Allen-Bradley MicroLogix 1200 User Manual page 136

F-2 System Loading and Heat Dissipation
Table F.2 Calculating the Current for Expansion I/O
(1)
Catalog Number
1762-IA8
1762-IF4
1762-IF2OF2
1762-IQ8
1762-IQ16
1762-IR4
1762-IT4
1762-OA8
1762-OB8
1762-OB16
1762-OF4
1762-OW8
1762-OW16
1762-OX6I
Total Modules (6 maximum):
(1) Refer to your expansion I/O Installation Instructions for Current Requirements not listed in this table.
Publication 1762-UM001D-EN-P - March 2004
n A
Number of Device Current Requirements
Modules (max)
at 5V dc (mA)
2 50
40
40
50
60
40
40
115
115
175
40
2 80
120
110
4 Subtotal 2:
Validating the System
The example systems shown in the tables below are verified to be
acceptable configurations. The systems are valid because:
• Calculated Current Values < Maximum Allowable Current
Values
• Calculated System Loading < Maximum Allowable System
Loading
B n x A
Calculated Current
at 24V dc (mA) at 5V dc (mA)
0 100
50
105
0
0
50
50
0
0
0
165
90 160
140
110
260
n x B
at 24V dc (mA)
0
180
180