Technical data

314 • Application Examples
Visualization and Control Using SCADA Software
WAGO-I/O-SYSTEM 750
BACnet/IP Controller
SCADA Systems functions include: visualization and monitoring, data access,
trend recording, event and alarm processing, process analysis and specific in-
tervention in a process (control).
The WAGO ETHERNET fieldbus nodes provide the requisite process input
and output values for this.
Attention
When selecting appropriate SCADA software, always ensure that a
MODBUS device driver is available and that the MODBUS TC/IP functions
implemented in the controller are supported.
Among the many companies that offer visualization programs with MODBUS
device drivers are Wonderware, National Instruments, Think&Do or KEPware
Inc. Some of these programs are also available free of charge online as demo
versions.
This program requires special use.
The sections below therefore provide a number of essential steps that illustrate
how an application can be developed using a WAGO ETHERNET fieldbus
node and SCADA software.
• The MODBUS driver must first be loaded; then, select MODBUS
ETHERNET.
• The user is then requested to enter the IP address for addressing of the field-
bus node.
Some programs also allow assigning the node an alias for this step; e.g., des-
ignating the node as "Measured data." After this, addressing may only be
conducted using this name.
• A graphic object can then be created, such as a switch (digital), or a potenti-
ometer (analog).
This object is displayed on the user interface and the user must then link it to
the required data point at the node.
• Linking is performed by inputting the node address (IP address or alias) of
the required MODBUS function code (register/bit read/write) and the
MODBUS address for the required channel.
Again, input is made as required by the specific program.
Depending on the application software being used, the MODBUS addresses
for the bus module may be displayed with 3, or as illustrated in the examples
below, with 5 places.