0 + slot 7 on Rack 3)
Read-only
I/O Allocation Status A260 Indicates the current status of I/O allocation, i.e., Automatic
I/O Allocation at Startup or User-set I/O Allocations.
Read-only
Units Detected at Startup
(Racks 0 to 3)
(Not supported by CJ1@-
CPU@@ CPU Units.)
Rack 0:
A33600 to
A33603
Rack 1:
A33604 to
A33607
Rack 2:
A33608 to
A33611
Rack 3:
A33612 to
A33615
The number of Units detected on each Rack is stored in 1-
digit hexadecimal (0 to A hex).
Example: The following would be stored if Rack 0 had 1 Unit,
Rack 1 had 4 Units, Rack 2 had 8 Units and Rack 3 had 10
Units:
A336 = A 8 4 1
Read-only
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