YASKAWA GA700 Series Technical Manual page 780

12.7 F: Options
Controller to Communication Option
• The controller and card communicate in the format of
each field bus communications protocol.
• Drive 0 sends commands and monitors through normal
field bus communications.
• The special registers of Drive 0 use read and write to
send commands to and monitor Drives 1 to 4.
Note:
Energize the slave drive before you energize the master drive. If you energize the master drive first, the drive detects CE [Modbus
Communication Error].
Operations at the Time of Communication Error
Error
Communication Error
Codes
From controller to
bUS
communication option
From communication
oFAxx
option to master drive
From master drive to
CE
slave drive
780
Table 12.56 Operation in Gateway Mode
Communication Option to Master Drive (Drive 0)
Field bus communication data is written to and read from
the special registers of Drive 0.
• Master drive
Detects bUS [Option Communication Error] and operates as specified by F6-01 [Communication Error Selection].
• Slave drive
Detects CE [Modbus Communication Error] and operates as specified by H5-04 [Communication Error Stop Method].
Note:
• After error detection, each drive can continue the operation specified by the last received command if the F6-01 and H5-04 settings
agree. Because the controller cannot stop the operation, you must supply a stopping method, for example an emergency stop
switch.
• If you set H5-05 = 0 [Comm Fault Detection Selection = Disabled], the drive will not detect CE. The H5-04 setting does not have
an effect.
• Master drive
Detects oFAxx and coasts to stop.
• Slave drive
Detects hLCE [High Level Communication Errors] and coasts to stop.
The master drive stops communicating with the slave drive in these conditions: Reset the fault to restart communication.
The slave drive detects CE after H5-09 [CE Detection Time] is expired. Then it operates in as specified with H5-04 [Communication
Error Stop Method].
• A message error occurred in the send data from the slave drive 10 consecutive times.
• Response from the slave drive timed out 10 consecutive times.
Master Drive (Drive 0) to Slave Drives (Drives 1 to
• Uses MEMOBUS communications.
• Drive 0 sends data from its special registers to Drives
1 to 4.
Operation
YASKAWA SIEPC71061705H GA700 Series Technical Manual
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