■ When only the Q5B 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 Q5B can be used when the voltage drop at the extension cable is 0.15VDC or lower (4.90VDC - 4.75VDC =
0.15VDC).
Main base unit
RQ extension base
unit
V1
R1
Q5 B
I1
V6
R6
Q5 B
I6
Diagonal lines show the power supply modules.
Symbol
Description
V1
Voltage drop at the extension cable between the RQ extension base unit and the Q5B
Vn
Voltage drop at the extension cable between the Q5B 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 Q5B
Rn
Resistance value for the extension cable between the Q5B 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 Sum total (I1 to I6) of the current consumption by the Q5B and current consumption by I/O modules and intelligent function modules
mounted on the Q5B differs depending on modules mounted on the Q5B. For detail, refer to the following.
User's manual for the module used
Mounting
Voltage drop for the extension cable at each extension level
position of
V1
the Q5B
Extension
R1I1
level 2
Extension
R1(I1+I2)
level 3
Extension
R1(I1+I2+I3)
level 4
Extension
R1(I1+I2+I3+I4)
level 5
Extension
R1(I1+I2+I3+I4+
level 6
I5)
Extension
R1(I1+I2+I3+I4+
level 7
I5+I6)
Extension level 1
Extension level 2
Extension level 7
V2
V3
R2I2
R2(I2+I3)
R3I3
R2(I2+I3+I4)
R3(I3+I4)
R2(I2+I3+I4+I5)
R3(I3+I4+I5)
R2(I2+I3+I4+I5+
R3(I3+I4+I5+I6)
I6)
*1
V4
V5
R4I4
R4(I4+I5)
R5I5
R4(I4+I5+I6)
R5(I5+I6)
5.5 Connection Method for the Extension Base Unit
Sum total (V) of
voltage drops to IN
V6
connector of the
Q5B
V=V1
V=V1+V2
V=V1+V2+V3
V=V1+V2+V3+V4
V=V1+V2+V3+V4+V5
R6I6
V=V1+V2+V3+V4+V5+V6
5 INSTALLATION AND WIRING
5
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