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EtherCAT watchdog timeout issue

Hi,

We have the log when use TwinCAT to connect the EtherCAT Slave which is based on AM3359x

Type    Server (Port)    Timestamp    Message
Hint     (65535)    2013/9/3 上午 10:16:32 620 ms    'Box 1 (XXX)' (1001): state change to 'OP' finished
Error     (65535)    2013/9/3 上午 10:16:32 604 ms    'Box 1 (XXX)' (1001): abnormal state change (from 'OP' to 'SAFEOP') with code 0x1b, 'Sync manager watchdog'. Try to go back to 'OP'...

What reason will cause the Sync manager watchdog?