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| 10/24/2010 4:03 PM | |
Joined: 9/27/2006 Last visit: 3/23/2025 Posts: 12344 Rating:
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Hello hdhosseini; The TBit is a normalized time unit used to calculate the delays and transmission times in a Profibus configuration. See the following description: Definition of bit-time: Bit-Time: To help simplify timing calculations, it is convenient to normalize the time units with respect to the baud rate by using units of Bit-Time (Tbit). One bit-time is the time it takes to transmit one bit and is the reciprocal of the transmission rate (baud rate). For example:1 Tbit (Bit Time) at 12MB = 1/12000000bps = 83ns/bit This is extracted from the attached document from Acromag; the last pages describe Bus Timings in a Profibus-DP network. In a normal Profibus network setup, the Profibus configurator sets the line parameters by itself, and determines how much time is allowed to each slave to repond to the master before diagnostics are called, and how long the Profibus cycle is expected to take. But there are cases where the user has toadjust the cycle parameters himself. Here is an example: Tbitcalculations when using OLMs: http://support.automation.siemens.com/WW/view/en/1995199 Hope this helps, Daniel Chartier Attachmentprofibus_Introduction_698A.pdf (272 Downloads) |
Last edited by: dchartier at: 10/24/2010 4:32 PM |
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