According to
http://www.omron-healthcare.com/data/catalog/3/188/1/IM-HEM-6000-E-01-08-08-EN.pdf it means you have the device in the correct position and it is starting to take a measurement - you should leave it until it completes. I am unsure if this is the correct model however:
"If your wrist is too low or too high, the position sensor alarm will emit a series of two short bleeps similar to a heartbeat.
When your wrist is at the correct position, the heart symbol
starts to blink and longer beep tones are emitted.
Sit still and do not talk or move until the measurement is
completed.
Keep the monitor at heart height until the measurement is
completed.
To stop measurement, press the O/I START button at any
time during measurement."
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