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A Appendix
GX-series EtherCAT Slave Unit User’s Manual
A-5 I/O Po
wer Sup
p
ly
Current
A
A-5 I/O Power Supply Current
The I/O power supply current to be supplied to the V and G terminals of each Digital I/O Slave Unit is
provided by the following equation.
The points to which I/O power must be supplied are divided into small blocks. The I/O power supply
currents supplied to these points are calculated in block units.
For example, in a GX-ID1612 Unit, the points are divided into two blocks. One includes 8 points on the
left: Inputs 0 to 7. The other contains 8 points on the right: Inputs 8 to 15. Currents are calculated for
each block.
 Input Slave Unit
I/O power supply current supplied to V and G terminals =(Current consumption of Input Slave Unit
from I/O power supply) + (Input current of
Input Slave Unit
×
Number of inputs used)
+ (Total current consumption of connected
input devices)*
* This value does not apply when two-wire input devices are connected.
Use the following formula when two-wire input devices are connected:
I/O power supply current supplied to V and G terminals = (Current consumption of Input Slave Unit from I/O
power supply) + (Input current of Input Slave Unit
×
Number of inputs used)
Example:
The following example is for when seven, three-wire sensors with a current consumption of 30 mA
each are connected to the GX-ID1612.
The GX-ID1612 specifications are,
•
Input current of 6.0 mA max./point (at 24 VDC)
•
I/O power supply current consumption of 10 mA max. (at 20.4 to 26.4 VDC).
Therefore,
I/O power supply current supplied to V and G terminals =10 mA + (6 mA
×
7 points) + (30 mA
×
7
points) = 262 mA
 Output Slave Unit
I/O power supply current supplied to V and G terminals =(Current consumption of Output Slave Unit
from I/O power supply) + (Total load
current of the connected loads) + (Total
current consumption of connected output
devices)
*1
*1 This value does not apply when two-wire output devices are connected.
Use the following formula when two-wire output devices are connected:
I/O power supply current supplied to V and G terminals = (Current consumption of Output Slave Unit from
I/O power supply) + (Total load current of the
connected loads)
*2 Compare the value from the above formula to the rated current (common) of the Output Slave Unit and use
the smaller value.
Example:
The following example is for when five relays with a load current of 20 mA each are connected to the
GX-OD1612.
The GX-OD1612 specifications are,