Mitsubishi Electric Q26UD(E)HCPU - Page 91

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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
(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).
.
*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
Extension cable conductor
resistance
QC05B 0.044
QC06B 0.051
QC12B
0.082
QC30B
0.172
QC50B
0.273
QC100B
0.530
Symbol Description
V1 Voltage drop at the extension cable between the main base unit and extension base unit (Q5B, QA1S5B)
Vn
Voltage drop at the extension cable between the extension base unit (Q5B, QA1S5B) (extension stage n-1) and extension
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)
Rn
Extension cable resistance between the extension base unit (Q5B, QA1S5B) (extension stage n-1) and extension base
unit (Q5B, QA1S5B) (extension stage n)
l1 to l7
5VDC current consumption among extension base 1 to 7
*1
Extension
stage 1
Extension
stage 2
Extension
stage 7
V1
V2
V7
R1
R2
R7
Main base unit
I1
I2
I7
Power
supply
module
Extension base unit (Q5 B)
Extension base unit (Q5 B)
Extension base unit (Q5 B, QA1S5 B)