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Communication extension card
-30-
Asynchronous triggering (254): When the value of the event timer is not zero, a slave station transmits PDO
Tx commands periodically. For example, if the event timer of PDO2 Tx is set to 200, the slave station
transmits a PDO2 Tx command at the interval of 200 ms. When the value of the event timer is zero, the slave
station transmits a PDO Tx command once the corresponding PDO Tx data changes, and the transmission
interval is subject to the disabled time. A PDO Tx packet can be transmitted only once in the disabled time,
which effectively reduces the load of the bus. When the disabled time is set to a period shorter than 50 ms,
50 ms is used as the disabled time.
Asynchronous triggering (255): When the value of the event timer is not zero, a slave station transmits PDO
Tx commands periodically. For example, if the event timer of PDO2 Tx is set to 200, the slave station
transmits a PDO2 Tx command at the interval of 200 ms. When the value of the event timer is zero, the slave
station transmits a PDO Tx command once a corresponding PDO Rx command is received. For example, after
receiving a PDO2 Rx command, the slave station transmits a PDO2 Tx command.
Table 3-11 Triggering modes supported by the communication card
Triggering
mode
Transmission
type
(decimal)
Event
triggering
PDO1 TX
PDO2
TX
PDO3
TX
PDO4
TX
Synchronou
s
1
–
240
/
Non-
supported
Support
ed
Support
ed
Support
ed
Asynchrono
us
254
Event
timer
Non-
supported
Support
ed
Support
ed
Support
ed
Disabled
time
Non-
supported
Support
ed
Support
ed
Support
ed
255
Event
timer=0
Supported
Support
ed
Support
ed
Support
ed
Event
timer=0
Non-
supported
Support
ed
Support
ed
Support
ed
Table 3-12 Default PDO Tx settings of the communication card
PDO1 TX
PDO2 TX
PDO3 TX
PDO4 TX
Transmission
type
255
254
254
254
Event timer (ms)
0
0
0
0
Disabled time
(ms)
500
500
500
500
For how to set the triggering type of PDO Tx, see the description of SDO commands.
3.5.2
PDO1
PDO1 is used to read and write parameters of the VFD. The function of PDO1 is similar to that of an SDO.
SDOs are used to read and write objects of an object dictionary, and PDO1 is used to read and write
parameters of the VFD.
Note:
PDO1 Tx support only the transmission type of asynchronous transmission 255. Do not set it to other
transmission types, and do not try to set the event timer to periodically transmits PDO1 Tx to the master