Rockwell Automation 1732E-OB8M8SR EtherNet/IP Dual Port 8-Point SOE Input and Scheduled Output Modules UM - Manual (Page 31)

Rockwell Automation Publication 1732E-UM003B-EN-E - March 2014 21
Install Your Module Chapter 4
Micro-style 4-Pin Input Male Receptacle
The power required by the module is based on a 4-pin micro-style connector
system. The module receives its required power through the male connector on
the left. A female connector on the right is also provided so that power can be
daisy-chained from module to module.
Both modules require two 24V DC (nominal) supplies. These supplies are called
the Module Power and the Auxiliary Power. The Module Power powers the
microprocessor and Ethernet portions of the module. The Auxiliary Power
provides power for the Digital Outputs, the Digital Inputs, and the Sensor
Voltage.
Internally, the Module Power and Auxiliary Power are isolated from each other.
The Module Power current required for a module can be estimated as 2.4W/
(Module Power Voltage). For example, if the Module Power Voltage is 24V DC,
then the Module Power current (Imp) would be,
Imp ~ 2.4W/24VDC = 100 mA DC
If the power for four modules were daisy-chained together and the voltage is 24V
DC, then the Module Power current through the first connector in the daisy-
chain would be 4 x Im ~ 400 mA which is less than 4 A, so Module Power current
is within acceptable limits.
The Auxiliary Power current is more complicated. The equation is below:
Iap ~ Iapm + Isp0 + Isp1+ Isp2+ Isp3 + Isp5+ Isp5 + Isp6 + Isp7 + IDO0
+ IDO1 + IDO2 + IDO3 + IDO4 + IDO5 + IDO6 + IDO7 +
IAPDC
Where:
Iap
is the Auxiliary Power current through the first connector in the daisy-chain.
Iapm is the Auxiliary Power current required by the module itself.
IspN is the Sensor Power current for Digital Input N (0…7).
I DON is the Digital Output current for Digital Output N (0…7).
I APDC is the Auxiliary Power current requirement for the remaining modules in
the daisy-chain.
Iapm
can be approximated by 0.5W/(Auxiliary Power Voltage).
IMPORTANT The maximum current that any pin on the power connectors can
carry is 4 A.
1
4
3
2
3
4
1
2
45764
(View into receptacle)
Pin 1 Auxiliary power+
Pin 2 Module power+
Pin 3 Module power-
Pin 4 Auxiliary power-
45763
Male Input Female Output