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MELSEC-Q
6 BASE UNIT AND EXTENSION CABLE
List for Calculating Voltage Drops Occurring at Extension Cables when connecting
Q6B between Q3B and Q5B
Position of extension base unit
Q6
B Q5
B
Voltage drop caused by extension
cable from the main base unit to the
Q5
B IN connector (V)
Extension stage 1 Extension stage 2 V=(R1+R2)I1
Extension stage 1,
Extension stage 2
Extension stage 3 V=(R1+R2+R3)I1
Extension stage 1 to 3 Extension stage 4 V=(R1+R2+R3+R4)I1
Extension stage 1 to 4 Extension stage 5 V=(R1+R2+R3+R4+R5)I1
Extension stage 1 to 5 Extension stage 6 V=(R1+R2+R3+R4+R5+R6)I1
Extension stage 1 to 6 Extension stage 7 V=(R1+R2+R3+R4+R5+R6+R7)I1
The voltage supplied to the "IN" connector of the Q5B reaches 4.75 VDC or
higher on the condition that the voltage drop (V) at the extension cable between
the main base unit and Q5B is 0.15 VDC or lower.
(3) When the GOT is bus-connected
(a) Selection condition
4.75VDC or higher should be supplied to the "IN" connector of the Q5B.
(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 Q5B can be used if the voltage drop is 0.15VDC or lower
(4.9VDC - 4.75VDC = 0.15VDC).
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
R1
I1
GOT
GOT
I2
Power
supply
module
Extension base unit (Q5 B)
Number of GOTs connected : Max. 5 unit
s
Main base unit (Q3 B)
Symbol Description
V Voltage drop at the extension cable between the main base unit and extension base unit (Q5B)
In
5VDC current consumption when the Q5B is used as Extension n+1, n = 1 to 5, n: Extension No. of the
Q6B connected
(Sum total of current consumed by Q5B and currents consumed by I/O, intelligent function modules loaded
on the Q5B)
Im
5VDC current consumption of the GOT (current consumption per GOT is 254mA)
• Im = 254
c (c: Number of GOTs connected (c: 1 to 5))
Rn
Extension cable resistance between the main base unit or the extension base unit (Q6B) and extension
base unit (Q6B)
Rn+
1
Extension cable resistance between the extension base unit (Q6B) and extension base unit (Q5B)