Mitsubishi Electric Q26UD(E)HCPU User Manual page 218

(b) Methods for reducing voltage drops
The following methods are effective to reduce voltage drops at the extension cables.
1) Changing the module loading positions
Load large current consumption modules on the main base unit.
Load small current consumption modules on the extension base unit (Q5B).
2) Using short extension cables
The shorter the extension cable is, the smaller the resistance and voltage drops will be.
Use the shortest possible extension cables.
(2) When the base unit is Q3
Slim type power supply
module (Q61SP)
Keep the current consumption of the slim type main base unit (Q3SB) not exceeding the 5VDC rated output
current of the slim type power supply module (Q61SP).
(3) When the base unit is Q3
Two redundant power
supply modules
*2 The CPU module is mounted on the main base unit.
216
SB:

5VDC Rated output current
2.0A
RB or Q6

5VDC rated output current
8.5A
Slim type main base unit
(Q32SB, Q33SB, or Q35SB)
Peripheral, converter, cable
CPU module (such
as Q02(H)CPU (for connecting a CPU module
with a personal computer)
and Q06HCPU)
I/O module (such as
QX10 and QY10)
Intelligent function module (such
as Q64AD and QJ71LP21-25)
RB

Redundant power supply base
unit (Q3 RB or Q6 RB)
*2
CPU module (such
Peripheral, converter, cable
as Q02(H)CPU and
(for connecting a CPU module
Q06HCPU)
with a personal computer)
I/O module (such as
QX10 and QY10)
Intelligent function module (such
as Q64AD and QJ71LP21-25)
Type
Q61SP
Type
Q63RP
Q64RPN
Q64RP