10
2-1-4 PC Modes
The CQM1 PCs have three operating modes: PROGRAM, MONITOR, and
RUN. The PC mode can be changed from the mode selector on the Program-
ming Console.
RUN
MONITOR
PROGRAM
Mode selector
The key cannot be removed when the
mode selector is set to PROGRAM.
Note Some Programming Devices (e.g., the Programming Console) will clear the cur-
rent display and display the new operating mode when the mode selector is
changed. You can change the mode without changing the display by first press-
ing the SHIFT Key and then changing the setting of the mode selector.
The function of each mode is described briefly below.
PROGRAM Mode PROGRAM mode is used when making basic changes to the PC program or set-
tings, such as transferring, writing, editing, or checking the program, 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.
MONITOR Mode 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. Output points at Output Units will be turned ON when the corre-
sponding output bit is ON.
RUN Mode 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 data cannot be changed
online.
Note When a program section is displayed on the Programming Console and the PC
is in RUN or MONITOR Mode, the ON/OFF status of bits in that program section
will be displayed in the upper-right corner of the display.
Mode Changes The factors that determine the initial operating mode of the PC (the mode when
the PC is turned on) are listed below in order of importance.
1, 2, 3...
1. No Devices mounted:
If no Peripheral Devices are mounted to the PC, the PC will enter RUN mode
when turned ON unless the startup mode setting in the PC Setup (DM 6600)
has been set to MONITOR or PROGRAM Mode.
2. Programming Console mounted:
If the Programming Console is connected to the PC when PC power is
applied, the PC will enter the mode set on the Programming Console’s mode
selector.
3. Other Peripheral Device mounted:
If a Programming Console is not mounted to the PC, but another Peripheral
Device is connected to the PC, the PC will enter PROGRAM mode.
CPU Unit Section 2-1
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