Remote I/O (input/output) control system of Modbus fieldbus DI-16-route monitor

Abstract

The invention discloses a remote I / O (input / output) control system of a Modbus fieldbus DI-16-route monitor, which is characterized in that a process of carrying out message transmission (which is implemented by using a fieldbus in an RTU (remote terminal unit) mode of a Modbus master / slave station protocol) between a master station and a slave station comprises the following steps of: sending a request message frame by a master station (6) U0; reading the request message frame by terminals J1 and U3, a transceiver drive communication circuit (5), a transceiver message control circuit (4) and a slave station (3) U1; acquiring on-off data by a subprogram of the U1; sending response message frames by the terminal J1, an on-off acquisition circuit (1), a photoncoupled isolating circuit (2) and the slave station (3) U1; and reading the response message frames by the transceiver message control circuit (4), the transceiver drive communication circuit (5), the terminal J1 and the master station (6) U0. The DI-16-route monitor is a slave station product for filed on-off acquisition, and provided with a PLC (programmable logical controller) product which is in a structure of integrating a power supply (with a visual diagnosis function and an anti-electromagnetic interference capability), a CPU (central processing unit) and I / O nodes, and compact in appearance, and easy to install, wiring and debug.

Description

Technical field: [0001] The invention relates to a remote I / O control system for a Modbus field bus DI-16 monitor, which belongs to the field bus technology and programmable controller PLC technology; in particular, it belongs to the Modbus field bus control technology integrated with the field bus and PLC system. Background technique: [0002] The background technology of the remote I / O control system of the Modbus field bus DI-16 road monitor is as follows: [0003] 1. Modbus communication technology: Based on the national standard GB / T19582.2-2008 on "Modbus protocol industrial automation network specification" as the basis for the preparation of the software and hardware design of the Modbus fieldbus system communication protocol. This specification implements the Modbus protocol of 1 physical layer, 2 serial link layer, and 7 application layer of the ISO model of the International Organization for Standardization. The serial link protocol is a master-slave protocol, an...

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Problems solved by technology

[0029]Currently, the domestic fieldbus control system basically uses a complete set of imported software and hardware. Able to operate, if there is a general problem, parts will be replaced. After the new system has been running for about a few years, the technical service cannot keep up. The control system may have partial or most automation systems that cannot be used. It can only be operated manually, resulting in low output and poor quality. The consequences of high costs and no guarantee of safe operation have caused huge economic losses to the country and enterprises

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