60
4 SYSTEM CONFIGURATION
4.4 Limitation on Current Consumption
When connecting an input module after (on the right side of) the extension power supply module
When using 24 V DC service power supply of the CPU module or powered input/output module for input
circuit of an input module, include the input module in the 24 V DC current consumption calculation.
5 V DC power supply of the input module is supplied from the extension power supply module.
3.
Calculate the total current consumption of each power supply.
4.
Check if expansion to the extension power supply module is permitted.
• 5 V DC power supply
• 24 V DC power supply
If the calculation result is a negative value, the current consumption exceeds the power supply capacity of the extension
power supply module.
Reconfigure the system, adding powered input/output module or extension power supply modules.
Power supply type
Total current consumption
5 V DC power supply
400 mA
24 V DC power supply
125 mA
Power supply from CPU module or
powered input/output module
CPU module,
Powered
input/output
module
Intelligent
module
Extension
power
supply
module
When the CPU module or powered input/output
module supplies the 24 V DC power supply for the
input circuit, current consumption of 24 V DC should
be included in the supply range from the CPU module
or powered input/output module.
Input
module
Input
module
Intelligent
module
Ex.
-
≥
0 mA
=
Ex.
Total of current consumed
by extension module
Current consumption
mA
400 mA
Extension power
supply module
Capacity of 5 V DC
power supply
mA
1200 mA
Calculation result
mA
800 mA
mA
-
mA
Current consumption
mA
≥
0 mA
=
Calculation result
Ex.
125 mA
300 mA
175 mA
Capacity of 24 V DC
power supply
Extension power
supply module
Total of current
consumed by extension
module
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