A redundant on-site bus I/O control device

Abstract

The invention discloses a redundant on-site bus I / O control device comprising a control mainboard, a display control panel, a power supply terminal, a switching value incoming signal terminal, a switching value output signal terminal and communication terminals. The control mainboard comprises a central processor, a storage, a power supply interface, an input interface, an output interface, two DP slave station controllers, two optoelectronic isolation circuits and two transmit-receive circuits. The display mainboard comprises a button set, a display screen and an indicating lamp set. In the invention, two DP slave station interfaces are respectively controlled by the DP slave station controllers corresponding to the DP slave station interfaces, and can respectively carry out complete data communication with a main station. When the control device is electrified, a power indication lamp shows the electrification. Through two indicating lamps, states of two DP networks are displayed. Through a display screen, measurement and configuration data are displayed. The communication terminals allows two modes which are a pluggable terminal and a DB9 socket to be employed. The wiring mode is selectable. The redundant on-site bus I / O control device of the invention is simple in structure, low in cost, high in communication rate and is reliable and stable. Usage of cables is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of field bus I / O control, in particular to a redundant field bus I / O control device. Background technique [0002] The current field electric equipment such as doors, valves and other bus control systems basically use imported electric doors with DP slave interface, which is not only expensive and the interface is not redundant, but also has problems in spare parts and equipment maintenance. For the control of domestic electric doors, valves, etc., most of them are still implemented by hard wiring with the distributed control system (Distributed Control System, DCS) system, and the corresponding field devices cannot be directly controlled. PROFIBUS-DP bus is one of the international standards for fieldbus, and it is also the first national fieldbus standard in my country. It consists of three compatible parts: PROFIBUS-DP, ROFIBUS-PA, PROFIBUS-FMS, among which DP is DecentralizedPeriphery-dispersed periphera...

AI Technical Summary

Problems solved by technology

However, the existing fieldbus I / O (input / output) modules also have the following deficiencies: 1. There is no redundant interface, and what is provided is a single interface. Once the interface, master station or bus cable is abnormal, normal communication will not be possible. ; 2. It is impossible to set the relevant parameters of the module on site and check the communication status and I / O status of the module; 3. It is not possible to set parameters on site, operate the test on site, and the relay output of the module and the action of the load equipment, etc. Situation test; 4. The DP slave station module is connected to the outside world in the form of a DB9 socket. The external communication bus must be connected to the module through a T-shaped bus connector. The method is fixed, which is inconvenient for on-site installation and wiring; 5. I The on-site application environment of the / O module is relatively harsh, and there may be strong interference sources such as high-power electrical equipment and inverters, and the cable bridge that the communication line passes may contain various on-site interference, and the anti-interference facilities are not comprehensive, which affects the normal operation of the module 6. Poor reliability, low communication rate, complicated field cables, and poor application effect

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