Section 2.2 Power Requirements; Section 2.3 Setting The Dip Switch - Spectrum Controls SLC 500 User Manual

Electrical Equipment for Measurement, Control, and Laboratory Use - Part 2-
201: Particular Requirements for Control Equipment.
For specific information required by EN 61010-2-201, see the appropriate
sections in this publication, as well as the following Allen-Bradley publications:
• Industrial Automation Wiring and Grounding Guidelines For Noise
Immunity, publication 1770-4.1
• Automation Systems Catalog, publication B111.
This equipment is classified as open equipment and must be installed (mounted)
in an enclosure during operation as a means of providing safety protection.
Power
Requirements
The module receives power through the bus interface from the +5 VDC/+24
VDC system power supply. The maximum current drawn by the module is
shown in the table below:
Module
1746sc-INO4i
1746sc-INO4vi
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 the table above to calculate the total load on the system power supply. For
more information, see the Allen-Bradley system Installation and Operation
Manual.
Section 2.5
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:
•
•
5 VDC
120 mA
120 mA
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 from the backplane.
Chapter 2: Installation and Wiring
24 VDC w/o 24 VDC with
external external
supply supply
250 mA 0 mA
250 mA 0 mA
User's Manual Pub. 0300266-04 Rev. A
2-3