The Studying of Virtual Token Passing Approach in ControlNet |
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| Authors: | Sun Fanjin Tong Weiming Cheng Shukang |
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| Institution: | Rockwell Automation Lab, Harbin Institute of Technology, Harbin 150001, P.R.China;Rockwell Automation Lab, Harbin Institute of Technology, Harbin 150001, P.R.China;Rockwell Automation Lab, Harbin Institute of Technology, Harbin 150001, P.R.China |
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| Abstract: | MAC protocol of ControlNet uses Virtual Token Passing (VTP) to solve the medium access contention, to assure the deterministic and repeatability of message transmission. This paper presents the basic method that VTP uses to transmit real time I/O message, explicit message and maintenance message in scheduled part, unscheduled part and guardband part respectively. On the basis of analyzing the factors of message transmission delay, the maximum message transmission delay in scheduled part is studied, and the result shows it can be determined, so the deterministic and repeatability of message transmission in ControlNet is validated. |
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| Keywords: | MAC VTP deterministic repeatability |
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