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CHAPTER2 PROFIBUS Unit
2-15 Troubleshooting
Check the following items if any problems occur during operation. Also, refer to “Trouble-
shooting” in the controller instruction manual and always refer to the section on trouble-
shooting in the master station sequencer (PLC) instruction manual. If the following items
do not eliminate the problem, promptly contact your Yamaha dealer or Yamaha for assis-
tance.
Checkpoints
• Check if PROFIBUS cable is not
connected, is miswired, or wires are
broken.
• Refer to “2-5-1 Validating the
PROFIBUS unit”, and check that the
PROFIBUS unit is properly validated.
• Refer to “2-5-2 Setting the station
address” and check the station
address.
• Connect the HPB and check for an
alarm.
• Check if the status LED is lit in red.
• Check the PROFIBUS cable wiring.
• Check the PROFIBUS cable
installation.
• Replace the PROFIBUS unit.
• Check Qn+1.7 status.
• Check if set to emergency stop at HPB
or external parallel I/O.
• Connect the HPB and check the alarm
that was issued.
• Status LED is lit up in red.
Remedy
• Correctly repair any miswirings or
unconnected wiring. Replace the
cable if broken.
• Validate the PROFIBUS unit, and
turn on the controller power again.
• Reset the station address correctly,
and turn on the controller power
again.
• Refer to the controller instruction
manual and troubleshoot according to
the particular alarm.
• Repair the wiring.
• Reinstall the PROFIBUS unit away
from the source of noise
(motor/power lines.)
• If this solves the problem, replace the
PROFIBUS unit.
• To turn on the servo (servo-on) set
Qn+1.7 to ON.
• Cancel emergency stop on the HPB
or external parallel I/O in order to set
the servo to on (servo-on).
• Refer to the controller instruction
manual and troubleshoot per the
particular alarm.
No.
1
2
Causes
PROFIBUS
cable not
correctly
connected.
PROFIBUS unit
is not validated
so cannot be
identified from
controller.
Station address
setting is
incorrect.
Alarm occurring
on controller.
PROFIBUS
cable length does
not meet
specifications for
the PROFIBUS,
or a terminating
resistor is not
connected.
PROFIBUS
cable is in
proximity to a
noise source such
as motor/power
lines.
PROFIBUS unit
is defective.
Set to emergency
stop with Qn+1.7
at OFF.
Set to emergency
stop from HPB
or external
parallel I/O.
Controller alarm
was issued.
1)
2)
3)
4)
5)
6)
7)
1)
2)
3)
Symptom
When using
the master
station
sequencer
line test
function,
unable to
verify from
the master
station
sequencer
(PLC), that
the robot
controller is
correctly
connected to
the
PROFIBUS
system.
Servo won’t
turn on.
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