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Справочник Пользователя для Mitsubishi Electronics Q25HCPU

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MELSEC-Q
 
6   BASE UNIT AND EXTENSION CABLE 
 
List for Calculating Voltage Drops Occurring at Extension Cables when connecting 
Q6
†B between Q3†B and Q5†B 
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 Q5
†B reaches 4.75 VDC or 
higher on the condition that the voltage drop (V) at the extension cable between 
the main base unit and Q5
†B 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 Q5
†B. 
(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 
R1
I1
GOT
GOT
I2
Power 
supply 
module
Extension base unit (Q5   B) 
Number of GOTs connected : Max. 5 units
Main base unit (Q3   B)
 
 
 
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 5, n: Extension No. of the 
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) 
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 (Q6
†B) and extension 
base unit (Q6
†B) 
Rn+
1
 
Extension cable resistance between the  extension base unit (Q6
†B) and extension base unit (Q5†B)