Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Instrukcja Użytkownika Pobierz pdf (Strona 59)

Addressing Rules and Examples

Chapter 4

43

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

1 2 ... 54 55 56 57 58 59 60 61 62 63 64 ... 238 239

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Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Instrukcja Użytkownika Strona 59