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Operating Modes Section 5-2
I/O refreshing is performed in PROGRAM mode.
MONITOR Mode The following operations can be performed while the program is executing in
MONITOR mode. 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.
RUN Mode This mode is used for normal program execution. 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 execution (monitoring programs and
monitoring I/O memory) are enabled. This mode is used for actual operation.
!Caution Confirm that there will be no adverse effects on equipment before changing
the operating mode.
5-2-2 Initialization of I/O Memory
The following table shows which data areas will be cleared when the operat-
ing mode is changed from PROGRAM mode to RUN/MONITOR mode or
vice-versa.
Note 1. Non-held areas: IR area, LR area, Timer PVs, Timer Completion Flags.
(The statuses of some addresses in the AR area and SR area are held and
others are cleared.)
2. Held areas: HR area, DM area, EM area, Counter PVs, and Counter Com-
pletion Flags.
3. The status of Timer PVs and Timer Completion Flags will be held when the
operating mode is changed from RUN mode or MONITOR mode to PRO-
GRAM mode.
4. The status of Timer PVs and Timer Completion Flags will be cleared when
the operating mode is changed from PROGRAM mode to RUN mode or
MONITOR mode.
5. Data in I/O memory will be retained when the I/O Hold Bit (SR 25212) is
ON. When the I/O Hold Bit (SR 25212) is ON and operation is stopped due
to a fatal error (including FALS(07)), the contents of I/O memory will be re-
tained but outputs on Output Units will all be turned OFF. Refer to the
CQM1H Programming Manual for details on I/O memory.
Mode change Non-held Areas
(Note 1)
Held Areas
(Note 2)
RUN/MONITOR → PROGRAM Cleared
(See notes 3 and 5)
Retained
PROGRAM → RUN/MONITOR Cleared
(See notes 4 and 5)
Retained
RUN ↔ MONITOR Retained Retained
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