Mitsubishi Q2ACPU, Руководство пользователя

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17.
17 - 5
BASE UNIT AND EXTENSION CABLE
17.3 Application Standards of Extension Base Units (A52B, A55B, A58B)
To the A52B, A55B and A58B extension base units, 5VDC is supplied from the power
supply module on the main base unit. (Power is not supplied from any power supply
module on the A62B, A65B and A68B.)
Therefore, if a voltage drop occurs on an extension cable, the specified voltage may not
supplied to the receiving end, resulting in erroneous inputs and outputs.
It is recommended to connect the A52B, A55B and/or A58B after a main base unit to
minimize a voltage drop.
Determine applicability of the A52B, A55B and A58B by the following calculation method.
(1) Selection condition
(a) Voltage of 4.75VDC or more is identified on the receiving end of the base unit.
(2) Calculation of the voltage on the receiving end
(a) The 5VDC output voltage of the power supply module drops to 4.9V.
(b) Resistance value of the cable
AC06B..........0.019
AC12B..........0.028
AC30B..........0.052
The voltage of the receiving end on the 2nd extension base is:
Voltage on receiving end = 4.9 - (V
1
+ V
2
) 4.75
where the above condition is satisfied by:
Under the above conditions, the A52B, A55B or A58B can be used as the 2nd
extension base.
Therefore, how many A52B, A55B or A58B extension base units can be used
and where each of them can be placed is dependant on whether the following
condition is satisfied or not.
0.15 Total voltage drop up to receiving end
4.9 - 4.75
V
1
+ V
2
0.15 R
1
(I
1
+ I
2
) + R
2
I
2