Hardware reference guide

CPU Modules
35013379 02 October 2007 185
Key Switch
Description
The following table shows the key switch information.
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. 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.
This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com