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Appendices
A-2
Auxiliary Area Allocations by
Address
The following table lists the data provided in the Auxiliary Area in order of the addresses of the data.
A-2-1
Read-only Words
Address
Name
Words
Bits
A0
10-ms Incrementing
Free Running Timer
A1
100-ms Incrementing
Free Running Timer
A99
00
UM Read Protection
Status
A-52
Function
This word contains the system timer
used after the power is turned ON.
A value of 0000 hex is set when the
power is turned ON and this value is
automatically incremented by 1 every
10 ms. The value returns to 0000 hex
after reaching FFFF hex (655,350 ms),
and then continues to be automatically
incremented by 1 every 10 ms.
Note The timer will continue to be
incremented when the operating
mode is switched to RUN mode.
Example: The interval can be counted
between processing A and processing
B without requiring timer instructions.
This is achieved by calculating the dif-
ference between the value in A0 for
processing A and the value in A0 for
processing B. The interval is counted in
10 ms units.
This word contains the system timer
used after the power is turned ON.
A value of 0000 hex is set when the
power is turned ON and this value is
automatically incremented by 1 every
100 ms. The value returns to 0000 hex
after reaching FFFF hex (6,553,500
ms), and then continues to be automat-
ically incremented by 1 every
100 ms.
Note The timer will continue to be
incremented when the operating
mode is switched to RUN mode.
Example: The interval can be counted
between processing A and processing
B without requiring timer instructions.
This is achieved by calculating the dif-
ference between the value in A0 for
processing A and the value in A0 for
processing B. The interval is counted in
100 ms units.
Indicates whether all of the ladder pro-
grams in the PLC are read-protected.
Status
after
Settings
mode
change
Retained
Cleared
Retained
Cleared
OFF: UM not
Retained
Retained
read-protected
ON: UM
read-protected.
CP1E CPU Unit Software User's Manual(W480)
Related
Status at
Write
flags,
startup
timing
settings
Every 10 ms
after power is
turned ON
Every 100 ms
after power is
turned ON
When protec-
tion is set or
cleared
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