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operation as well as the procedures that are possible from the Programming
Console.
RUN mode is the mode used for normal program execution. When the switch
is set to RUN and the START input on the CPU Power Supply Unit is ON, the
CPU will begin executing the program according to the program written in its
Program Memory. Although monitoring PC operation from the Programming
Console is possible in RUN mode, no data in any of the memory areas can
be input or changed.
MONITOR mode allows you to visually monitor in-progress program execu-
tion while controlling I/O status, changing PV (present values) or SV (set val-
ues), etc. In MONITOR mode, I/O processing is handled in the same way as
in RUN mode. MONITOR mode is generally used for trial system operation
and final program adjustments.
In PROGRAM mode, the PC does not execute the program. PROGRAM
mode is for creating and changing programs, clearing memory areas, and
registering and changing the I/O table. A special Debug operation is also
available within PROGRAM mode that enables checking a program for cor-
rect execution before trial operation of the system.
DANGER
Do not leave the Programming Console connected to the PC by an extension
cable when in RUN mode. Noise entering via the extension cable can enter the
PC, affecting the program and thus the controlled system.
When the PC is turned on, the mode it will be in is affected by any peripheral
device connected or mounted to the CPU, as follows:
1, 2, 3...
1.
No Peripheral Device Connected
When power is applied to the PC without a Peripheral Device con-
nected, the PC is automatically set to RUN mode. Program execution is
then controlled through the CPU Power Supply Unit’s START terminal.
2.
Programming Console Connected
If the Programming Console is connected to the PC when PC power is
applied, the PC is set to the mode set on the Programming Console’s
mode switch.
3.
Other Peripheral Connected
If a Peripheral Interface Unit, a PROM Writer, a Printer Interface Unit, or
a Floppy Disk Interface Unit is attached to the PC when PC power is
turned on, the PC is automatically set to PROGRAM mode.
If the PC power supply is already turned on when a Peripheral Device is at-
tached to the PC, the PC will stay in the same mode it was in before the pe-
ripheral device was attached. The mode can be changed with the mode
switch on the Programming Console once the password has been entered. If
it is necessary to have the PC in PROGRAM mode, (for the PROM Writer,
Floppy Disk Interface Unit, etc.), be sure to select this mode before connect-
ing the peripheral device; or, alternatively, apply power to the PC after the
peripheral device is connected.
The mode will not change when a peripheral device is removed from the PC
after PC power is turned on.
Mode Changes
The Programming Console
Section 4-4