
Publication 1746-6.1.2 - July 2000
2-4
Selecting Power Supplies, Encoders, and Drives
Example of the Calculations for User-Side Current Requirements
In this example, the system includes:
• One seven-slot modular rack
• One 1747-L541 CPU module
• One 1746-IB8 DC input module with eight inputs @ +24V
• One 1746-OV8 DC output module with eight outputs @ +24V
• An SLC Servo Module system that contains:
• Two SLC Servo Modules
• Two termination panels
• Two Allen-Bradley 845H encoders
• Six fast inputs
• Two fast outputs
Use the table below to find the current requirements of the devices
that draw user-side power.
Using Fast Inputs and
Outputs
The fast I/O (FIN1through FIN3, and FOUT1) are 24V DC compatible
and are used with a user-side +24V power supply. Review potential
Device +5V +15V –15V +24V
1746-IB8 0 0 0 .064A
1746-OV8 0 0 0 .800A
SLC Servo
Module
.150A .030A .030A 0
Estop circuitry 0 0 0 .100A
6 fast inputs 0 0 0 .015A
2 fast outputs 0 0 0 .100A
845H encoder .200A 0 0 0
845H encoder .200A 0 0 0
Total = .700A Total = .060A Total = .060A Total = 1.079A
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