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SI-EtherCAT User Guide
Issue Number: 2
6.5
Cyclic data loss behaviour
Table 6-29 Cyclic data loss behaviour
0x3005
Cyclic data loss behaviour
Sub-index 0
Access: RO
Range: N/A
Size: 1 byte
Unit: N/A
Default: 2
Type:
USINT
Description:
The number of the last sub-index in this object.
Sub-index 1
Access: RW
Range: 0 to 65535
Size: 2 byte
Unit: ms
Default: 0
Type:
UINT
Description:
The maximum time, in ms, allowed between accesses to synchronous PDOs (read or writes).
If no PDO access occurs for this period, the option will start cyclic data loss handling. If a
value of zero is set, no cyclic data loss handling will occur.
When used in modes that provide interpolation, thus having a mode-specific cycle time, the
loss must be for the duration of (maximum time) cycle. The maximum time will be aligned to
the start of a cycle.
So for a position cycle time of 4 ms and a maximum time configuration of 6 ms, this would
result in a loss detection of 2 cycles or 8 ms of PDO’s.The time will always be rounded up to
the next cycle. If the maximum time is configured to less than the cycle time then this will be
rounded up to the cycle time.
For a time of 0 ms the cyclic data loss detection will not trigger for any loss.
Sub-index 2
Access: RW
Range: 0 to 2
Size: 1 byte
Unit: N/A
Default: 0
Type:
USINT
Description:
Cyclic Data Loss Action; the value will select an action as follows:
0: a trip will never occur; however, a cyclic data loss will still be handled by initiating a motor
stop according to the Fault reaction option code and indicating a alarm as previously
described.
1:The cyclic data loss trip will occur only after the motor has been stopped according to the
Fault reaction option code; in so far as the motor stop can actually be detected, depending on
the feedback actually in use, if any.
2: A trip will occur immediately on cyclic data loss (this implies that the motor will coast; no
other motor stop will be initiated).
Sub-index 3
Access: RW
Range: 0 to 65535
Size: 1 byte
Unit: N/A
Default: 0
Type:
UINT
Description:
Cyclic loss counter
Provides an indication of the number of PDO’s lost.
The counter is reset when the EtherCAT network is restarted.
In the event of the cyclic data not being detected within the synchronisation cycle the
drive will indicate a 'PDOs Lost' alarm.
NOTE
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