Filter
Top Products
6 - 9 6 - 9
MELSEC-Q
6 BASE UNIT AND EXTENSION CABLE
List for Calculating Voltage Drops Occurring at Extension Cables in System Consisting of Extensions 1 to 7
Voltage Drop at Extension Cable on Corresponding Extension Unit
Q5
B
Loading
Position
V1 V2 V3 V4 V5 V6 V7
Sum Total of Voltage
Drops to "IN" Connector
of Q5
B (V)
Extension
stage 1
R1 • I1 ---- ---- ---- ---- ---- ---- V=V1
Extension
stage 2
R1(I1+I2) R2 • I2 ---- ---- ---- ---- ---- V=V1+V2
Extension
stage 3
R1(I1+I2+I3) R2(I2+I3) R3 • I3 ---- ---- ---- ---- V=V1+V2+V3
Extension
stage 4
R1(I1+I2+I3+I4) R2(I2+I3+I4) R3(I3+I4) R4 • I4 ---- ---- ---- V=V1+V2+V3+V4
Extension
stage 5
R1(I1+I2+I3+I4
+I5)
R2(I2+I3+I4+I5) R3(I3+I4+I5) R4(I4+I5) R5 • I5 ---- ---- V=V1+V2+V3+V4+V5
Extension
stage 6
R1(I1+I2+I3+I4
+I5+I6)
R2(I2+I3+I4+I5
+I6)
R3(I3+I4+I5+I6) R4(I4+I5+I6) R5(I5+I6) R6 • I6 ----
V=V1+V2+V3+V4+V5+
V6
Extension
stage 7
R1(I1+I2+I3+I4
+I5+I6+I7)
R2(I2+I3+I4+I5
+I6+I7)
R3(I3+I4+I5+I6
+I7)
R4(I4+I5+I6+I7) R5(I5+I6+I7) R6(I6+I7) R7 • I7
V=V1+V2+V3+V4+V5+
V6+V7
The voltage supplied to "IN" connector of the Q5
B in the final extension reaches 4.75
VDC or higher on the condition that the sum total of voltage drop to "IN" connector of
Q5
B (V) is 0.15V or lower.
(2) When the Q6 B is connected between the Q3 B and the Q5 B
(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).
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
[When the Q5 B is connected to Extension stage 2.]
V
R1
I1
Main base unit (Q3 B)
Extension stage 1
Extension stage 2
Power
supply
module
Extension base unit (Q6 B)
Extension base unit (Q5 B)
Power
supply
module
Symbol Description
V
Voltage drop at the extension cable between the main base unit and extension base unit (Q5
B)
In
5VDC current consumption when the Q5
B is used as Extension n+1, n = 1 to 6, n: Extension No. of Q6
B
connected
(Sum total of current consumed by Q5
B and currents consumed by the I/O, intelligent function modules
loaded on the Q5
B.)
Rn
Extension cable resistance between the main base unit or the extension base unit (Q6
B) and the extension
base unit (Q6
B)
Rn+
1
Extension cable resistance between the extension base unit (Q6
B) and extension base unit (Q5
B)