Rockwell Automation 1775-KA PLC-3 Communication Adapter Module User Manual - Manual (Page 36)

Installation
Chapter 2
2Ć24
keyswitch is on. At initial power–up, the module enables the ACCEPT
WRITES option by default.
Backup Operation
This option determines whether or not a pair of 1775–KA modules will
provide backup for each other. Enable option 5 (BACKUP OPERATION)
for both the primary and backup 1775–KA modules to enable backup
operation as described in section 2.3 (backup configurations). If you
make no selection for option 5, backup operation is disabled by default.
The revision C or earlier version of the module does not have the
BACKUP OPERATION option.
PLC–2 Mask
This option determines whether or not the 1775–KA module will mask
out the upper octal digit of the source address when receiving a PLC–2
type command from another station. If you enable option 6
(PLC–2–MASK) the module mask out the upper digit of the address for
selecting the input file. This causes stations with common second and
third digits of their address to access the same input file. For example,
stations 023, 123, 223, and 323 would all access input file 023.
If you disable option 6, each station accesses a unique input file with the
same number as the station number. For example, station 123 would
access input file 123; station 223 would access input file 223. If you
make no selection for option 6, the PLC–2 MASK option is disabled by
default. The revision D or earlier version of the module does not have the
PLC–2 MASK option.
Data Highway Port
Selecting option 2 DATA HIGHWAY PORT from the above menu
(section titled Programmable Configuration Parameters) causes LIST to
present the following menu:
KA – nn DATA HIGHWAY PORT
1 ENABLE/DISABLE PORT
2 STATION NUMBER
3 BAUD RATE
ENTER NEXT>