Rockwell Automation 1775-KA PLC-3 Communication Adapter Module User Manual - Manual (Page 59)

Addressing Rules and Examples
Chapter 4
4Ć3
Data is referenced by its address in memory. In a message procedure, you
must precede an address with a dollar sign. The dollar sign acts as a
delimiter to tell the 1775–KA module that it has encountered a data
address. Figure 4.2 illustrates this addressing format in a simple
assignment command.
Figure 4.2
Example Assignment Command Showing Addressing Format
$B45:21 = $I12:33
< <
Destination Source
Assignment Command
Address Address
10018-I
For data locations at remote stations, the remote station number must
precede the data address. Figure 4.3 illustrates this addressing format.
For communication on the Data Highway, the characters #H are required
to delimit the remote station number. For RS–232–C communication
through the 1775–KA module’s modem port, the characters #M delimit
the remote station number.
Figure 4.3
Example of Remote Station Addressing in an Assignment Command
$B45:21 = $I12:33
< <
#H024
<
Source Address
Address Delimiter
Assignment Command
Destination Address
Address Delimiter
Remote Station Number (octal)
Data Highway Port Identifier
Remote Station Delimiter
10019-I
Addresses