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Relay extender for network bus

A network bus and extender technology, applied in the direction of instruments, electrical digital data processing, etc., can solve the problems that formal products have not yet appeared in the market, blockade, etc., and achieve the effects of excellent functions, simple hardware design, and obvious economic benefits.

Active Publication Date: 2008-06-11
SHANGHAI ELECTRICAL APPLIANCES RES INSTGROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these products are still in the research and testing stage abroad, and the official products have not yet appeared in the market, and they are in a state of technical blockade in China

Method used

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  • Relay extender for network bus
  • Relay extender for network bus
  • Relay extender for network bus

Examples

Experimental program
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Embodiment Construction

[0019] As shown in Figure 1, the DeviceNet network extender includes a main CPU unit 1, a status indication unit 2, a main power circuit 3, A channel signal processing 4, B channel signal processing 5, auxiliary power supply and photoelectric isolation circuit 6. The data transmission between the above circuits is carried out with the main CPU unit as the center.

[0020] The DeviceNet network transmits the signal from the A port to the DeviceNet network sequentially through the A channel signal processing 4, the main CPU unit 1, the B channel signal processing 5, and the B port; and vice versa.

[0021] The main CPU unit 1, the selected SST89E554RC2 is frequency division mode, ISP download, 1K storage RAM. Because the main CPU has a faster processing speed and a large cache, and is conducive to upgrading needs.

[0022] As shown in Figure 2, it is a specific circuit schematic diagram of the block diagram in Figure 1.

[0023] The network extender needs to solve the transmis...

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Abstract

The extender for prolonging network bus includes main CPU unit, state indication unit, main power source loop, signal processing channel A, signal processing channel B, auxiliary power source and photoelectronic isolating loop. The circuits have the data transmission in the following order: data in the DeviceNet section A is transmitted to DeviceNet section B through port A, signal processing channel A, main CPU unit, signal processing channel B and port B; or vice versa. The present invention realizes the transparent data transmission between different network section. For increased network length and shortened delay time, the CPU has stored automatic baud rate detecting flow chart, signal sending flow chart, signal receiving flow chart and interruption flow chart, and the constituted software and hardware are combined for successful network extending.

Description

Technical field: [0001] The invention relates to a relay extender for DeviceNet bus, more precisely to a device for relay extension of an open field bus protocol based on CAN bus. Background technique: [0002] DeviceNet is an open fieldbus protocol based on CAN bus. According to the baud rate / network distance relationship stipulated by DeviceNet, the longest transmission distance is 500M at the lowest baud rate of 125kbps. This distance can meet the general equipment level control system. , but in some special occasions such as water treatment, remote monitoring, etc., the 500M distance is not enough, and the network extension solution must be adopted. [0003] At present, the network relay extension of DeviceNet bus at home and abroad adopts the following three schemes. [0004] 1. Directly amplify the CAN signal relay. It is to install two signal repeaters composed of CAN transceiver chips at the relay point of the DeviceNet network. After the CAN signal is simply "rece...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F13/00G06F13/38G06F13/40G06F13/42
Inventor 赵文华鞠磊
Owner SHANGHAI ELECTRICAL APPLIANCES RES INSTGROUP