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Device Addressing and Message Routing
31007492
18
2.1 Modbus Plus Message Routing Paths
&! "(& (& !'*"% ! ) (# '" %&& !"
)& *' ) )! (!$( %&& " '*! !
('# !'*"%& ! "! '%"( % (& )& )&
%&& "'% %"&& % (& )& , &#,! %"('!
#'& " ) ,'& *' ,' %#%&!'! ! %&& "! ' !+'
!'*"% & %"('! '" "*& !"& ! "'% !'*"%& '"
%&& (# '" "(% !'*"%& *, %" ' "%!'! !"
%"('! #' & ! ' "(& (& && % & ' &
&!' %" ' "%!'! !"
MESSAGE FRAME
ROUTING
PATH
ROUTING ADDRESS 1
ROUTING ADDRESS 2
ROUTING ADDRESS 3
ROUTING ADDRESS 4
ROUTING ADDRESS 5
MODBUS PLUS
EXAMPLE:
ROUTING ADDRESS 1 = 25
ROUTING ADDRESS 2 = 20
ROUTING ADDRESS 3 = 12
ROUTING ADDRESSES 4, 5 = 0
(NO FURTHER ROUTING)
(NO FURTHER ROUTING)
START
END
Figure 4
Message Frame Routing Path Field
(% & ! + # " && %"('! '" #%"% "!'%"%
'%"( '% !'*"%& '' % "! , % (& !" )&
&& * %&' %"(' '" !"
% (& "! ' "
!'*"% ' !" "%*%& ' && "! '" % (& '
%&& "! ' &"! !'*"% &"! % (& "%*%& '
&& '" '& ! &'!'"! !" %&& "! ' '% !'*"%
-%" "!'!'& " ,'& !
&#, !" (%'% && %"('!
2.1.1
Routing to Programmable Controllers
"% #%"% "!'%"%& ' &' !"!-%" ,' ! ' &&
%"('! &#& ' !'*"% !" %&& " ' "!'%"% '"