MODULE POWER REQUIREMENTS
SIZING THE MODULAR POWER SYSTEM
I-E96-506B1 B - 5
The total current requirements of system powered analog
inputs, analog outputs, digital inputs, digital outputs, and
thermocouple inputs make up the system powered I/O current
requirements. Fill in column two of Table B-3, then multiply it
by column three (quantity of inputs or outputs times the cur-
rent per input or output). For digital outputs, specify the cur-
rent requirements for the digital outputs in your system.
Complete the calculation to determine the current require-
ments by filling in all five rows as necessary then totaling the
current requirements in column four.
SIZING THE MODULAR POWER SYSTEM
The following text and equations explain how to calculate the
number of IEPAS02 and IEPAF02 power supply modules
needed for a particular system.
Cabinet requirements for 5 VDC, +15 VDC, -15 VDC and
24VDC power are calculated by adding the individual module
current requirements. Refer to CALCULATING CURRENT
REQUIREMENTS in this section to determine the current
requirements of your system. Refer to product specifications
for current requirements of new modules not listed.
Sizing Systems with IEPAS02 Modules Only
A
Total 5 VDC current requirements for system cabinet.
B
Total 24 VDC current requirements for associated I/O.
C
Total +15 VDC current requirements for system cabi-
net.
D
Total -15 VDC current requirements for system cabinet.
Q1
Number of IEPAS02 power modules needed to meet
5 VDC current requirements.
Table B-3. System Powered I/O Current Consumption
Type of
Input/Output
No. of
Inputs/Ouputs
Current
Consumption per
Input/Output (mA)
Total Current
Consumption for
System Power I/O
Analog outputs 20
Analog inputs 20
TC inputs 20
Digital inputs 5
Digital outputs NOTE 1
Total I/O current
consumption
NOTE:
1. Use the typical current requirements of your particular digital outputs.
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