This unit absorbs the regenerative current produced when the motor reduces the speed and emits it as heat. It is necessary when operating a model specified by Yamaha or a load with a large inertia.
Basic specification
Item RGU2 RGU3 RG2
Model KS5-M4107-0A
(Including accessory)
KX0-M4107-10
(Including accessory)
KAS-M4130-00
(Including accessory)
Dimensions W40 × H250 × D157mm W52 × H250 × D242.5mm W30 x H210 x D158mm
Weight 0.9kg 3.7kg -
Regenerative voltage Approx. 380V or more Approx. 420V or more
Regenerative stop voltage Approx. 360V or less Approx. 380V or less
Accessory Cable for connection with controller (300mm)
Note : Use RGU3 for YK550X / YK500XG / YK600XG.

All operation including editing, teaching, etc. can be handled by this compact size programming unit with a 40characters x 8lines large size LCD.
Note : Use RPB / RPB-E for RCX221 / RCX222.
Note : RPB-E is a programming unit usable for CE.
Note : For details on SEL connection for RPB-E, Click here.

Basic specification
Item MPB MPB-E2 RPB RPB-E
Model KB9-M5110-12 KS9-M5110-10 KBK-M5110-10 KBK-M5110-00
Display LCD (40characters x 8 lines)
Emergency stop switch With mushroom-type lock, contact B
Enabling switch - 3-position - 3-position
Serial interface RS-422 : 1CH, dedicated to communication with controllers
Operating temperature/ Operating humidity 0 to 40 / 35% to 80% RH (non-condensing)
Dimensions W189 × H241 × D29mm W188 × H261 × D34mm W180 x H250 x D50mm
(Note : Projection of emergency stop button is not included.)
Weight 700g 1,200g 600g
Cable length 5m 5m,12m (option)


These batteries are for backing up the absolute data. The data retention time has been increased to 1 Year.
Basic specification
Item For RCX240 Battery For RCX222 Battery
Model KBG-M4252-00
Battery type Lithium battery
Battery capacity
Back up time (Note 1)
3.6V/2,700mAh
1 year (Note 3)
Dimensions φ17 x L53mm
Weight 22g (Note 4)
Note 1 : When power is turned OFF with fully charged battery mounted.
Note 2 : A double capacity type whose data retention time is 1360 hours is also available.
Note 3 : When using 2 batteries.
Note 4 : Weight of battery itself.


This module increases to the maximum of 112/72 general-purpose input/output.

Item Standard I/O board Number of extension I/O board General use DIO
N, P (Note 1)
- 16/8 points
N1, P1
1 piece 40/24 points
N2, P2
2 pieces 64/40 points
N3, P3
3 pieces 88/56 points
N4, P4
4 pieces 112/72 points
Note 1 : Use N to N4 when NPN is selected on the I/O board, and P to P4 when PNP is selected.
Note : It is expandable to the maximum of 4 modules. 3 modules maximum when a field network module is provided.



Option modules that enable connection of the RCX221 / 222 / 240 as remote device station of field network systems.
Select three types which allow wiring to be reduced such as CC-Link, DeviceNet, and Profibus.
For easy connection to PC network, Ethernet module can also be added.


An application software that enable PC to operate RCX221 / 222 / 240.

Model KR4-M4966-00


Communication cable to connect PC and a controller.

Model (SSC-1-3L) KR7-M538F-10
Model (SSC-1-5L) KR7-M538F-30
Note : The photo shows SSC-1-3L.


An adapter converting D-sub 25pins(male) to D-sub 9pins(male). It is required when connecting controller with supporting software.

Model KAX-M657E-01
Note : This is not a conversion adaptor for HPB. Its misuse may break the controller.