82 Rockwell Automation Publication 1766-UM001I-EN-P - June 2015
Chapter 4 Communication Connections
Powering 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 1000, 1200, or 1500 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+. The following illustration shows where to connect
external power for the 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
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.
24V
DC
DC
NEUT
CHS
GND
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