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17. BASE UNIT AND EXTENSION CABLE
(3) Calculation example
Since the voltage drop is higher than 0.15V, the A55B cannot be used as the 2nd
extension base under this condition. In this case, the A55B can be used by changing
the cable to AC06B (resistance value = 0.019 ).
Receiving port voltage of the 2nd extension base is:
4.9 - 0.133 = 4.767V
Since the voltage drop is less than 0.15V, the A55B can be used as the 2nd
extension base under this condition.
REMARK
When any of the A62B, A65B, A68B is connected between the main base unit and
the A52B, A55B, or A58B, calculate a voltage drop by the following.
• Calculate the total resistive value for the extension cables, which are connected
from the main base unit to the A52B, A55B, or A58B via the A62B, A65B, or A68B.
• Calculate a 5VDC consumption current for the A52B, A55B, or A58B, which flows
thorough the extension cables.
V
1
= 0.019 (3 + 2)
= 0.095[V]
V
2
= 0.019 2
= 0.038[V]
V
1 + V2 = 0.133[V]
POINT
When using an I/O module or special function module whose internal current
consumption is large, mount it on a main base unit or an extension base unit that
requires a power supply module (A62B, A65B, A68B).
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