4
Creating Project Files—PLC to Devices
16
Siemens Energy & Automation, Inc.
Saving Port 2 Configuration Information
Once you have entered all the configuration information,
select
Save
to save the configuration to the project file.
Then select
Ok
or press the
Esc
key to close the configura-
tion screen.
If you have changed the configuration and have not saved it
to the project file, you will be prompted to either save or dis-
card the changes.
Select
Revert
to return to the last previously saved configu-
ration without saving any changes.
4.5
Passthrough Setup—Port 3
Port 3 is for passthrough communications. It allows direct
communication with either the PLC on port 1 or the Sie-
mens SEAbus devices on port 2. (Passthrough communica-
tions to port 2 are not available for VDEW devices.)
In passthrough mode, any messages received on port 3 of
the DTU are simply “passed through” to the PLC (port 1) or
devices (port 2). For example, passthrough communications
enables a PC running WinPM, or other supervisory software
connected to port 3 of the DTU3005, to communicate
directly with the SEAbus devices connected to port 2.
You must have a PLC to Devices project file open to config-
ure port 3 using the instructions in this section.
Select
Port 3 (Passthrough)
from the
Edit
menu, and the
Port 3 configuration screen appears.
The first option on the configuration screen allows you to
choose passthrough to port 1 or port 2. Select the appropri-
ate port with the mouse, or use the
Up
or
Down Arrow
keys to highlight the selection and press
Enter
.
The remaining configuration selections except for Intermes-
sage Time-out are the same as those for port 1. Refer to
Section 4.3
for instructions on these fields.
Intermessage Time-Out
The DTU3005 uses the intermessage time-out to determine
when a complete message has been received on the
passthrough port. Once the first character of a message has
been received, if the amount of time specified by the inter-
message time-out passes with no additional characters
being received, the DTU3005 will consider the message to
be complete and process it.
To change the intermessage time-out, select
Intermes-
sage Time-Out
and type in the value in milliseconds, then
press
Enter
.
Saving Port 3 Configuration Information
Once you have entered all the configuration information,
select
Save
to save the configuration to the project file.
Then select
Ok
or press the
Esc
key to close the configura-
tion screen.
If you have changed the configuration and have not saved it
to the project file, you will be prompted to either save or dis-
card the changes. Select
Revert
to return to the last previ-
ously saved configuration without saving any changes.
