Programmable logic controller (PLC) communication method of gantry crane of decentralized periphery (DP) bus framework
A portal crane and communication method technology, applied in the directions of load hanging components, transportation and packaging, etc., can solve the problems of inconvenient construction and wiring, restricting the application of field bus communication technology, and DP bus cannot be transmitted through ordinary slip rings. , to achieve the effect of reducing engineering wiring costs, simple structure and high reliability
Inactive Publication Date: 2013-05-01
ZHONGCHUAN NO 9 DESIGN & RES INST
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Problems solved by technology
However, DP communication has specific requirements for cable lines, and DP bus cannot be transmitted through ordinary slip rings.
With the increase of signal points, the number of cables used to connect the control cabinet of the cart and the PLC of the electrical room also increases, and the construction wiring is very inconvenient. Pedestal cranes cannot use DP bus communication and need to use vulnerable or high-cost wireless communication and other special communication devices
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[0010] See attached figure 1 , between the PLC master station 2 of the present invention and the PLC substation 6, a slip ring 4 is used to connect the DP field bus to form a PLC communication network between the upper electrical room 1 of the portal crane and the lower cart machine room 7; the PLC master station 2 It is installed in the upper electrical room 1, and its CPU is externally connected to the main station guide rail signal amplifier 3; the PLC substation 6 is installed in the lower cart machine room 7, and its CPU is externally connected to the substation guide rail signal amplifier 5; the slip ring 4 is two-way control The upper and lower ends of the sliding connector are respectively connected to the guide rail signal amplifier 3 of the master station and the guide rail signal amplifier 5 of the substation. When the upper electrical room 1 rotates horizontally, the slip ring 4 is connected to the DP field bus to connect the PLC master station 2 The control signal...
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The invention discloses a programmable logic controller (PLC) communication method of a gantry crane of a decentralized periphery (DP) bus framework. The PLC communication method the gantry crane of the DP bus framework is characterized in that a DP field bus is connected by slip rings between a PLC master station and a PLC substation of a PLC control system of the crane to form a PLC communication network; when an upper electrical room horizontally rotates, a control signal of the PLC master station is transmitted to the PLC substation by the DP field bus connected by the slip rings to realize PLC communication between the upper electrical room and a lower crane machine room of the gantry crane in the manner that the DP field bus is connected by the slip rings. Compared with the prior art, the PLC communication method of the gantry crane of the DP bus framework is simple in structure, high in compatibility and high in reliability. Control cables and control slip rings are effectively reduced, the engineering cabling cost is reduced, and further, the control level of the crane is improved.
Description
technical field [0001] The invention relates to the technical field of industrial automation control, in particular to a PLC communication method for a portal crane with a DP bus framework. Background technique [0002] Shipbuilding portal cranes are important production equipment in shipyards. With the development of industrial automation technology, modern control equipment such as frequency converters and PLCs gradually replace traditional relay control circuits. PLCs use field buses, such as PROFIBUS-DP communication (hereinafter referred to as DP communication) has become a technology trend. [0003] Since there are slip rings for rotating power supply in the structure of shipbuilding portal cranes, and there are many motors in the traveling mechanism, control signals such as brakes and motors need to enter the PLC input point for control. In the machine room, the upper and lower control lines of the slip ring need to be connected through the slip ring, so the switchin...
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IPC IPC(8): B66C13/48
Inventor 熊冠楚吴艳青
Owner ZHONGCHUAN NO 9 DESIGN & RES INST