Operating Modes; Description Of Operating Modes - Omron CJ - PROGRAMMING MANUAL 12-2009 Programming Manual

Operating Modes

1-4

Operating Modes

1-4-1

Description of Operating Modes

PROGRAM Mode
!WARNING
MONITOR Mode
3. Always install the battery provided (CS1W-BAT01) before using a CS1G/
H-CPU@@ or CJ1@-CPU@@ CPU Unit for the first time. After installing the
battery, use a Programming Device to clear the PLC's RAM (parameter ar-
ea, I/O memory area, and user program).
The following operating modes are available in the CPU Unit. These modes
control the entire user program and are common to all tasks.
Program execution stops in PROGRAM mode, and the RUN indicator is not lit.
This mode is used when editing the program or making other preparations
operation, such as the following:
• 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.
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.
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.
Section 1-4
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