Fieldbus coupler/controller
• 61
Review
Modular I/O System
L
ON
W
ORKS
®
In the initialization phase the fieldbus controller determines the physical struc-
ture of the node and creates a process image from this with all inputs and out-
puts. This could involve a mixed arrangement of analog (word by word data
exchange) and digital (byte by byte data exchange) modules.
The local process image is subdivided into an input and output data area.
The data of the analog modules are mapped into the PDOs according to the
order of their position downstream of the bus coupler. The bits of the digital
modules are compiled to form bytes and also mapped into PDOs. Should the
number of digital I/Os exceed 8 bits, the coupler automatically starts another
byte.
The programmer has access to all fieldbus and I/O data.
Attention
An application program meeting IEC 61131-3 standards is necessary for the
fieldbus controller to operate. The bus module data must be copyed on the
PFC variables (fieldbus variables) via the IEC 61131-3 application program,
in order to be read.
3.2.2 Software for the controller
PLC applications on the programmable fieldbus controller 750-819 can be a-
chieved with the programming and visualization tool
WAGO-I/O-PRO 32
(I-
tem-No.: 759-332/000-001) meeting IEC 61131-3 standards.
The LNS-based Plug-In
TOPLON
®
PRIO (Item-No.: 759-340/000-002) is
used to connect the LON network with the programmable fieldbus controller
.
TOPLON
®
PRIO
is used to link the programming tool WAGO-I/O-
PRO
32
and to assign the IEC 61131-3 variables to the network variables.
The abbreviation "PRIO" means "
P
rogrammable
R
emote
I
/
O
".
