Mitsubishi Electric Q26UD(E)HCPU User Manual page 91

(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).
Main base unit
Power
supply
module
V1 Extension base unit (Q5
R1
I1
V2
Extension base unit (Q5
R2
I2
V7 Extension base unit (Q5
R7
I7
Symbol
V1 Voltage drop at the extension cable between the main base unit and extension base unit (Q5B, QA1S5B)
Voltage drop at the extension cable between the extension base unit (Q5B, QA1S5B) (extension stage n-1) and extension
Vn
base unit (Q5B, QA1S5B) (extension stage n)
R1 Extension cable resistance between the main base unit and extension base unit (Q5B, QA1S5B)
Extension cable resistance between the extension base unit (Q5B, QA1S5B) (extension stage n-1) and extension base
Rn
unit (Q5B, QA1S5B) (extension stage n)
l1 to l7
5VDC current consumption among extension base 1 to 7
*1 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. The symbols including "I" (I1 to I7) vary with the modules mounted on the
Q5B, QA1S5B. For details of the symbol, refer to the user's manuals for the modules used.
.
Extension cable type
B)
Extension
stage 1
B)
Extension
stage 2
B, QA1S5 B)
Extension
stage 7
Description
*1
CHAPTER 4 INSTALLATION AND WIRING
Extension cable conductor
QC05B
QC06B
QC12B
QC30B
QC50B
QC100B
resistance
0.044
0.051

0.082
4

0.172

0.273

0.530
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