Rockwell Automation 1746-XXXX SLC 500 4-Channel Analog I/O Modules User Manual - Manual (Page 24)

Publication 1746-UM005B-EN-P - June 2004
3-2 Installing and Wiring Your Analog Module
Determining Your Power
Requirements for a
Modular Controller Analog modules require both 5V dc and 24V dc power from the
backplane of the SLC 500 system. However, the NO4I and NO4V
analog modules can use an external 24V dc power supply. This
eliminates the 24V dc backplane power requirement, providing
configuration flexibility if SLC power supply loading is critical. These
two modules provide user-supplied external 24V dc power supply
connections.
The 24V dc user power connection on a fixed SLC 500 can power an
NO4I or NO4V analog module. However, the regulation of the 24V dc
user connection on a modular SLC 500 power supply, Catalog Number
1746-P1, -P2, -P4 is outside of the requirements of the NO4I and
NO4V analog modules and cannot be used.
The following table shows the power requirements for each analog
module using backplane power. Use this table to calculate the total
load on the modular system power supply. For more information refer
to the SLC 500 user manual for modular controllers.
Determining Your Power
Requirements for a Fixed
Controller The chart starting on the next page provides available analog module
combinations in the expansion chassis of a fixed controller.
IMPORTANT
The analog modules do not supply loop power for
the input device. You must supply the appropriate
loop power for loop-powered input devices.
Catalog Number 5 Volt Current 24 Volt Current
1746-NI4 35 mA 85 mA
1746-NIO4I 55 mA 145 mA
1746-NIO4V 55 mA 115 mA
1746-NO4I 55 mA
195 mA (1)
(1) Omit these values from your SLC power supply loading calculations if you decide to use an external
power supply.
1746-NO4V 55 mA
145 mA
(1)
valid combination
invalid combination
valid combination when used with
external power supply ∇
•
BASIC net = Basic Module is supplying power to an
AIC. No other device requiring power is connected
to the AIC.