Method for transmitting data between a control unit and a plurality of remote I/O units of an automated installation
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United States of America Patent
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Apr 17, 2012
Grant Date -
Feb 24, 2011
app pub date -
May 27, 2010
filing date -
Nov 27, 2007
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A control unit sends a plurality of request messages to the I/O units. The I/O units send a plurality of response messages to the control unit. The request messages and response messages are sent using radio-frequency signals. The I/O units expect to receive a request message within defined first time intervals, and the control unit expects to receive at least one response message within defined second time intervals. The control unit and the I/O units maintain a selected transmission frequency for as long as the request messages and response messages are received within the defined time intervals. The control unit and the I/O units change the transmission frequencies according to a defined pattern if no expected message is received within the defined time intervals.
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