Mitsubishi Electric MELCEC Q Series User Manual page 104

6. BASE UNIT AND EXTENSION CABLE
(2)
[When the QA1S5 B is connected to Extension 2.]
Main base unit
Power
supply
module
Extension base unit (QA1S6
R1
Power
supply
module
V
Extension base unit (QA1S5
R2
I1
Symbol
V
Voltage drop at the extension cable between the main base unit and extension base unit (QA1S5 B)
5VDC current consumption when the extension base unit (QA1S5 B) is used as Extension n+1,
n = 1 to 6, n: Extension number of extension base unit (QA1S6 B) connected
In
(Sum total of current consumed by QA1S5B and currents consumed by the I/O, special function modules
loaded on the QA1S5 B.)
Extension cable resistance between the main base unit and the extension base unit (QA1S6 B) or the
Rn
extension base unit (QA1S6 B) and the extension base unit (QA1S6 B)
Rn+1
Extension cable resistance between the extension base unit (QA1S6 B) and extension base unit (QA1S5 B)
Position of extension base unit
QA1S6 B
Extension1
Extension 1, Extension 2 Extension 3
Extension 1 to 3
Extension 1 to 4
Extension 1 to 5
Extension 1 to 6
The voltage supplied to the "IN" connector of the QA1S5 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 QA1S5 B is 0.15 VDC or lower.
When the QA1S6 B is connected between the main base unit and the QA1S5 B
(a) Selection condition
4.75VDC or higher should be supplied to the "IN" connector of the QA1S5 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 QA1S5 B can be used if the voltage drop is 0.15VDC or lower
(4.9VDC - 4.75VDC = 0.15VDC)
B)
Extension
stage 1
B)
Extension
stage 2
QA1S5 B
Extension 2
Extension 4
Extension 5
Extension 6
Extension 7
Extension cable type
QC05B
QC06B
QC12B
QC30B
QC50B
QC100B
Description
Voltage drop caused by extension cable from the
main base unit to the QA1S5 B IN connector (V)
V=(R1+R2)I1
V=(R1+R2+R3)I2
V=(R1+R2+R3+R4)I3
V=(R1+R2+R3+R4+R5)I4
V=(R1+R2+R3+R4+R5+R6)I5
V=(R1+R2+R3+R4+R5+R6+R7)I6
6 - 8
Extension cable conductor
resistance
0.044
0.051
0.082
0.172
0.273
0.530