Rockwell Automation 1785 PLC-5 User Manual Page 29

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Choosing Hardware
Chapter 2
2-10
3. Add to the total of the I/O module backplane current draw either:
a. 3.3 Amps when the chassis will contain a PLC-5 processor
(maximum current draw for any PLC-5 processor) or
b. 1.2 Amps when the chassis will contain either a remote I/O
1771-AS or -ASB module or a 1771-ALX extended-local I/O
adapter module
4. If you leave slots available in your chassis for future expansion:
a. list backplane current draw for future I/O modules
b. add the total current draw for all expansion I/O modules to the
total calculated in step 3.
5. Determine whether the available space for the power supply is in the
chassis or mounted external to the chassis.
Choose your power supply from Table 2.K or Table 2.L using the input
voltage requirement and the total backplane current draw as determined in
the previous steps, 1 through 5.
See the Automation Products Catalog, publication AP100, for more
information on power supplies.
Powering a Chassis Containing a PLC5 Processor
Table 2.K lists the power-supply modules that you can use with a Classic
PLC-5 processor.
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