Yaskawa VS-616G5 Modbus Plus Communication Card - Manual (Page 20)

Establishing Communications 4-3
Communication Initialization
When input power is applied to the drive, it will recognize the presence of the MB+ board, and
prepare for serial communications.
The green LED indicator (D2) on the MB+ board is used to indicate the MB+ board has
established communications with a PLC. The green LED will react as follows:
Rapid Blink rate = This node is operating normally. It is successfully receiving
and passing the token.
(Additional blink patterns shown in Chapter 8, Diagnostics and Troubleshooting.)
Communication Error Detection
If a communication fault occurs, control from the PLC is not possible. The VS-616G5 drive will
display an “EF0 - DDS External Flt” fault and will then operate according the settings of
parameters F9-02 and F9-03.
The flashing patterns of LED D2 on the MB+ board are described in Chapter 8 of this manual.
F9-02 Drive Detection of “EF0” Fault
0 Fault always detected
1 Fault detected during run
F9-03 Drive Reaction to Communication Error Detection
0 “EF0” is displayed on the Digital Operator, the fault contact closes, and the drive
decelerates the motor to ramp to a stop.
1 “EF0” is displayed on the Digital Operator, the fault contact closes, and the
motor coasts to stop (not controlled by the drive).
2 “EF0” is displayed on the Digital Operator, the fault contact closes, and the drive
does a fast stop.
3 “EF0” is displayed on the Digital Operator. The fault contact does not close, and
the drive continues to run at its last state. (Alarm Only)