Mitsubishi Electric Q26UD(E)HCPU - Page 93

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CHAPTER 4 INSTALLATION AND WIRING
4
4.3 Connecting an Extension Base Unit 4.3.4 Voltage drop when an extension base unit is used
(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).
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.
[When the Q5B or QA1S5B is connected
to Extension stage 2]
Extension cable type
Extension cable conductor
resistance
QC05B 0.044
QC06B 0.051
QC12B 0.082
QC30B 0.172
QC50B 0.273
QC100B 0.530
Symbol Description
V Voltage drop at the extension cable between the main base unit and extension base unit (Q5B, QA1S5B)
In
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
(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.)
Rn
Extension cable resistance between the main base unit and the extension base unit (Q6B, QA1S6B) or the extension base
unit (Q6B, QA1S6B) and the extension base unit (Q6B, QA1S6B)
R
n+1
Extension cable resistance between the extension base unit (Q6B, QA1S6B) and extension base unit (Q5B, QA1S5B)
Position of extension base unit
Voltage drop caused by extension cable from the main
base unit to IN connector of the Q5B or QA1S5B (V)
Q6B, QA1S6B Q5B, QA1S5B
Extension1 Extension 2 V=(R1+R2)I1
Extension 1, Extension 2 Extension 3 V=(R1+R2+R3)I2
Extension 1 to 3 Extension 4 V=(R1+R2+R3+R4)I3
Extension 1 to 4 Extension 5 V=(R1+R2+R3+R4+R5)I4
Extension 1 to 5 Extension 6 V=(R1+R2+R3+R4+R5+R6)I5
Extension 1 to 6 Extension 7 V=(R1+R2+R3+R4+R5+R6+R7)I6
Extension
stage 1
Extension
stage 2
V
R1
R2
I1
Power
supply
module
Power
supply
module
Main base unit
Extension base unit (Q6 B, QA1S6 B)
Extension base unit (Q5 B, QA1S5 B)