Rockwell Automation 1771-KA2 Communication Adapter Module User Manual
Page 30
Module Installation
Chapter 3
3-6
In this binary–coded octal numbering arrangement, each switch has an
associated binary value: 1, 2, or 4 if set ON, 0 if set OFF. The value of
each individual digit of the station number is the sum of the binary values
in its corresponding switch assembly. Table 3.A gives an example for the
settings of this switch group.
Table 3.A
Switch Setting Example: Station No. 037
STATION
NO. DIGITS
0
3
7
SWITCH NO.
1
2
1
2
3
1
2
3
SWITCH
SETTING
OFF
OFF
OFF
ON
ON
ON
ON
ON
Note that the switches allow a range of station numbers from 000
8
to 377
8
(256 possible numbers). However, there are practical reasons for using
the the range 010
8
–077
8
and 110
8
–376
8
. These station numbers are
addressable from any station using an industrial terminal. PLC–2 family
programmable controllers cannot address 000
8
to 007
8
or 100
8
to 107
8
.
Also, station 377
8
is an illegal address on the Data Highway. To optimize
response times, use consecutive station numbers beginning with 010
8
.
Data Highway Baud Rate Switch Assembly
The switch assembly labeled SW5 on the module circuit board is the data
highway baud rate switch assembly. (Refer to Figure 3.4). The switches
in this assembly must be set for the baud rate being used on the Data
Highway communication link.
Figure 3.4
Data Highway Baud Rate Switch Assembly
O
O 1
2
N
F
F
Both switches ON for
57.6K Baud Rate