Rockwell Automation Publication 1766-UM001O-EN-P - September 2021 73
Chapter 4 Communication Connections
Power the AIC+
MicroLogix 1000, 1200, and 1500 programmable controllers support 24V DC
communication power on Channel 0. When connected to the 8-pin mini-DIN
connector on the 1761-NET-AIC, 1761-NET-ENI, and the 1761-NET-ENIW, these
controllers provide the power for the interface converter modules. The
MicroLogix 1400 does not provide 24V DC communication power through
communication ports. Instead these pins are used to provide RS-485
communications directly. Any AIC+, ENI, or ENIW not connected to a
MicroLogix 1200 controller requires a 24V DC power supply.
If both the controller and external power are connected to the AIC+, the power
selection switch determines what device powers the AIC+.
Set the DC Power Source selector switch to EXTERNAL before connecting the
power supply to the AIC+. Figure 55
shows where to connect external power for
the AIC+.
Figure 55 - External Power for AIC+
Power Options
Below are two options for powering the AIC+:
• Use the 24V DC user power supply built into the MicroLogix 1000, 1200,
or 1500 controller. The AIC+ is powered through a hard-wired connection
using a communication cable (1761-CBL-HM02, or equivalent) connected
to port 2.
• Use an external DC power supply with the following specifications:
- operating voltage: 24V DC (-15%/+20%)
- output current: 150 mA minimum
- rated NEC Class 2
Make a hard-wired connection from the external supply to the screw
terminals on the bottom of the AIC+.
ATTENTION: If you use an external power supply, it must be
24V DC (-15%/+20%). Permanent damage results if a higher voltage supply is
used.
ATTENTION: Always connect the CHS GND (chassis ground) terminal to the
nearest earth ground. This connection must be made whether or not an external
24V DC supply is used.
ATTENTION: If you use an external power supply, it must be 24V DC (-15%/
+20%). Permanent damage results if mis-wired with the wrong power source.
24V
DC
DC
NEUT
CHS
GND
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