Hardware reference guide

CPU Modules
188
35013379 11/2011
The CPU53414A has 1435KByte of Flash EPROM memory, which can be used to
save the program and the initial values of variables. On power up, if you have a
program in flash memory, you can choose the desired operating mode using the
PLC MEM switch on the processor front panel. The 140CPU53414A has a key
switch with Run, Mem Prt, and Stop positions.
Key Switch Description
The following table provides a description of the key switch information.
Stop position The application in Flash is not transferred to internal RAM: warm restart
of the application.
Mem Prt position The application in Flash is not transferred to internal RAM: warm restart
of the application.
Start position The application in Flash is automatically transferred to internal RAM
when the PLC processor is powered up: cold restart of the application.
Key Switch Description
Key
Switch
Position
Controller Status Memory Protected
From Programmer
Changes
Will Accept
Programmer
Stop or Start
Key Switch
Transition
Stop Controller is stopped
and disables
Programmer changes.
Y N From Start or
Memory Protect:
Stops controller,
if running, and
disables
Programmer
changes
Mem Prt Controller may be
either stopped or
running and
Programmer changes
are disabled. The user
cannot write to
unlocated variables.
Y N From Stop or
Start: Prevents
Programmer
changes,
controller run
status is not
changed
Start Controller may be
either stopped or
running. Programmer
may make changes
and start/stop the
controller
N Y From Stop:
Enables
Programmer
changes, starts
controller.
From Memory
Protect: Enables
programmer
changes, starts
controller if
stopped.