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PROGRAM mode is used when making basic changes to the PC program or set-
tings, such as transferring, writing, changing, or checking the program, generat-
ing or changing the I/O table, or changing the PC Setup. The program cannot be
executed in PROGRAM mode. Output points at Output Units will remain OFF,
even when the corresponding output bit is ON.
WARNING
The CPU Unit will continue refreshing I/O even though PC operation is stopped
in PROGRAM mode. If one of the following methods has been used to change
the status of output bits allocated to Output Units or bits allocated to Special I/O
Units or CPU Bus Units, be sure that it is safe to operate the PC before switching
to MONITOR mode or RUN mode. Loads connected to the Output Unit, Special
I/O Unit, or CPU Bus Unit may operate unexpectedly if the status of the
corresponding output bit has been changed.
•
Transferring I/O memory to the CPU Unit from a Programming Device (SSS)
•
Changing PVs from a Programming Device
•
Force-setting or force-resetting bits from a Programming Device
•
Transferring I/O memory from another PC or host computer in the network
DEBUG mode cannot be used in CVM1D mode.
DEBUG mode is used to check program execution and I/O operation after syn-
tax errors in the program have been corrected. With SFC programs, step execu-
tion or section operation can be used to check for errors from a Programming
Device using the DEBUG operation.
MONITOR mode is used when monitoring program execution, such as making a
trial run of a program. The program is executed just as it is in RUN mode, but bit
status, timer and counter SV/PV, and the data content of most words can be
changed online. PC operation in MONITOR mode is significantly slower than it is
in RUN mode. Output points at Output Units will be turned ON when the corre-
sponding output bit is ON.
RUN mode is used when operating the PC in normal control conditions. Bit sta-
tus cannot be Force Set or Reset, and SVs, PVs, and the data cannot be
changed online. Output points at Output Units will be turned ON when the corre-
sponding output bit is ON.
1-6-2 RUN Output
The following table shows the status of the RUN output on the CPU Rack’s Pow-
er Supply Unit for the four operating modes.
Operating mode
Run output status
Start input status
(Waiting)
OFF
OFF
PROGRAM
OFF
ON
DEBUG
OFF
MONITOR
ON
RUN
ON
The RUN output will be turned OFF when a fatal operating error occurs.
PROGRAM Mode
DEBUG Mode
MONITOR Mode
RUN Mode
PC Operating Modes
Section 1-6
Summary of Contents for CVM1D
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