Rockwell-automation 1747-KE,D17476.12 DH-485/RS-232C Interface Module User Manual download pdf (Page 123)

Publication 1747-UM005B-EN-P - March 2006

PLC-5 to SLC 500 Communications B-3

Use the PLC-5 Message

Instruction with Word

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

between 010 (base 8) and 177 (base 8). This range corresponds to

word 16 (base 10) through word 254 (base 10) in the SLC processor.

Only even numbered words (16, 18, 20,... 254) in the SLC processor

can be addressed by the PLC-5 Message instruction. The maximum

value for the PLC-5 Message instruction Size in Elements parameter is

112 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 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, N9:16.

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

processor is created to at least N9:25.

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.

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Rockwell-automation 1747-KE,D17476.12 DH-485/RS-232C Interface Module User Manual Page 123