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Method for calculating number of PROFIBUS-PA bus network segment equipment

A calculation method and bus technology, applied in the direction of bus network, digital transmission system, data exchange network, etc., to achieve the effect of high practical application value, reduced design rework and high accuracy

Inactive Publication Date: 2021-01-08
XIAN THERMAL POWER RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As for the specific number of network segment devices, there is currently no quantitative calculation method or formula

Method used

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  • Method for calculating number of PROFIBUS-PA bus network segment equipment
  • Method for calculating number of PROFIBUS-PA bus network segment equipment
  • Method for calculating number of PROFIBUS-PA bus network segment equipment

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Experimental program
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Embodiment

[0105]The PROFIBUS-PA bus network segment in this embodiment includes one PROFIBUS-DPV0 master device node, and it is set that the master station is only connected to one network segment each time. The PA network segment uses a coupler for physical layer conversion. The feed voltage and feed current of the PA coupler are 24V / 1000mA respectively. The baud rate of the PA network segment is 31.25kbit / s, the number of PA slave stations is m, and each slave station has 5 bytes of input data and 5 bytes of output data.

[0106] The bit time is calculated based on the following formula (1):

[0107]

[0108] Synchronization time and transmission delay time are calculated based on the following formula (2):

[0109] T syn =33T bit

[0110] T td =33T bit (2)

[0111] where T syn refers to the synchronization time, T td Refers to the transmission delay time, both of which are 33T bit

[0112] The minimum and maximum values ​​for the slave delay time are determined based o...

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Abstract

The invention discloses a method for calculating the number of PROFIBUS-PA bus network segment equipment. The method comprises the following steps: calculating bit time according to a network segmentbaud rate; calculating synchronization time and transmission delay time according to the bit time; determining the minimum value and the maximum value of the delay time of the slave station; calculating insurance allowance time; obtaining the delay time of the token receiver according to the characteristics of different baud rates; calculating idle time 1 and idle time 2; calculating the idle timeby taking the larger one according to the idle time 1 and the idle time 2; and in combination with the calculation results, calculating information cycle time so as to calculate the number of the PROFIBUS-PA bus network segment devices. According to the calculation method, numerous PPROFIBUS protocol time parameters involved in information cycle time calculation such as bit time Tbit, synchronization time Tsyn, gap time Tid, transmission delay time Ttd and slave station delay time Tsdr are fully considered, and the calculation accuracy is high.

Description

technical field [0001] The invention relates to the technical field of Process Fieldbus-Process Automation (PROFIBUS-PA for short) network communication technology in a power plant, in particular to a method for calculating the number of PROFIBUS-PA bus network segment devices. Background technique [0002] PROFIBUS-PA (Process Automation) conforms to the IEC61158-2 standard and is called intrinsically safe (referred to as intrinsically safe) transmission mode. Its characteristic is that the encoding adopts Manchester (Manchester) method, has a fixed transmission rate of 31.25Kbps, and uses the bus to supply power to each device in the BP (Bus-Power) method. That is to say, in addition to transmitting signals, the two-core cable itself can safely supply power to each connected field device. Therefore, it is widely used in chemical and petroleum industries and other on-site control environments that have explosion-proof requirements for electrical equipment. Compared with t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/26H04L12/40
CPCH04L43/08H04L43/0852H04L12/40H04L2012/40228
Inventor 崔逸群刘超飞王文庆杨新民杨东毕玉冰邓楠轶董夏昕高原英朱博迪介银娟
Owner XIAN THERMAL POWER RES INST CO LTD
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