5
Creating Project Files—Modbus Master to Devices
Siemens Energy & Automation, Inc.
37
change the starting register to 10, the last register
will automatically change to 51.
Note: The Modbus Master must read these regis-
ter numbers to be able to access the real-
time data for this device.
6.
Press
Shift+Tab
, or click the left mouse button to
highlight the
File
field and enter the file number.
This parameter is used only with Allen-Bradley
PLCs to specify the file number in the PLC that
contains the register values that are transferred to
or from the device.
7.
The device command registers are displayed
below the real-time data registers. They are con-
figured from the
Device Command Registers
menu selection on the
Edit
menu. See
Section 5.11
for information on setting these reg-
isters and programming the PLC to perform com-
mands. Be sure that the register numbers are not
also used by the device. This can cause unex-
pected operation of the device.
8.
If you want to use a customized subset of the
available data registers, see
Section 5.7.2
for
instructions on creating a default set of custom
registers for all devices of the same type. Type an
“X” in the
Use customized real-time data order-
ing?
field to begin the custom data setup, or press
Tab
to go to the next field.
9.
Enter the
Real-Time Data Delay Time
in its field.
This is the delay from the time that the DTU3005
receives data from the device to the time the
DTU3005 transfers the data to the PLCs registers.
10. Select
Save
to save the device information to the
project file, and then select
Ok
or press
Esc
to exit
the device list configuration screen. If at any time
you want to return to the last saved version of the
device list, select
Revert
without saving any
changes.
Removing a Device
To remove a device from the device list, highlight the
device on the left side of the screen and press
Tab
or
Enter
. Then change the device type to
Not In Use
.
Additional Options for Data Registers
The Device List screen has three additional options for
working with a device’s data registers:
•
Select
Set Reg
to place the data registers into
contiguous register numbers and minimize the
size to the data register block. This option also
sets the initial register number to 1.
•
The
Set All
command performs the same function
but allows you to set the initial register number.
See
Appendix A
for information on acceptable
register number ranges for each PLC model.
•
Select
Pack
to minimize the size of the command
register block, removing registers for deleted
devices.
Saving the Device List Configuration
Once you have entered the device information for all
the devices attached to port 2, select
Save
to save the
device information to the project file. Then select
Ok
or press
Esc
to close the device list configuration
screen.
If you have changed the device information and have
not saved it to the project file, you will be prompted to
either save or discard the changes.
Select
Revert
to return to the last previously saved
configuration without saving any changes.
5.7
Configuring Custom Device
Registers
You can configure which data items from the SEAbus
or VDEW devices are transferred from the DTU3005
device to the PLC or Modbus master. In this way, the
DTU3005 acts as a data concentrator, in addition to
converting the SEAbus and VDEW protocol data. You
can configure the custom data items so that every
device of the same type sends the same data items
(see
Section 5.7.2
), or have each device send particu-
lar data items of interest (see
Section 5.7.1
). SEAbus
devices can be configured to send 16 words of device
data. VDEW devices can be configured to send from 1
to 64 words.
5.7.1
Configuring Custom Registers for a
Single Device
To configure custom registers for a single device:
1.
Select
Device List
from the
Edit
menu.
2.
Highlight the device that you wish to configure
and press
Enter
.
3.
Highlight the
Use customized real-time data
ordering?
check box. Press the
spacebar
to place
an “X” in the check box. Then select
Custom Data
to display the Customized Real-Time Data dialog
box.
