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CPU Unit Operating Modes Section 2-5
2-5-3 Operating Mode Changes and I/O Memory
Operating Mode Changes and I/O Memory
Note 1. The following processing is performed if the I/O Memory Hold Bit is ON.
Outputs from Output Units will be turned OFF when operation stops even
if I/O bit status is held in the CPU Unit.
2. The cycle time will increase by approximately 10 ms when the operating
mode is changed from MONITOR to RUN mode. This will not, however,
cause an error for exceeding the maximum cycle time limit.
Note Refer to SECTION 4 I/O Memory Allocation.
2-5-4 Startup Mode Setting
This setting in the PLC Setup determines the operating mode that will be used
by the CPU Unit when the power supply is turned ON.
PLC Setup
Mode Changes Non-holding areas Holding Areas
• I/O bits
• Data Link bits
• CPU Bus Unit bits
• Special I/O Unit bits
• Work bits
• Timer PV/Completion Flags
• Index Registers
• Data Registers
• Task Flags
Auxiliary Area bits/words are holding or
non-holding depending on the address.
• HR Area
•DM Area
• Counter PV and Completion Flags
Auxiliary Area bits/words are holding or
non-holding depending on the address.
RUN or MONITOR to PROGRAM Cleared (See note 1.) Held
PROGRAM to RUN or MONITOR Cleared (See note 1.) Held
RUN to MONITOR or
MONITOR to RUN
Held (See note 2.) Held
I/O Memory
Hold Bit status
(A500.12)
I/O Memory Output bits allocated to Output Units
Mode changed
between
PROGRAM
and RUN/
MONITOR
Operation stopped Mode changed
between
PROGRAM
and RUN/
MONITOR
Operation stopped
Fatal error
other than
FALS
FALS
executed
Fatal error
other than
FALS
FALS
executed
OFF Cleared Cleared Held OFF OFF OFF
ON Held Held Held Held OFF OFF
Power turned ON.
Operating mode
Name Description Settings Default
Startup Mode Specifies the
CPU Unit oper-
ating mode at
startup
• Program
• Monitor
•Run
• Use programming console
Use program-
ming console
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