Rockwell-automation 1747-KE,D17476.12 DH-485/RS-232C Interface Module User Manual download pdf (Page 124)

Publication 1747-UM005B-EN-P - March 2006

B-4 PLC-5 to SLC 500 Communications

Use the PLC-5 Message

Instruction with Byte

The PLC-5 Message instruction’s octal Destination Address must be

between 010 (base 8) and 377 (base 8). This range corresponds to

byte 16 (base 10) through byte 510 (base 10). This allows odd and

even words in the SLC processor to be addressed by the PLC-5

Message instruction.

Destination Address

The maximum value for the PLC-5 Message instruction Size in

Elements parameter is 41 when the destination is an SLC processor

(assuming 1 word elements).

For example, write 10 words from N7 in a PLC-5 to an SLC 5/02 using

the PLC-5’s processor Message instruction. To write 10 words:

1. Set up the source address in the Message instruction as N7:0.

2. Set the Size in Elements to 10.

3. Set up the Command Type as PLC-2 Unprotected Write.

4. Set up the Destination Address as 010 (base 8). This corresponds

to the SLC address, N9:8.

Since 10 words will be written, make sure that the N9 file in the SLC

processor is created to at least N9:17.

It is assumed that the Message instruction will be set up for a remote

destination, since there must be a bridge between the PLC-5 processor

and the SLC 5/02 processor, such as a 1784-KA5 linking a DH+ and

the DH-485 network. The 1747-KE module can be used as a bridge

between the DF1 and DH-485 network.

IMPORTANT

The byte addressing mode is selected in the SLC

processor by setting bit S:2/8 to 1. (The default is

S:2/8 = 0 for word addressing.)This selection bit is

only available in the SLC 5/02 Series B, FRN 3

processor or later.

Byte Word SLC Processor Address

16 8 N9:8

18 9 N9:9

20 10 N9:10

... ... ...

510 255 N9:255

1 2 ... 119 120 121 122 123 124 125 126 127 128 129 ... 138 139

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Rockwell-automation 1747-KE,D17476.12 DH-485/RS-232C Interface Module User Manual Page 124