Rockwell Automation 1775-KA PLC-3 Communication Adapter Module User Manual - Manual (Page 35)

Installation
Chapter 2
2Ć23
Send Unprotected
This option determines whether or not the 1775–KA module will be able
to send unprotected command messages to other stations. If you select
option 2 SEND UNPROTECTED, the 1775–KA module will be able to
send both protected and unprotected commands.
You can use an unprotected command to read or write to any area of a PC
data table. You can use a protected command, however, to write only to
those areas of a PC data table specified by the PC that receives the
command. For more information on protected and unprotected
commands, see section titled Access Privileges, chapter 3.
If you do not select (enable) this option, the module will be able to
transmit only protected commands. At initial power–up, the module
enables the SEND UNPROTECTED option by default.
Accept Upload/Download
This option determines whether or not the 1775–KA module will be able
to execute upload and download commands sent to it by a computer. If
option 3 ACCEPT UPLOAD/DOWNLOAD is selected, the module will
be able to execute both upload and download commands. You send a
sequence of upload and download commands when you want to transfer
the memory of the PLC–3 to another station, or to transfer the memory of
another station to a PLC–3.
If this option is not selected (enabled) the module will not be able to
execute either of these two types of commands. For a description of
upload and download commands, refer to Appendix A. At initial
power–up, the module enables the ACCEPT UPLOAD/DOWNLOAD
option by default.
Accept Writes
This option determines whether or not the 1775–KA module will accept
write–type command messages from a remote Data Highway station when
the local PLC–3 processor’s memory protect keyswitch is on. If option 4
ACCEPT WRITES is selected, the module will accept write commands
regardless of the setting of the PLC–3’s memory protect keyswitch. If
this option is not selected (enabled) the module will accept write
commands when the memory protect keyswitch is off but will reject the
write commands and return an error code of 86 if the memory protect