Mitsubishi Electric Q26UD(E)HCPU User Manual page 94

(3) When the GOT is bus-connected
(a) Selection condition
4.75VDC or higher should be supplied to the "IN" connector of the Q5B in the final extension.
(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 can be used if the voltage drop is 0.15VDC or lower (4.9VDC -4.75VDC = 0.15VDC).
[When the Q5 B is connected to Extension stage 2.]
Power
supply
module
Extension base unit (Q6 B)
R1
Power
supply
V
module
Extension base unit (Q5 B)
R2
I1
GOT
Im
Number of connectable GOTs: up to 5
Symbol
V Voltage drop at the extension cable between the main base unit and extension base unit (Q5B)
5VDC current consumption when the extension base unit (Q5B) is used as Extension n+1,
In n = 1 to 5, n: Extension number of the extension base unit (Q6B) connected
(Sum total of current consumed by Q5B and currents consumed by I/O, intelligent function modules loaded on the Q5B)
5VDC current consumption of the GOT (current consumption per GOT is 255mA)
Im
• Im = 255 × c (c: Number of GOTs connected (c: 1 to 5))
Extension cable resistance between the main base unit and extension base unit (Q6B) or the extension base unit (Q6B)
Rn
and extension base unit (Q6B)
R Extension cable resistance between the extension base unit (Q6B) and extension base unit (Q5B)
n+1
92
Main base unit
Extension
stage 1
Extension
stage 2
GOT
Extension
stage 3
Extension cable type
QC05B
QC06B
QC12B
QC30B
QC50B
QC100B
Description
Extension cable conductor
resistance
0.044
0.051
0.082
0.172
0.273
0.530