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5 FUNCTIONS USED WITH SSCNET COMMUNICATION
5.5 Driver Communication Function
When a servo amplifier fails due to a SSCNET(/H) communication failure, communication with the axes
after the failed axis cannot be executed. For this reason, be sure to connect the master axis to the position
closest to the Motion CPU.
Precautions during control
Servo amplifier
• For the axes where driver communication is executed, be sure to use a servo amplifier that supports driver communication.
• Driver communication function is only valid in MR-J3-B and MR-J4-B. MR-J4W-B and MR-J3W-B cannot be used.
Nor can MR-J4W-B be used in MR-J3-B compatibility mode.
• Be sure to connect the master CPU and slave CPU in the same SSCNET(/H) line.
• The master CPU and slave CPU combination is set in the servo parameters. After writing the servo parameters, turn ON
again or reset the Multiple CPU system power supply so that the parameters become valid.
• The differences between SSCNET and SSCNET/H communication type in driver communication function are shown
below.
• If all axes set to driver communication are not detected at the start of communication with the servo amplifier, all axes
connected to that line, including normal axes cannot be operated. (The servo amplifier's LED display remains "Ab"). Check
with the following "SSCNET searching flag (Line 1) (SM532)"/"SSCNET searching flag (Line 2) (SM533)" if a SSCNET
line can be operated. When all normal axes and axes set to driver communication are connected, the "SSCNET
searching flag (Line 1) (SM532)"/"SSCNET searching flag (Line 2) (SM533)" turn OFF.
CAUTION
• During operation by driver communication function, the positioning control or JOG operation, etc. by servo program is not interrupted even if a servo error
occurs in the slave axis. Be sure to stop the master axis by user program.
Communication type
SSCNETIII SSCNETIII/H
Communication with servo amplifiers
after Multiple CPU system power
supply ON.
Servo amplifiers cannot be operated until connection with
all axes set by system setting is confirmed.
Servo amplifier cannot be operated until connection with
all axes set to driver communication is confirmed.
Normal axes (axes not set to driver communication) can
also be connected after the network is established.
Connect/disconnect with servo
amplifier
Only the first axis of the SSCNET line (servo amplifier
connected directly to the Motion CPU) can connect/
disconnect.
Servo amplifiers other than the first axis can be
disconnected but cannot be connected.
Only the first axis of the SSCNET line (servo amplifier
connected directly to the Motion CPU) can connect/
disconnect. Only normal axes (axes not set to driver
communication) other than the first axis can be connected
when they are disconnected. However, when axes set to
driver communication are disconnected, they cannot
communicate with servo amplifiers that were connected
after disconnecting. (The servo amplifier's LED display
remains "AA")
Device No. Name Details Set by
SM532 SSCNET searching flag
(Line 1)
• Turns ON when searching axes that have been set by system
setting in line 1 or line 2.
• Turns OFF when all axes that have been set by system setting in
line 1 or line 2 have been searched.
OFF: Search complete
ON: Searching
S (Change status)
SM533 SSCNET searching flag
(Line 2)
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