Yaskawa VS-616G5 Modbus Plus Communication Card - Manual (Page 42)

8-2 Diagnostics and Troubleshooting
Troubleshooting Information
If the “Cable Loss” is enabled and a situation causing a cable loss occurs, the drive will generate a
cable loss fault. This fault will be displayed on the Digital Operator as ‘ EF0 - External Flt ’. This ‘
EF0 ’ fault can be cleared by pressing the RESET key on the keypad, only if the cable loss
condition no longer exists.
Diagnostic LED (D2)
The green diagnostic LED on the MB+ board is not visible with the drive cover in place. This
LED’s output is controlled by the on-board peer processor and displays node status by flashing
repetitive patterns. The following is a listing of the LED flashing patterns, and an explanation of
each.
STATUS
Blink Pattern Timing Status
Green Continuous
Slow
Blinks
ON
OFF 340 msec
640 msec This node is off-line and is not allowed to transmit
data across the link. It does hear all other active
nodes on the link, and builds an active node table.
Green Continuous
Rapid
Blinks
ON
OFF 80 msec
80 msec This Modbus Plus node is operating normally. It is
successfully receiving and passing the token.
Green Two
Rapid
Blinks
ON
OFF 160 msec
160 msec This MB+ node is permanently in the idle state. It
is monitoring other nodes on the Modbus Plus link
pass the token, but the token is never passed to
this node. This node may have a bad transmitter.
Green Three
Rapid
Blinks ON
OFF 160 msec
160 msec This Modbus Plus node is not finding any other
nodes on the Modbus Plus link. It is claiming and
winning the token, but has no other node to pass it
to. This node can periodically disrupt
communication on the link. This condition can
indicate a problem with the communication wiring.
Green Four
Rapid
Blinks
ON
OFF 160 msec
160 msec This Modbus Plus node has found another node
on the Modbus Plus link which has an identical
node address. This node will remain off-line,
monitoring the Modbus Plus link until the duplicate
node is not heard from for 5 seconds.