Справочник Пользователя для Mitsubishi Electronics Q25HCPU

 

 

 

6 - 8                                                                                                                                                       6 - 8 

MELSEC-Q

 

6   BASE UNIT AND EXTENSION CABLE 

 

6.6 Guideline for Use of Extension Base Units (Q5

†B) 

Since the Q5

†B is supplied with 5VDC from the power supply module on the main 

base unit, a voltage drop occurs at extension cables. 

Improper I/O may be provided if the specified voltage (4.75VDC or higher) is not 

supplied to the "IN" connector of the Q5

†B. 

When using the Q5

†B, make sure that the "IN" connector of the Q5†B is supplied 

with 4.75VDC or higher. 
 
And it is recommend to connect it with the shortest possible extension cable right after 

connecting the main base unit, so as to minimize the effects of voltage drop. 
 

(1) When only the Q5

†B is connected to the extension base unit 

(a) Selection condition 

4.75VDC or higher should be supplied to the "IN" connector of the Q5

†B in 

the final extension stage. 

(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 

V1

V2

R7

R1

R2

R7

Power 
supply
module

Extension stage 1

Extension stage 2

Extension stage 7

Main base unit (Q3   B)

Extension base unit (Q5   B)

Extension base unit (Q5   B)

Extension base unit (Q5   B)

l1

l2

l7

 

 

 

Symbol Description 

V1 

Voltage drop at the extension cable between the main base unit and extension base unit 

Vn 

Voltage drop at the extension cable between the extension base unit (extension stage n-1) and extension base 

unit (extension stage n) 

R1 

Cable resistance between the main base unit and extension base unit 

Rn 

Cable resistance between the extension base unit (extension stage n-1) and extension base unit (extension 

stage n)  

l1 to l7 

5VDC current consumption among extension stage 1 to 7  1 

1: Sum total of current consumed by Q5

†B and currents consumed by the I/O, intelligent function modules loaded on the 

Q5

†B. 

The symbols including "I" (I1 to I7) vary with the modules loaded on the extension base unit. For details of the symbol, 

refer to the user's manuals of the module used.