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CPU Unit Operating Modes Section 10-2
10-2-2 Status and Operations in Each Operating Mode
PROGRAM, RUN, and MONITOR are the three operating modes available in
the CPU Unit. The following lists status and operations for each mode.
Overall Operation
Programming Console Operations
Note The following table shows the relationship of operating modes to tasks.
Mode Program
(See note)
I/O refresh External outputs I/O Memory
Non-holding
areas
Holding areas
PROGRAM Stopped Executed OFF Clear Hold
MONITOR Executed Executed Controlled by pro-
gram
Controlled by program
RUN Executed Executed Controlled by pro-
gram
Controlled by program
Mode Monitor I/O
Memory
Monitor
Program
Transfer Program Check
Program
Create I/O
Table
PLC to
Programming
Device
Programming
Device to PLC
PROGRAM OK OK OK OK OK OK
MONITOR OK OK OK XXX
RUN OK OK OK XXX
Mode PLC Setup Modify
Program
Force- set/
reset
Changing
Timer/Counter
SV
Changing
Timer/Counter
PV
Changing I/O
Memory PV
PROGRAM OK OK OK OK OK OK
MONITOR X OK OK OK OK OK
RUNXXXXXX
Mode Cyclic task status Interrupt task
status
PROGRAM Disabled status (INI) Stopped
MONITOR • Any task that has not yet been executed, will be in disabled status (INI).
• A task will go to READY status if the task is set to go to READY status at star-
tup or the TASK ON (TKON) instruction has been executed for it.
• A task in READY status will be executed (RUN status) when it obtains the
right to execute.
• A status will go to Standby status if a READY task is put into Standby status
by a TASK OFF (TKOF) instruction.
Executed if inter-
rupt condition is
met.
RUN
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