Mitsubishi Electric Melservo MR-J3-100B, Handbook

Page: 310 / 590

Part 6: Common Reference Material
6 - 33
1.4 Comparison of Networks
MR-J4-_B_servo amplifier is connected to controllers, including a servo system controller, on the high-speed
synchronous network SSCNET III/H. The servo amplifier directly receives a command from a controller to
drive a servo motor.
SSCNET III/H allows higher-speed communication of 150 Mbps for both upstream and downstream traffic to
be achieved with high noise resistance enabled by adoption of the SSCNET III optical cables. Large
amounts of data are exchanged in real-time between the controller and the servo amplifier. Servo monitor
information is stored in the upper information system and is used for control.
1.4.1 Comparison of servo system network specifications
Item
MR-J3/MR-J3W series
→
MR-J4 series (Note)
SSCNET III SSCNET III SSCNET III/H
Communication
media
Optical fiber cable Optical fiber cable
Communication
speed
50 Mbps 50 Mbps 150 Mbps
Transmission
distance
[Standard cord inside cabinet/
standard cable outside cabinet]
Maximum distance between stations: 20 m
[Standard cord inside cabinet/
standard cable outside cabinet]
Maximum distance between stations: 20 m
[Long distance cable]
Maximum distance between stations: 50 m
[Long distance cable]
Maximum distance
between stations: 50 m
[Long distance cable]
Maximum distance
between stations: 100 m
Note. When you connect an amplifier with SSCNET III/H communication for the first controller communication with the factory
setting, the operation mode will be fixed to "J4 mode". For SSCNET III communication, the operation mode will be fixed to "J3
compatibility mode". To return to the factory setting or to select an arbitrary mode, change the setting with the application "MR-
J4 (W)-B mode selection".
The application "MR-J4 (W)-B mode selection" is available with MR Configurator2 Version 1.12N and later. When a version
older than 1.12N is used, download an update version from the MITSUBISHI ELECTRIC FA Global Website.
(1) Explanation of SSCNET III/H cable models
Function Name
J4 series
MR-J3/MR-J3W
series
J4 mode J3 compatibility mode
SSCNET III/H communication
or SSCNET III communication
Communication baud rate 150 Mbps 50 Mbps 50 Mbps
Maximum distance
between stations
100 m 50 m 50 m
Note. For cable of 30 m or shorter, contact your local sales office.
Contact Mitsubishi Electric System & Service about ultra-high flex-life cables and long distance cables longer than 50 m.