6 BASE UNIT AND EXTENSION CABLE

MELSEC-Q

R1

I2

List for Calculating Voltage Drops Occurring at Extension Cables when connecting Q6†B between Q3†B and Q5†B

Position of extension base unit

Voltage drop caused by extension

cable from the main base unit to the

Q6†B

Q5†B

Q5†B IN connector (V)

Extension stage 1

Extension stage 2

V=(R1+R2)I1

Extension stage 1,

Extension stage 3

V=(R1+R2+R3)I1

Extension stage 2

 

 

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).

 

Main base unit (Q3 B)

Extension Cable

Extension Cable

Power

 

 

 

 

 

 

Conductor

supply

 

 

 

Type

module

 

 

 

Resistance ( )

 

Extension base unit (Q5 B)

QC05B

0.044

 

I1

 

 

 

QC06B

0.051

 

 

 

 

QC12B

0.082

 

 

 

 

 

 

GOT

 

 

 

QC30B

0.172

 

 

 

QC50B

0.273

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

QC100B

0.530

 

 

 

 

 

Number of GOTs connected : Max. 5 units

 

 

GOT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Symbol

Description

VVoltage drop at the extension cable between the main base unit and extension base unit (Q5†B)

5VDC current consumption when the Q5†B is used as Extension n+1, n = 1 to 5, n: Extension No. of the

In

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 254mA)

Im

• 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)

6 - 10

6 - 10