Mitsubishi Electric MELSEC iQ-R Series - Page 119

5 INSTALLATION AND WIRING
5.5 Connection Method for the Extension Base Unit
117
5
■ When only the Q5B is connected to the lower level of the RQ extension base unit
The 5VDC output voltage of the power supply module on the RQ extension base unit 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).
*1 Sum total (I1 to I6) of the current consumption by the Q5B and current consumption by I/O modules and intelligent function modules
mounted on the Q5B differs depending on modules mounted on the Q5B. For detail, refer to the following.
 User's manual for the module used
Diagonal lines show the power supply modules.
Symbol Description
V1 Voltage drop at the extension cable between the RQ extension base unit and the Q5B
Vn Voltage drop at the extension cable between the Q5B set as the extension level n and the extension level n+1
R1 Resistance value for the cable between the RQ extension base unit and the Q5B
Rn Resistance value for the extension cable between the Q5B set as the extension level n and the extension level n+1
I1 to I6 Current consumption value (5VDC) at the extension level 2 to 7
*1
Mounting
position of
the Q5B
Voltage drop for the extension cable at each extension level Sum total (V) of
voltage drops to IN
connector of the
Q5B
V1 V2 V3 V4 V5 V6
Extension
level 2
R1I1 V=V1
Extension
level 3
R1(I1+I2) R2I2 V=V1+V2
Extension
level 4
R1(I1+I2+I3) R2(I2+I3) R3I3 V=V1+V2+V3
Extension
level 5
R1(I1+I2+I3+I4) R2(I2+I3+I4) R3(I3+I4) R4I4 V=V1+V2+V3+V4
Extension
level 6
R1(I1+I2+I3+I4+
I5)
R2(I2+I3+I4+I5) R3(I3+I4+I5) R4(I4+I5) R5I5  V=V1+V2+V3+V4+V5
Extension
level 7
R1(I1+I2+I3+I4+
I5+I6)
R2(I2+I3+I4+I5+
I6)
R3(I3+I4+I5+I6) R4(I4+I5+I6) R5(I5+I6) R6I6 V=V1+V2+V3+V4+V5+V6
Q5B
Q5B
I1
I6
V1
V6
R6
R1
 
Main base unit
RQ extension base
unit
Extension level 1
Extension level 2
Extension level 7