5 - 4 5 - 4
MELSEC-Q
5 PROCEDURES BEFORE SYSTEM OPERATION
(2) Bus Parameter
Usually, the bus parameters need not be changed.
When changing these parameters, understand the PROFIBUS-DP standards
beforehand.
Parameter
Meaning
Range
Remark
Baud rate
Transfer rate
see selection
Must be supported by
all slaves
T_sl
Slot time
1 to 65535 t_bit
Max.Interval to wait for
response
If the time is exceeded,
an error will be
detected
min T_sdr
Min. Station delay of
responder
0 to 65535 t_bit
max T_sdr
Max. Station delay of
responder
0 to 65535 t_bit
T_qui
Quiet time
0 to 255 t_bit
Time needed to switch
the transmission
direction of the
repeater
T = 0, if no repeater
present
T_set
Setup time
1 to 255 t_bit
T_tr
Target rotation time
1 to 1048576 t_bit
GAP factor
Controls the GAP
update time (T_gud)
1 to 100
HSA
Highest station
address
2 to 126
Max.retry limit
Max.number of retries 1 to 8