Spectrum Controls 1746sc-CTR4 - Manual (Page 13)

Chapter 2: Installing And Wiring Your Module
13
Determining Power
Requirements
The backplane of the system can provide both 5 Vdc and 24 Vdc power.
The following table shows the maximum current consumed by your module
when using these power sources:
Table 2.1. Backplane current consumed
Catalog Number 5 Vdc 24 Vdc
1756sc-CTR8 230 mA 75 mA
Use Table 2.1 to calculate the total load on the system power supply. For
more information, see the Allen-Bradley system Installation and
Operation Manual.
Selecting a Rack Slot
Two factors determine where you should install your module in the rack:
ambient temperature and electrical noise. When selecting a slot for your
module, try to position your module:
• in a rack close to the bottom of the enclosure (where the air is cooler)
• away from modules that generate significant heat, such as 32-point
input/output modules
• in a slot away from ac or high-voltage dc modules, hard contact
switches, relays, and ac motor drives
• away from the rack power supply (if using a modular system)
Remember that in a modular system, the processor always occupies the
first slot of the rack.