Rockwell Automation 1746-XXXX SLC 500 4-Channel Analog I/O Modules Installation Instructions - Manual (Page 8)

8 SLC™ 500 4-Channel Analog I/O Modules
Publication 1746-IN008C-EN-P - May 2004
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
User Manual, publication 1747-UM011.
Determining Your Power Requirements for 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) (2)
(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.
1746-NO4V 55 mA
145 mA (1) (2)
1746-FIO4I 55 mA 150 mA
1746-FIO4V 55 mA 120 mA
IMPORTANT
The 2-slot, SLC 500 fixed I/O expansion chassis (1746-A2) will
support only specific combinations of modules. If you wish to
use an I/O module in a 2-slot expansion chassis with another
SLC I/O or communication module, refer to the SLC 500
Analog I/O Modules User Manual, publication 1746-UM005 for
valid combinations of modules.
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