The following table provides key/slider switch information for all three low end CPUs.
CPU Type Switch
Position
Behavior Protected? Accepts
Stop or
Start?
Key Switch Transition
Quantum
140 CPU 311 10
Mem Prt On The application in Flash
memory is not transferred to
internal RAM; a warm restart of
the application is triggered.
Y N From Mem Prt Off:
does not modify last
controller state and
rejects programmer
changes.
Not used Do not use this position,
because it may lead to
undefined operation
Y Nn/a
Mem Prt Off The application in Flash
memory is automatically
transferred to internal RAM
when the PLC is powered up. A
cold restart of the application is
triggered.
N Y From Mem Prt On :
enables programmer
changes and starts
controller if stopped.
Quantum
140 CPU 434 12A
140 CPU 534 14A
Stop The application in Flash
memory is not transferred to
internal RAM; a warm restart of
the application is triggered.
Y N From Start or Mem Prt:
stops controller, if
running, and voids
programmer changes.
Mem Prt The application in Flash
memory is not transferred to
internal RAM. A warm restart of
the application is triggered.
Y N From Stop or Start:
prevents program
changes, controller run
status is unchanged.
Start The application in Flash
memory is automatically
transferred to internal RAM
when the PLC is powered up. A
cold restart of the application is
triggered.
N Y From Stop: enables
programmer changes,
starts controller. From
Mem Prt: accepts
programmer changes,
starts controller if
stopped.
