Mitsubishi Electric MELSEC iQ-R Series - Page 120

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5 INSTALLATION AND WIRING
5.5 Connection Method for the Extension Base Unit
■ When the Q6B is connected between the RQ extension base unit and the Q5B
The 5VDC output voltage of the power supply module on the Q6B is set to 4.90VDC (minimum value).
Therefore, the Q5B can be used when the voltage drop at the extension cable is 0.15VDC or lower (4.90VDC - 4.75VDC =
0.15VDC).
Diagonal lines show the power supply modules.
Symbol Description
V Voltage drop at the extension cable between the RQ extension base unit and the Q5B
In Current consumption (5VDC) when the Q5B is used as the extension level n+2 (n = 1 to 5), n: Extension level for the Q6B
(Sum total of the current consumption by the Q5B and current consumption by I/O modules and intelligent function modules
mounted on the Q5B)
Rn Resistance value for the extension cable between the RQ extension base unit and the Q6B or the Q6B and the Q6B
Rn+1 Resistance value for the extension cable between the Q6B and the Q5B
Mounting position Sum total (V) of the voltage drop at the extension cable from the main
base unit to the IN connector of the Q5B
Q6B Q5B
Extension level 2 Extension level 3 V=(R1+R2)I1
Extension level 2 to 3 Extension level 4 V=(R1+R2+R3)I2
Extension level 3 to 4 Extension level 5 V=(R1+R2+R3+R4)I3
Extension level 4 to 5 Extension level 6 V=(R1+R2+R3+R4+R5)I4
Extension level 5 to 6 Extension level 7 V=(R1+R2+R3+R4+R5+R6)I5
Q6B
Q6B
Q5B
In
V
Rn+1
Rn
Main base unit
RQ extension base
unit
Extension level n
Extension level n+1
Extension level n+2