Rockwell Automation 1761-HHP-B30 MicroLogix 1000 with Hand-Held Programmer (HHP) - Manual (Page 66)

Use this write–on
area to mark the
DeviceNet node
Address.
DeviceNet
(Port 1)
(Replacement
connector part no.
– 1761–RPL– 0000)
RS–232
(Port 2)
V–
CAN_L
SHIEL
D CAN_H
V+
NET
MOD
NODE
DANGER
GND
TX/RX
DNI DeviceNet Interface
(1761-NET-DNI)
Chapter 3
Connecting the System
3–13
Automatic Protocol Switching
The MicroLogix 1000 Series D or later discrete and all MicroLogix 1000
analog controllers perform automatic protocol switching between DH-485
and the configured DF1 protocol. (The controller cannot automatically
switch between DF1 full-duplex and DF1 half-duplex slave.) This feature
allows you to switch from active communication on a DF1 half-duplex
network to the DH-485 protocol to make program changes.
Simply disconnect the MicroLogix controller from the DF1 half-duplex
network and connect it to your personal computer. The controller recognizes
the computer is attempting to communicate using the DH-485 protocol and
automatically switches to it. When your program changes are complete, you
can disconnect your computer, reconnect the modem, and the controller
automatically switches back to the configured DF1 protocol. For example, if
you are using the DH-485 protocol to make program changes and you
connect an HHP, you can switch to active communication on a DF1
full-duplex network.
The following baud rate limitations affect autoswitching:
•
If the configured DH-485 baud rate is 19200, the configured DF1 baud
rate must be 4800 or greater.
•
If the configured DH-485 baud rate is 9600, the configured DF1 baud rate
must be 2400 or greater.
You can also connect a MicroLogix to a DeviceNet network using the
DeviceNet Interface (DNI), catalog number 1761-NET-DNI. For additional
information on connecting the DNI, see the Advanced Interface Converter
(AIC+) and DeviceNet Interface (DNI) Installation Instructions, Publication
1761-5.11. For information on how to configure and commission a DNI, see
the DeviceNet Interface User Manual, Publication 1761-6.5.
The figure that follows identifies the ports of the DNI.
DeviceNet Communications