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Additional Information
The average cycle time during operation will be displayed in the status bar on the bottom right of
the Ladder Program Window on the CX-Programmer.
I/O Memory
These are the PLC memory areas that are accessed by the ladder programs. SYSMAC PLCs refer to
these areas as the I/O memory. It can be accessed by specifying instruction operands. There are words
in the I/O memory area where data is cleared and words where data is retained when recovering from a
power interruption. There are also words that can be set to be cleared or retained. Refer to Section 5
I/O Memory.
3-1-2
CPU Unit Operating Modes
Overview of Operating Modes
CPU Units have the following three operating modes.
PROGRAM mode:
MONITOR mode:
RUN mode:
Changing the Operating Mode
The operating mode can be changed from the CX-Programmer.
Changing the Startup Mode
The default operating mode when the CPU Unit is turned ON is RUN mode.
To change the startup mode to PROGRAM or MONITOR mode, set the desired mode in Startup
Setting in PLC Setup from the CX-Programmer.
CP1E CPU Unit Software User's Manual(W480)
The programs are not executed in PROGRAM mode.This mode is used for the initial
settings in PLC Setup, transferring ladder programs, checking ladder programs, and
making prepartions for executing ladder programs such as force-setting/resetting bits.
In this mode, it is possible to perform online editing, force-set/reset bits, and change
I/O memory present values while the ladder programs are being executed. Adjust-
ments during trial operation are also made in this mode.
This is the mode in which the ladder program is executed. Some operations are dis-
abled during this mode. It is the startup mode at initial value when the CPU Unit is
turned ON.
3 CPU Unit Operation
3-3
3
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