Siemens DTU3005-B manual PLC Protocol, DTU Address, PLC Number, Communications Settings

4 Creating Project Files—PLC to Devices

To select the PLC connected to port 1, highlight PLC Pro- tocol and press Enter. The PLC Protocols selection menu appears:

PLC Protocol	Press the Tab or Right Arrow key to move to the next field
Use the Down Arrow and Up Arrow keys to scroll through	without selecting this checkbox.
the list of available PLC Protocols, since not all choices are	DTU Address
visible at one time. To select a protocol, highlight the selec-
tion and press Enter.	Some PLC protocols require each device on the PLC net-
PLC Number	work to be assigned a unique address or ID. The DTU
	Address is the address assigned to the DTU on the PLC
After you have selected your PLC, the PLC Number selec-	network. Highlight this field and type in the address number
	for the DTU3005B, then press Enter.
tion box is highlighted. The PLC Number is used to identify
which PLC the DTU is to communicate with (if the selected	Communications Settings
type of PLC is addressable). The PLC Number is often
	The communications settings are automatically set to the
called a PLC Slave Address or Slave ID.
Type in the PLC Number and press Enter.	default values for each type of PLC when the PLC is first
	selected. Before changing any of these settings, consult
2-Wire RS422 or RS485 Communications	your PLC manual for the correct settings. To move between
	the communications settings, press the Tab or Enter keys.
After you have entered the PLC Number, the 2-Wire RS422	To select a setting, use the Up or Down Arrow key to move
	to the desired setting and press the spacebar to change
or RS485 Communications selection box is highlighted.
	your selection.
This box will only need to be checked if the communications
with your PLC is a 2-wire RS485 or RS422 interface. When	RTS Control (Request to Send Control)
2-wire communications are being used, RTS must be
	RTS Control selection is an option provided for modems or
looped back to CTS on the DTU side of the cable. This can
be done on the RS232 side by looping pins 4 and 5 or on	for PLCs that require RTS to be active only while the DTU is
the RS422/485 side by looping 16 to 18 and 17 to 19. See	transmitting to the PLC.
Appendix D for wiring diagrams for your particular PLC,	• If RTS/CTS is selected, the DTU will activate RTS and
and whether it uses a 2-wire connection.
To select the checkbox, click on it with the mouse or, with	wait until CTS is active before transmitting to the PLC.
	• If RTS Delay is selected, the DTU will activate RTS and
the 2-Wire RS422 or RS485 Communications selection
highlighted, press the spacebar. An “X” will appear inside	wait for the specified delay time to pass before trans-
the brackets when it is selected.	mitting to the PLC. When RTS Delay is selected, the

14 Siemens Energy & Automation, Inc.