Rockwell Automation 1764-xxxx MICROLOGIX 1500 PROGRAMMABLE CONTROLLERS - Manual (Page 151)

Publication 1764-UM001B-EN-P - April 2002
System Loading and Heat Dissipation F-5
System Using a 1769-PA2
To validate your system, the total 5V dc current and 24V dc current
consumed must be considered. The I/O modules must be distributed,
such that the current consumed from the left or right side of the
power supply never exceeds 2A at 5V dc and 1.0A at 24V dc. Use the
current graphs below to determine if the power supply loading in
your system is within the allowable range.
Figure F.1 1769-PA2 Current with +24V dc User Load = 0A
Table F.5 Bank 1 Power Supply Loading - Verify the Current Limits
Specification Catalog Number Calculated Current for System 24V dc User Output
Capacity
at 5V dc (mA) at 24V dc (mA)
Values from SUBTOTAL2 (Table F.2): (C) (D)
MAXIMUM CURRENT LIMIT 1769-PA2 2000 800 250 mA
1769-PA4 4000 2000 n/a
1769-PB2 2000 800
1769-PB4 4000 2000
I/O Distribution - Distribute I/O modules
such that the current consumed from either
the left side or the right side of the power
supply never exceeds the following values: 1769-PA2 2000 800 250 mA
1769-PA4 2000 1000 n/a
1769-PB2 2000 800
1769-PB4 2000 1000
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
0.0
0.5
1.0
1.5
2.0
+5
V
d
c
L
o
ad
(
A
m
p
s)
+24V dc Load (Amps)
Valid Operating Range