5
Creating Project Files—Modbus Master to Devices
Siemens Energy & Automation, Inc.
29
5.2
Configuring the Project File
Once you have created or opened the project file,
select
Edit
from the main menu. When the Device Pro-
tocol for port 2 is set to SEAbus (see
Section 5.4
), the
following menu items appear:
•
Port 1 (Modbus Master)
—allows you to select the
protocol (RTU or ASCII) and configure the com-
munications settings for the Modbus Master
device connected to port 1.
•
Port 2 (Devices)
—allows you to configure commu-
nications settings for SEAbus devices or Siemens
Protective relays connected to port 2.
•
Port 3 (Modbus/Passthrough)
—allows you to
select whether port 3 is used as a passthrough to
the devices on port 2, or used for connection to a
second Modbus Master device.
•
Diagnostics
—allows you to indicate if you want
the DTU3005 to write communications diagnostic
information to the Modbus Master.
•
Device Command Registers
—allows you to indi-
cate which PLC registers will be used for device
commands.
•
Device Defaults
—allows you to set the default
data registers for more than one device of a cer-
tain type, e.g., set the defaults for all 4720 power
meters or all S7-I/O units. The data registers can
still be customized for each device, as required.
See
Section 5.7.2
for more information.
•
Device List
—allows you to indicate which SEAbus
devices or Siemens protective relays are con-
nected to port 2 and which PLC registers they are
communicating with.
Note: If the Device Protocol for port 2 is set to
VDEW (see
Section 5.4
), then two addi-
tional menu items are available:
Global
Command Registers
and
Device Text to
Values Table
. See
Section 5.8
and
Section
for instructions on using these menu items.
In addition, the port 3 menu item is
changed to
Port 3 (Modbus Master)
because the passthrough feature is not sup-
ported with VDEW devices. The instructions
in
Section 5.3
are applicable to port 1 and to
port 3 for VDEW devices.
