Spectrum Controls 1746sc-INO4vi - Manual (Page 17)

Chapter 2: Installing And Wiring Your Module 7
Table 6. Backplane current consumed
24 Vdc *
Catalog Number 5 Vdc w/o ext. supply w/ ext. supply
1746-sc-INO4i 120 mA 250 mA 0 mA
1746sc-INO4vi 120 mA 250 mA 0 mA
* The 1746sc-INO4i and 1746sc-INO4vi output modules can use an external 24 Vdc power
supply to reduce backplane loading. To use an external 24 Vdc power supply, you must set
your module’s DIP switch as indicated in the following subsection.
Use Table 6 to calculate the total load on the system power supply. For
more information, see the Allen-Bradley system Installation and
Operation Manual.
Setting The DIP Switch The 1746sc-INO4i and 1746sc-INO4vi output modules have an external
24 Vdc power switch, SW1, giving you the option of using an external
power supply:
• With the switch in the RACK position, the module draws all its power
from the backplane of the SLC system.
• With the switch in the EXT position, the module draws its 24 Vdc
power from an external power source; however, the module still draws
its 5 Vdc power from the backplane.
The switch, SW1, is located in the bottom corner of the module’s large
circuit board.
1
RACK
EXT
SW1