Allen-Bradley SLC 500 1746-NI4 Installation Instruction page 8

8 SLC 500™ Analog I/O Modules
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
requirements, providing configuration flexibility if SLC power supply loading is
critical. These two modules provide user-supplied external 24V dc power supply
connections.
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 Modular Hardware
Style Installation and Operation Manual, publication 1747-6.2.
IMPORTANT
Catalog Number
1746-NI4
1746-NIO4I
1746-NIO4V
1746-NO4I
1746-NO4V
1746-FIO4I
1746-FIO4V
(1) 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, and -P4 is outside of the requirements of the NO4I and
NO4V analog modules and cannot be used.
(2) Omit these values from your SLC power supply loading calculations if you decide to use an
external power supply.
Publication 1746-IN008A-US-P
The analog modules do not supply loop power for the input
device. You must supply the appropriate loop power for
loop-powered input devices.
5 Volt Current
35 mA
55 mA
55 mA
55 mA
55 mA
55 mA
55 mA
24 Volt Current
85 mA
145 mA
115 mA
(1) (2)
195 mA
(1) (2)
145 mA
150 mA
120 mA