Mitsubishi Electric Q26UD(E)HCPU User Manual page 93

(2) When the Q6B or QA1S6B is connected between the main base unit and
the Q5B or QA1S5B
(a) Selection condition
4.75VDC or higher must be supplied to the "IN" connector of the Q5B or QA1S5B in the final extension
base.
(b) How to calculate voltage to "IN" connector
The 5VDC output voltage of the power supply module on the main base unit is set to at least 4.90VDC.
Therefore, the Q5B or QA1S5B can be used if the voltage drop at the extension cable is 0.15VDC or lower
(4.9VDC - 4.75VDC = 0.15VDC).
[When the Q5B or QA1S5B is connected
to Extension stage 2]
Main base unit
Power
supply
module
Extension base unit (Q6
R1
Power
supply
module
V
Extension base unit (Q5
R2
I1
Symbol
V Voltage drop at the extension cable between the main base unit and extension base unit (Q5B, QA1S5B)
5VDC current consumption when the extension base unit (Q5B, QA1S5B) is used as Extension stage n+1
n = 1 to 6, n: Extension number of extension base unit (Q6B) connected
In
(Sum total of currents consumed by Q5B, QA1S5B and currents consumed by the I/O modules, intelligent function
modules mounted on the Q5B, QA1S5B.)
Extension cable resistance between the main base unit and the extension base unit (Q6B, QA1S6B) or the extension base
Rn
unit (Q6B, QA1S6B) and the extension base unit (Q6B, QA1S6B)
R Extension cable resistance between the extension base unit (Q6B, QA1S6B) and extension base unit (Q5B, QA1S5B)
n+1
Position of extension base unit
Q6B, QA1S6B
Extension1
Extension 1, Extension 2
Extension 1 to 3
Extension 1 to 4
Extension 1 to 5
Extension 1 to 6
The voltage supplied to the "IN" connector of the Q5B or QA1S5B reaches 4.75 VDC or higher on the condition
that the voltage drop (V) at the extension cable between the main base unit and Q5B or QA1S5B is 0.15 VDC or
lower.
B, QA1S6 B)
Extension
stage 1
B, QA1S5 B)
Extension
stage 2
Description
base unit to IN connector of the Q5B or QA1S5B (V)
Q5B, QA1S5B
Extension 2 V=(R1+R2)I1
Extension 3 V=(R1+R2+R3)I2
Extension 4 V=(R1+R2+R3+R4)I3
Extension 5 V=(R1+R2+R3+R4+R5)I4
Extension 6 V=(R1+R2+R3+R4+R5+R6)I5
Extension 7 V=(R1+R2+R3+R4+R5+R6+R7)I6
CHAPTER 4 INSTALLATION AND WIRING
Extension cable type
QC05B
QC06B
QC12B
QC30B
QC50B
QC100B
Voltage drop caused by extension cable from the main
Extension cable conductor
resistance
0.044
0.051
0.082
0.172
0.273
0.530
91
4