Rockwell Automation 1761-HHP-B30 MicroLogix 1000 with Hand-Held Programmer (HHP) - Manual (Page 65)

Chapter 3
Connecting the System
3–12
!
ATTENTION: If you use an external power supply, it must be
24V dc. Permanent damage will result if miswired with the
wrong power source.
Installing and Attaching the AIC+
1. Take care when installing the AIC+ in an enclosure so that the cable
connecting the MicroLogix 1000 controller to the AIC+ does not interfere
with the enclosure door.
2. Carefully plug the terminal block into the DH-485 port on the AIC+ you
are putting on the network. Allow enough cable slack to prevent stress on
the plug.
3. Provide strain relief for the Belden cable after it is wired to the terminal
block. This guards against breakage of the Belden cable wires.
When you connect a MicroLogix 1000 controller, it automatically determines
which protocol is active (DF1 or DH-485), and establishes communication
accordingly. Therefore, no special configuration is required to connect to
either network.
However, to shorten the connection time, you can specify which protocol the
controller should attempt to establish communication with first. This is done
using the Primary Protocol bit, S:0/10. The default setting for this bit is DF1
(0). If the primary protocol bit is set to DF1, the MicroLogix 1000 controller
will attempt to connect using the configured DF1 protocol: either full-duplex
or half-duplex slave. To have the controller first attempt DH-485
communication, set this bit to 1.
For DH-485 networks that will only contain MicroLogix controllers, at least
one controller must have its primary protocol bit set to 1 so that the network
can be initialized.
Establishing Communication