Rockwell Automation 1771-KA2 Communication Adapter Module - Manual (Page 27)

Module Installation
Chapter 3
3-3
ON – Enables execution of received protected commands.
OFF – Disables received protected commands.
Note that both an ON setting of this switch and a memory access rung are
required to allow execution of received protected commands. (Memory
Access rungs are described in chapter 5.)
This switch does not prevent the module from receiving and executing
unprotected commands from another station. (A separate switch,
described subsequently, enables or disables execution of received
unprotected commands.)
EXECUTE UNPROTECTED WRITE COMMANDS SWITCH
Switch 2 determines whether the module can receive and execute
unprotected write and bit write commands from other stations. Set this
switch as follows:
ON – Enables received unprotected write and bit write commands to
be executed.
OFF – Disables the module from executing received unprotected write
and bit write commands
Note that this switch does not disable unprotected read commands from
being received and executed by the module.
SHUTDOWN/AUTOMATIC RESTART SWITCH
On modules before revision D, switch 3 presents the option, after a hard
error, of restarting the 1771–KA2, or shutting it down.
ON – Shuts down the module
OFF – Automatically restarts itself
When a hard error occurs it normally indicates fairly severe
communication problems that should be corrected before starting. Such
errors usually involve bad cabling or noise.
REVISION D
The third switch in the Write Option Switch assembly on the 1771–KA2
module (formerly the Shutdown/Automatic Restart Switch) will change
function for revision D and become the Execute Download in Run
Program switch.