Omron CJ1G-CPU series, Programming Manual

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9
Operating Modes Section 1-4
• Registering the I/O table.
• Changing PLC Setup and other settings.
• Transferring and checking programs.
• Force-setting and resetting bits to check wiring and bit allocation.
In this mode, all cyclic and interrupt tasks are non-executing (INI), that is they
stop. See 1-6 Description of Tasks for more details on tasks.
I/O refreshing is performed in PROGRAM mode. Refer to the Operation Man-
ual for information on refreshing I/O.
!WARNING
The CPU Unit refreshes I/O even when the program is stopped (i.e., even in
PROGRAM mode). Confirm safety thoroughly in advance before changing the
status of any part of memory allocated to I/O Units, Special I/O Units, or CPU
Bus Units. Any changes to the data allocated to any Unit may result in unex-
pected operation of the loads connected to the Unit. Any of the following oper-
ation may result in changes to memory status.
• Transferring I/O memory data to the CPU Unit from a Programming
Device.
• Changing present values in memory from a Programming Device.
• Force-setting/-resetting bits from a Programming Device.
• Transferring I/O memory files from a Memory Card or EM file memory to
the CPU Unit.
• Transferring I/O memory from a host computer or from another PLC on a
network.
MONITOR Mode The following operations can be performed through Programming Devices
while the program is executing in MONITOR mode. The RUN indicator will be
lit. This mode is used to make test runs or other adjustments.
• Online Editing.
• Force-setting and force-resetting bits.
• Changing values in I/O memory.
In this mode, the cyclic tasks specified for execution at startup (see note) and
those are made executable by TKON(820) will be executed when program
execution reaches their task number. Interrupt tasks will be executed if their
interrupt conditions occur.
Note The tasks that are executed at startup are specified in the program properties
from the CX-Programmer.
RUN Mode This mode is used for normal program execution. The RUN indicator will be lit.
Some Programming Device operations like online editing, force-set/force-
reset, and changing I/O memory values are disabled in this mode, but other
Programming Device operations like monitoring the status of program execu-
tion (monitoring programs and monitoring I/O memory) are enabled.
Use this mode for normal system operation. Task execution is the same as in
MONITOR mode.
See 10-2 CPU Unit Operating Modes in the Operation Manual for more details
on operations that are available in each operating mode.