Rockwell-automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command Manual do Utilizador descarregar pdf (Página 83)

6–4 Application Layer Message Packets

Publication

17706.5.16 - October 1996

DST and SRC

Form the DST and SRC bytes of a reply message by interchanging

the DST and SRC bytes of the corresponding command message:

DST SRC

SRC DST

Command

Byte Contents Value supplied by Value range

DST

(destination)

receiving message application layer

•0 to 376 (octal) for DF1

•0 to 376 (octal) for DH

SRC

(source)

sending message data link layer

•0

376

(octal)

for

•0 to 77 (octal) for DH+

•0 to 31 (decimal ) for DH485

When sending messages from asynchronous devices, special

consideration must be given to the SRC byte:

When sending a message from an

asynchronous device connected

Set the SRC byte

to the network

➀

= 0 (the module will set the byte to its own

node number)

directly to a 1771KG

 10 (octal)

➀

you connect to channel 0 of a PLC5/1

1, 5/20, 5/30, 5/40, 5/60 or 5/80 processor and you

send a PLC2

unprotected write, protected write, protected bit write,

unprotected bit write,

what

you put into the SRC byte is very important. This determines the compatibility file. This means

that the value of the SRC byte specifies the data table file number that is written to the PLC5

processor

. The source byte will not be overwritten by channel 0. For SLC 500 processors, the

compatibility file is always 9.

1 2 ... 78 79 80 81 82 83 84 85 86 87 88 ... 250 251

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